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92 vulnerabilities by fastify
CVE-2026-14198 (GCVE-0-2026-14198)
Vulnerability from nvd – Published: 2026-07-01 11:29 – Updated: 2026-07-01 12:10
VLAI
EPSS
VEX
Title
@fastify/middie vulnerable to authorization bypass via encoded slash in path parameter values
Summary
@fastify/middie versions 9.1.0 through 9.3.2 decode the encoded slash %2F inside path parameter values before matching middleware paths, while Fastify's underlying router preserves the encoding during route lookup. The two layers disagree on the canonical request path, so the middleware fails to match a URL that the route handler does match. When middleware is used for authentication, authorization, rate limiting, or auditing on parameterized paths, an attacker can reach the protected handler by sending a single crafted URL with an encoded slash in the parameter position. The bypass is HTTP method agnostic and requires no authentication or special preconditions. Patches: upgrade to @fastify/middie 9.3.3. Workarounds: avoid parameterized middleware paths for security decisions, or enforce authentication at the route handler or via a Fastify hook that runs after the router has resolved the request.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/middie | @fastify/middie |
Affected:
9.1.0 , < 9.3.3
(semver)
Unaffected: 9.3.3 (semver) |
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CVE-2026-14181 (GCVE-0-2026-14181)
Vulnerability from nvd – Published: 2026-07-01 11:42 – Updated: 2026-07-01 12:05
VLAI
EPSS
VEX
Title
@fastify/middie standalone engine vulnerable to Denial of Service via malformed percent-encoded paths
Summary
@fastify/middie versions 9.1.0 through 9.3.2 fail to guard the URL normalization step used by the standalone engine when incoming request paths contain malformed percent-encoded sequences. Inputs such as an incomplete percent escape or a truncated multibyte sequence cause the underlying decoder to throw synchronously, and the exception escapes the middie normalize step and terminates the Node.js process. The bypass affects applications that call middie.run directly on the standalone engine API, causing an immediate denial of service for all connected clients until restart. Applications using the Fastify plugin path are not affected because Fastifys error handler catches the exception. Patches: upgrade to @fastify/middie 9.3.3. Workarounds: migrate from the standalone engine API to the Fastify plugin path, where the framework error handler catches the exception.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-248 - Uncaught Exception
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/middie | @fastify/middie |
Affected:
9.1.0 , < 9.3.3
(semver)
Unaffected: 9.3.3 (semver) |
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CVE-2026-6556 (GCVE-0-2026-6556)
Vulnerability from nvd – Published: 2026-06-30 12:48 – Updated: 2026-06-30 13:30
VLAI
EPSS
VEX
Title
@fastify/express vulnerable to middleware bypass via non-string mount paths in prefixed plugins
Summary
@fastify/express versions 4.0.6 and earlier only rewrite the plugin prefix for middleware mount paths when the path argument is a string. Non-string mount paths (arrays of paths and regular expressions) are left unprefixed inside prefixed plugin scopes, so middleware registered with those forms does not match the actual prefixed request path. Applications that use path-scoped middleware for authentication, authorization, rate limiting, or auditing on routes inside a prefixed scope can be bypassed by sending a request to the prefixed route, because Fastify still matches the route but the middleware is skipped. Patches: upgrade to @fastify/express 4.0.7. Workarounds: use string mount paths instead of arrays or regular expressions in prefixed plugins, or register one use call per path.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-285 - Improper Authorization
Assigner
References
Impacted products
1 product
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|---|---|---|---|
| @fastify/express | @fastify/express |
Affected:
0 , < 4.0.7
(semver)
Unaffected: 4.0.7 (semver) |
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CVE-2026-7768 (GCVE-0-2026-7768)
Vulnerability from nvd – Published: 2026-05-04 19:14 – Updated: 2026-05-04 19:50
VLAI
EPSS
VEX
Title
@fastify/accepts-serializer vulnerable to Denial of Service via Unbounded Accept Header Cache Growth
Summary
@fastify/accepts-serializer cached serializer-selection results keyed by the request Accept header without a size limit or eviction policy. A remote unauthenticated client could send many distinct but matching Accept header variants to make the cache grow unbounded, eventually exhausting the Node.js heap and crashing the process. Versions <= 6.0.3 are affected. Update to 6.0.4 or later, which bounds the cache via an LRU with a default size of 100 entries, configurable through the new cacheSize plugin option.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/accepts-serializer | @fastify/accepts-serializer |
