Common Weakness Enumeration
CWE-248
AllowedUncaught Exception
Abstraction: Base · Status: Draft
An exception is thrown from a function, but it is not caught.
647 vulnerabilities reference this CWE, most recent first.
CVE-2026-87018 (GCVE-0-2026-87018)
Vulnerability from cvelistv5 – Published: 2026-10-15 18:38 – Updated: 2026-10-16 20:01
VLAI
EPSS
VEX
Title
undici vulnerable to Denial of Service via TLS 1.2 certificate-changing renegotiation
Summary
undici is an HTTP client library for Node.js. In versions 4.2.1 through 6.29.0, 7.0.0 through 7.30.0, and 