Affected:
0 , < 6.0.4
(semver)
Unaffected: 6.0.4 (semver) |
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CVE-2026-33804 (GCVE-0-2026-33804)
Vulnerability from nvd – Published: 2026-04-16 13:56 – Updated: 2026-04-16 14:41
VLAI
EPSS
VEX
Title
@fastify/middie vulnerable to middleware bypass via deprecated ignoreDuplicateSlashes option
Summary
@fastify/middie versions 9.3.1 and earlier are vulnerable to middleware bypass when the deprecated Fastify ignoreDuplicateSlashes option is enabled. The middleware path matching logic does not account for duplicate slash normalization performed by Fastify's router, allowing requests with duplicate slashes to bypass middleware authentication and authorization checks. This only affects applications using the deprecated ignoreDuplicateSlashes option. Upgrade to @fastify/middie 9.3.2 to fix this issue. There are no workarounds other than disabling the ignoreDuplicateSlashes option.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/middie | @fastify/middie |
Affected:
0 , < 9.3.2
(semver)
Unaffected: 9.3.2 (semver) |
Credits
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CVE-2026-6410 (GCVE-0-2026-6410)
Vulnerability from nvd – Published: 2026-04-16 13:29 – Updated: 2026-04-16 14:19
VLAI
EPSS
VEX
Title
@fastify/static vulnerable to path traversal in directory listing
Summary
@fastify/static versions 8.0.0 through 9.1.0 allow path traversal when directory listing is enabled via the list option. The dirList.path() function resolves directories outside the configured static root using path.join() without a containment check. A remote unauthenticated attacker can obtain directory listings for arbitrary directories accessible to the Node.js process, disclosing directory and file names. File contents are not disclosed. Upgrade to @fastify/static 9.1.1 to fix this issue. As a workaround, disable directory listing by removing the list option from the plugin configuration.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
1 product
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|---|---|---|---|
| @fastify/static | @fastify/static |
Affected:
8.0.0 , < 9.1.1
(semver)
Unaffected: 9.1.1 (semver) |
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CVE-2026-6270 (GCVE-0-2026-6270)
Vulnerability from nvd – Published: 2026-04-16 13:44 – Updated: 2026-04-16 14:24
VLAI
EPSS
VEX
Title
@fastify/middie vulnerable to middleware authentication bypass in child plugin scopes
Summary
@fastify/middie versions 9.3.1 and earlier do not register inherited middleware directly on child plugin engine instances. When a Fastify application registers authentication middleware in a parent scope and then registers child plugins with @fastify/middie, the child scope does not inherit the parent middleware. This allows unauthenticated requests to reach routes defined in child plugin scopes, bypassing authentication and authorization checks. Upgrade to @fastify/middie 9.3.2 to fix this issue. There are no workarounds.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/middie | @fastify/middie |
Affected:
0 , < 9.3.2
(semver)
Unaffected: 9.3.2 (semver) |
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CVE-2026-6414 (GCVE-0-2026-6414)
Vulnerability from nvd – Published: 2026-04-16 13:09 – Updated: 2026-04-16 13:48
VLAI
EPSS
VEX
Title
@fastify/static vulnerable to route guard bypass via encoded path separators
Summary
@fastify/static versions 8.0.0 through 9.1.0 decode percent-encoded path separators (%2F) before filesystem resolution, while Fastify's router treats them as literal characters. This mismatch allows attackers to bypass route-based middleware or guards that protect files served by @fastify/static. For example, a route guard on a protected path can be circumvented by encoding the path separator in the URL. Upgrade to @fastify/static 9.1.1 to fix this issue. There are no workarounds.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-177 - Improper Handling of URL Encoding (Hex Encoding)
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/static | @fastify/static |
Affected:
8.0.0 , < 9.1.1
(semver)
Unaffected: 9.1.1 (semver) |
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CVE-2026-33805 (GCVE-0-2026-33805)
Vulnerability from nvd – Published: 2026-04-15 10:13 – Updated: 2026-06-30 12:07
VLAI
EPSS
VEX
Title
@fastify/reply-from vulnerable to connection header abuse enabling stripping of proxy-added headers
Summary
@fastify/reply-from v12.6.1 and earlier and @fastify/http-proxy v11.4.3 and earlier process the client's Connection header after the proxy has added its own headers via rewriteRequestHeaders. This allows attackers to retroactively strip proxy-added headers from upstream requests by listing them in the Connection header value. Any header added by the proxy for routing, access control, or security purposes can be selectively removed by a client. @fastify/http-proxy is also affected as it delegates to @fastify/reply-from.
Upgrade to @fastify/reply-from v12.6.2 or @fastify/http-proxy v11.4.4 or later.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/fastify/fastify-reply-from/sec… | |
| https://cna.openjsf.org/security-advisories.html | |
| https://access.redhat.com/security/cve/CVE-2026-33805 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2458651 | issue-trackingx_refsource_REDHAT |
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| https://access.redhat.com/errata/RHSA-2026:10175 | vendor-advisoryx_refsource_REDHAT |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/reply-from | @fastify/reply-from |
Affected:
0 , < 12.6.2
(semver)
Unaffected: 12.6.2 (semver) |
|
| @fastify/reply-from | @fastify/http-proxy |
Affected:
0 , < 11.4.4
(semver)
Unaffected: 11.4.4 (semver) |
|
| Red Hat | Red Hat OpenShift Dev Spaces 3.27 |
cpe:/a:redhat:openshift_devspaces:3.27::el9 |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
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CVE-2026-33808 (GCVE-0-2026-33808)
Vulnerability from nvd – Published: 2026-04-15 09:29 – Updated: 2026-04-15 13:10
VLAI
EPSS
VEX
Title
@fastify/express vulnerable to middleware authentication bypass via URL normalization gaps (duplicate slashes and semicolons)
Summary
Impact@fastify/express v4.0.4 and earlier fails to normalize URLs before passing them to Express middleware when Fastify router normalization options are enabled. This allows complete bypass of path-scoped authentication middleware via duplicate slashes when ignoreDuplicateSlashes is enabled, or via semicolon delimiters when useSemicolonDelimiter is enabled. In both cases, Fastify router normalizes the URL and matches the route, but @fastify/express passes the original un-normalized URL to Express middleware, which fails to match and is skipped. An unauthenticated attacker can access protected routes by manipulating the URL path.
PatchesUpgrade to @fastify/express v4.0.5 or later.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| fastify | @fastify/express |
Affected:
0 , < 4.0.5
(semver)
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CVE-2026-33807 (GCVE-0-2026-33807)
Vulnerability from nvd – Published: 2026-04-15 09:52 – Updated: 2026-04-15 13:09
VLAI
EPSS
VEX
Title
@fastify/express vulnerable to middleware path doubling causing authentication bypass in child plugin scopes
Summary
@fastify/express v4.0.4 and earlier contains a path handling bug in the onRegister function that causes middleware paths to be doubled when inherited by child plugins. When a child plugin is registered with a prefix that matches a middleware path, the middleware path is prefixed a second time, causing it to never match incoming requests. This results in complete bypass of Express middleware security controls, including authentication, authorization, and rate limiting, for all routes defined within affected child plugin scopes. No special configuration or request crafting is required.
Upgrade to @fastify/express v4.0.5 or later.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
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1 product
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| fastify | @fastify/express |
Affected:
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CVE-2026-33806 (GCVE-0-2026-33806)
Vulnerability from nvd – Published: 2026-04-15 00:14 – Updated: 2026-06-30 12:07
VLAI
EPSS
VEX
Title
fastify vulnerable to Body Schema Validation Bypass via Leading Space in Content-Type Header
Summary
Impact:
Fastify applications using schema.body.content for per-content-type body validation can have validation bypassed entirely by prepending a space to the Content-Type header. The body is still parsed correctly but schema validation is skipped.
This is a regression introduced in fastify >= 5.3.2 by the fix for CVE-2025-32442
Patches:
Upgrade to fastify v5.8.5 or later.
Workarounds:
None. Upgrade to the patched version.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/fastify/fastify/security/advis… | |
| https://cna.openjsf.org/security-advisories.html | |
| https://access.redhat.com/security/cve/CVE-2026-33806 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2458596 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| fastify | fastify |
Affected:
5.3.2 , < 5.8.5
(semver)
Unaffected: 5.8.5 (semver) |
|
| Red Hat | Red Hat Enterprise Linux AI (RHEL AI) 3 |
cpe:/a:redhat:enterprise_linux_ai:3 |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
|
| Red Hat | Red Hat OpenShift Dev Spaces |
cpe:/a:redhat:openshift_devspaces:3 |
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CVE-2026-3635 (GCVE-0-2026-3635)
Vulnerability from nvd – Published: 2026-03-23 13:53 – Updated: 2026-03-23 15:30
VLAI
EPSS
VEX
Title
Fastify request.protocol and request.host spoofable via X-Forwarded-Proto/Host from untrusted connections when trustProxy uses restrictive trust function
Summary
Summary
When trustProxy is configured with a restrictive trust function (e.g., a specific IP like trustProxy: '10.0.0.1', a subnet, a hop count, or a custom function), the request.protocol and request.host getters read X-Forwarded-Proto and X-Forwarded-Host headers from any connection — including connections from untrusted IPs. This allows an attacker connecting directly to Fastify (bypassing the proxy) to spoof both the protocol and host seen by the application.
Affected Versions
fastify <= 5.8.2
Impact
Applications using request.protocol or request.host for security decisions (HTTPS enforcement, secure cookie flags, CSRF origin checks, URL construction, host-based routing) are affected when trustProxy is configured with a restrictive trust function.
When trustProxy: true (trust everything), both host and protocol trust all forwarded headers — this is expected behavior. The vulnerability only manifests with restrictive trust configurations.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-348 - Use of less trusted source
Assigner
References
Impacted products
Credits
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CVE-2026-3419 (GCVE-0-2026-3419)
Vulnerability from nvd – Published: 2026-03-06 17:50 – Updated: 2026-03-09 14:55
VLAI
EPSS
VEX
Title
Fastify's Missing End Anchor in "subtypeNameReg" Allows Malformed Content-Types to Pass Validation
Summary
Fastify incorrectly accepts malformed `Content-Type` headers containing trailing characters after the subtype token, in violation of RFC 9110 §8.3.1(https://httpwg.org/specs/rfc9110.html#field.content-type). For example, a request sent with Content-Type: application/json garbage passes validation and is processed normally, rather than being rejected with 415 Unsupported Media Type.
When regex-based content-type parsers are in use (a documented Fastify feature), the malformed value is matched against registered parsers using the full string including the trailing garbage. This means a request with an invalid content-type may be routed to and processed by a parser it should never have reached.
Impact:
An attacker can send requests with RFC-invalid Content-Type headers that bypass validity checks, reach content-type parser matching, and be processed by the server. Requests that should be rejected at the validation stage are instead handled as if the content-type were valid.
Workarounds:
Deploy a WAF rule to protect against this
Fix:
The fix is available starting with v5.8.1.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-185 - Incorrect Regular Expression
Assigner
References
6 references
Impacted products
Credits
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CVE-2026-2880 (GCVE-0-2026-2880)
Vulnerability from nvd – Published: 2026-02-27 18:25 – Updated: 2026-02-27 18:56
VLAI
EPSS
VEX
Title
@fastify/middie has an improper path normalization vulnerability
Summary
A vulnerability in @fastify/middie versions < 9.2.0 can result in authentication/authorization bypass when using path-scoped middleware (for example, app.use('/secret', auth)).
When Fastify router normalization options are enabled (such as ignoreDuplicateSlashes, useSemicolonDelimiter, and related trailing-slash behavior), crafted request paths may bypass middleware checks while still being routed to protected handlers.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/middie | @fastify/middie |
Affected:
0.0.0 , < 9.2.0
(semver)
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CVE-2026-14181 (GCVE-0-2026-14181)
Vulnerability from cvelistv5 – Published: 2026-07-01 11:42 – Updated: 2026-07-01 12:05
VLAI
EPSS
VEX
Title
@fastify/middie standalone engine vulnerable to Denial of Service via malformed percent-encoded paths
Summary
@fastify/middie versions 9.1.0 through 9.3.2 fail to guard the URL normalization step used by the standalone engine when incoming request paths contain malformed percent-encoded sequences. Inputs such as an incomplete percent escape or a truncated multibyte sequence cause the underlying decoder to throw synchronously, and the exception escapes the middie normalize step and terminates the Node.js process. The bypass affects applications that call middie.run directly on the standalone engine API, causing an immediate denial of service for all connected clients until restart. Applications using the Fastify plugin path are not affected because Fastifys error handler catches the exception. Patches: upgrade to @fastify/middie 9.3.3. Workarounds: migrate from the standalone engine API to the Fastify plugin path, where the framework error handler catches the exception.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-248 - Uncaught Exception
Assigner
References
Impacted products
1 product
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| @fastify/middie | @fastify/middie |
Affected:
9.1.0 , < 9.3.3
(semver)
Unaffected: 9.3.3 (semver) |
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CVE-2026-14198 (GCVE-0-2026-14198)
Vulnerability from cvelistv5 – Published: 2026-07-01 11:29 – Updated: 2026-07-01 12:10
VLAI
EPSS
VEX
Title
@fastify/middie vulnerable to authorization bypass via encoded slash in path parameter values
Summary
@fastify/middie versions 9.1.0 through 9.3.2 decode the encoded slash %2F inside path parameter values before matching middleware paths, while Fastify's underlying router preserves the encoding during route lookup. The two layers disagree on the canonical request path, so the middleware fails to match a URL that the route handler does match. When middleware is used for authentication, authorization, rate limiting, or auditing on parameterized paths, an attacker can reach the protected handler by sending a single crafted URL with an encoded slash in the parameter position. The bypass is HTTP method agnostic and requires no authentication or special preconditions. Patches: upgrade to @fastify/middie 9.3.3. Workarounds: avoid parameterized middleware paths for security decisions, or enforce authentication at the route handler or via a Fastify hook that runs after the router has resolved the request.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
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| @fastify/middie | @fastify/middie |
Affected:
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Unaffected: 9.3.3 (semver) |
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CVE-2026-6556 (GCVE-0-2026-6556)
Vulnerability from cvelistv5 – Published: 2026-06-30 12:48 – Updated: 2026-06-30 13:30
VLAI
EPSS
VEX
Title
@fastify/express vulnerable to middleware bypass via non-string mount paths in prefixed plugins
Summary
@fastify/express versions 4.0.6 and earlier only rewrite the plugin prefix for middleware mount paths when the path argument is a string. Non-string mount paths (arrays of paths and regular expressions) are left unprefixed inside prefixed plugin scopes, so middleware registered with those forms does not match the actual prefixed request path. Applications that use path-scoped middleware for authentication, authorization, rate limiting, or auditing on routes inside a prefixed scope can be bypassed by sending a request to the prefixed route, because Fastify still matches the route but the middleware is skipped. Patches: upgrade to @fastify/express 4.0.7. Workarounds: use string mount paths instead of arrays or regular expressions in prefixed plugins, or register one use call per path.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-285 - Improper Authorization
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/express | @fastify/express |
Affected:
0 , < 4.0.7
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Unaffected: 4.0.7 (semver) |
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CVE-2026-7768 (GCVE-0-2026-7768)
Vulnerability from cvelistv5 – Published: 2026-05-04 19:14 – Updated: 2026-05-04 19:50
VLAI
EPSS
VEX
Title
@fastify/accepts-serializer vulnerable to Denial of Service via Unbounded Accept Header Cache Growth
Summary
@fastify/accepts-serializer cached serializer-selection results keyed by the request Accept header without a size limit or eviction policy. A remote unauthenticated client could send many distinct but matching Accept header variants to make the cache grow unbounded, eventually exhausting the Node.js heap and crashing the process. Versions <= 6.0.3 are affected. Update to 6.0.4 or later, which bounds the cache via an LRU with a default size of 100 entries, configurable through the new cacheSize plugin option.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/accepts-serializer | @fastify/accepts-serializer |
Affected:
0 , < 6.0.4
(semver)
Unaffected: 6.0.4 (semver) |
Credits
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CVE-2026-33804 (GCVE-0-2026-33804)
Vulnerability from cvelistv5 – Published: 2026-04-16 13:56 – Updated: 2026-04-16 14:41
VLAI
EPSS
VEX
Title
@fastify/middie vulnerable to middleware bypass via deprecated ignoreDuplicateSlashes option
Summary
@fastify/middie versions 9.3.1 and earlier are vulnerable to middleware bypass when the deprecated Fastify ignoreDuplicateSlashes option is enabled. The middleware path matching logic does not account for duplicate slash normalization performed by Fastify's router, allowing requests with duplicate slashes to bypass middleware authentication and authorization checks. This only affects applications using the deprecated ignoreDuplicateSlashes option. Upgrade to @fastify/middie 9.3.2 to fix this issue. There are no workarounds other than disabling the ignoreDuplicateSlashes option.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/middie | @fastify/middie |
Affected:
0 , < 9.3.2
(semver)
Unaffected: 9.3.2 (semver) |
Credits
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CVE-2026-6270 (GCVE-0-2026-6270)
Vulnerability from cvelistv5 – Published: 2026-04-16 13:44 – Updated: 2026-04-16 14:24
VLAI
EPSS
VEX
Title
@fastify/middie vulnerable to middleware authentication bypass in child plugin scopes
Summary
@fastify/middie versions 9.3.1 and earlier do not register inherited middleware directly on child plugin engine instances. When a Fastify application registers authentication middleware in a parent scope and then registers child plugins with @fastify/middie, the child scope does not inherit the parent middleware. This allows unauthenticated requests to reach routes defined in child plugin scopes, bypassing authentication and authorization checks. Upgrade to @fastify/middie 9.3.2 to fix this issue. There are no workarounds.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/middie | @fastify/middie |
Affected:
0 , < 9.3.2
(semver)
Unaffected: 9.3.2 (semver) |
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CVE-2026-6410 (GCVE-0-2026-6410)
Vulnerability from cvelistv5 – Published: 2026-04-16 13:29 – Updated: 2026-04-16 14:19
VLAI
EPSS
VEX
Title
@fastify/static vulnerable to path traversal in directory listing
Summary
@fastify/static versions 8.0.0 through 9.1.0 allow path traversal when directory listing is enabled via the list option. The dirList.path() function resolves directories outside the configured static root using path.join() without a containment check. A remote unauthenticated attacker can obtain directory listings for arbitrary directories accessible to the Node.js process, disclosing directory and file names. File contents are not disclosed. Upgrade to @fastify/static 9.1.1 to fix this issue. As a workaround, disable directory listing by removing the list option from the plugin configuration.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/static | @fastify/static |
Affected:
8.0.0 , < 9.1.1
(semver)
Unaffected: 9.1.1 (semver) |
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CVE-2026-6414 (GCVE-0-2026-6414)
Vulnerability from cvelistv5 – Published: 2026-04-16 13:09 – Updated: 2026-04-16 13:48
VLAI
EPSS
VEX
Title
@fastify/static vulnerable to route guard bypass via encoded path separators
Summary
@fastify/static versions 8.0.0 through 9.1.0 decode percent-encoded path separators (%2F) before filesystem resolution, while Fastify's router treats them as literal characters. This mismatch allows attackers to bypass route-based middleware or guards that protect files served by @fastify/static. For example, a route guard on a protected path can be circumvented by encoding the path separator in the URL. Upgrade to @fastify/static 9.1.1 to fix this issue. There are no workarounds.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-177 - Improper Handling of URL Encoding (Hex Encoding)
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/static | @fastify/static |
Affected:
8.0.0 , < 9.1.1
(semver)
Unaffected: 9.1.1 (semver) |
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CVE-2026-33805 (GCVE-0-2026-33805)
Vulnerability from cvelistv5 – Published: 2026-04-15 10:13 – Updated: 2026-06-30 12:07
VLAI
EPSS
VEX
Title
@fastify/reply-from vulnerable to connection header abuse enabling stripping of proxy-added headers
Summary
@fastify/reply-from v12.6.1 and earlier and @fastify/http-proxy v11.4.3 and earlier process the client's Connection header after the proxy has added its own headers via rewriteRequestHeaders. This allows attackers to retroactively strip proxy-added headers from upstream requests by listing them in the Connection header value. Any header added by the proxy for routing, access control, or security purposes can be selectively removed by a client. @fastify/http-proxy is also affected as it delegates to @fastify/reply-from.
Upgrade to @fastify/reply-from v12.6.2 or @fastify/http-proxy v11.4.4 or later.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/fastify/fastify-reply-from/sec… | |
| https://cna.openjsf.org/security-advisories.html | |
| https://access.redhat.com/security/cve/CVE-2026-33805 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2458651 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:10175 | vendor-advisoryx_refsource_REDHAT |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/reply-from | @fastify/reply-from |
Affected:
0 , < 12.6.2
(semver)
Unaffected: 12.6.2 (semver) |
|
| @fastify/reply-from | @fastify/http-proxy |
Affected:
0 , < 11.4.4
(semver)
Unaffected: 11.4.4 (semver) |
|
| Red Hat | Red Hat OpenShift Dev Spaces 3.27 |
cpe:/a:redhat:openshift_devspaces:3.27::el9 |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
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CVE-2026-33807 (GCVE-0-2026-33807)
Vulnerability from cvelistv5 – Published: 2026-04-15 09:52 – Updated: 2026-04-15 13:09
VLAI
EPSS
VEX
Title
@fastify/express vulnerable to middleware path doubling causing authentication bypass in child plugin scopes
Summary
@fastify/express v4.0.4 and earlier contains a path handling bug in the onRegister function that causes middleware paths to be doubled when inherited by child plugins. When a child plugin is registered with a prefix that matches a middleware path, the middleware path is prefixed a second time, causing it to never match incoming requests. This results in complete bypass of Express middleware security controls, including authentication, authorization, and rate limiting, for all routes defined within affected child plugin scopes. No special configuration or request crafting is required.
Upgrade to @fastify/express v4.0.5 or later.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| fastify | @fastify/express |
Affected:
0 , < 4.0.5
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Unaffected: 4.0.5 (semver) |
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CVE-2026-33808 (GCVE-0-2026-33808)
Vulnerability from cvelistv5 – Published: 2026-04-15 09:29 – Updated: 2026-04-15 13:10
VLAI
EPSS
VEX
Title
@fastify/express vulnerable to middleware authentication bypass via URL normalization gaps (duplicate slashes and semicolons)
Summary
Impact@fastify/express v4.0.4 and earlier fails to normalize URLs before passing them to Express middleware when Fastify router normalization options are enabled. This allows complete bypass of path-scoped authentication middleware via duplicate slashes when ignoreDuplicateSlashes is enabled, or via semicolon delimiters when useSemicolonDelimiter is enabled. In both cases, Fastify router normalizes the URL and matches the route, but @fastify/express passes the original un-normalized URL to Express middleware, which fails to match and is skipped. An unauthenticated attacker can access protected routes by manipulating the URL path.
PatchesUpgrade to @fastify/express v4.0.5 or later.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
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Affected:
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CVE-2026-33806 (GCVE-0-2026-33806)
Vulnerability from cvelistv5 – Published: 2026-04-15 00:14 – Updated: 2026-06-30 12:07
VLAI
EPSS
VEX
Title
fastify vulnerable to Body Schema Validation Bypass via Leading Space in Content-Type Header
Summary
Impact:
Fastify applications using schema.body.content for per-content-type body validation can have validation bypassed entirely by prepending a space to the Content-Type header. The body is still parsed correctly but schema validation is skipped.
This is a regression introduced in fastify >= 5.3.2 by the fix for CVE-2025-32442
Patches:
Upgrade to fastify v5.8.5 or later.
Workarounds:
None. Upgrade to the patched version.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/fastify/fastify/security/advis… | |
| https://cna.openjsf.org/security-advisories.html | |
| https://access.redhat.com/security/cve/CVE-2026-33806 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2458596 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| fastify | fastify |
Affected:
5.3.2 , < 5.8.5
(semver)
Unaffected: 5.8.5 (semver) |
|
| Red Hat | Red Hat Enterprise Linux AI (RHEL AI) 3 |
cpe:/a:redhat:enterprise_linux_ai:3 |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
|
| Red Hat | Red Hat OpenShift Dev Spaces |
cpe:/a:redhat:openshift_devspaces:3 |
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CVE-2026-3635 (GCVE-0-2026-3635)
Vulnerability from cvelistv5 – Published: 2026-03-23 13:53 – Updated: 2026-03-23 15:30
VLAI
EPSS
VEX
Title
Fastify request.protocol and request.host spoofable via X-Forwarded-Proto/Host from untrusted connections when trustProxy uses restrictive trust function
Summary
Summary
When trustProxy is configured with a restrictive trust function (e.g., a specific IP like trustProxy: '10.0.0.1', a subnet, a hop count, or a custom function), the request.protocol and request.host getters read X-Forwarded-Proto and X-Forwarded-Host headers from any connection — including connections from untrusted IPs. This allows an attacker connecting directly to Fastify (bypassing the proxy) to spoof both the protocol and host seen by the application.
Affected Versions
fastify <= 5.8.2
Impact
Applications using request.protocol or request.host for security decisions (HTTPS enforcement, secure cookie flags, CSRF origin checks, URL construction, host-based routing) are affected when trustProxy is configured with a restrictive trust function.
When trustProxy: true (trust everything), both host and protocol trust all forwarded headers — this is expected behavior. The vulnerability only manifests with restrictive trust configurations.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-348 - Use of less trusted source
Assigner
References
Impacted products
Credits
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CVE-2026-3419 (GCVE-0-2026-3419)
Vulnerability from cvelistv5 – Published: 2026-03-06 17:50 – Updated: 2026-03-09 14:55
VLAI
EPSS
VEX
Title
Fastify's Missing End Anchor in "subtypeNameReg" Allows Malformed Content-Types to Pass Validation
Summary
Fastify incorrectly accepts malformed `Content-Type` headers containing trailing characters after the subtype token, in violation of RFC 9110 §8.3.1(https://httpwg.org/specs/rfc9110.html#field.content-type). For example, a request sent with Content-Type: application/json garbage passes validation and is processed normally, rather than being rejected with 415 Unsupported Media Type.
When regex-based content-type parsers are in use (a documented Fastify feature), the malformed value is matched against registered parsers using the full string including the trailing garbage. This means a request with an invalid content-type may be routed to and processed by a parser it should never have reached.
Impact:
An attacker can send requests with RFC-invalid Content-Type headers that bypass validity checks, reach content-type parser matching, and be processed by the server. Requests that should be rejected at the validation stage are instead handled as if the content-type were valid.
Workarounds:
Deploy a WAF rule to protect against this
Fix:
The fix is available starting with v5.8.1.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-185 - Incorrect Regular Expression
Assigner
References
6 references
Impacted products
Credits
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CVE-2026-2880 (GCVE-0-2026-2880)
Vulnerability from cvelistv5 – Published: 2026-02-27 18:25 – Updated: 2026-02-27 18:56
VLAI
EPSS
VEX
Title
@fastify/middie has an improper path normalization vulnerability
Summary
A vulnerability in @fastify/middie versions < 9.2.0 can result in authentication/authorization bypass when using path-scoped middleware (for example, app.use('/secret', auth)).
When Fastify router normalization options are enabled (such as ignoreDuplicateSlashes, useSemicolonDelimiter, and related trailing-slash behavior), crafted request paths may bypass middleware checks while still being routed to protected handlers.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/middie | @fastify/middie |
Affected:
0.0.0 , < 9.2.0
(semver)
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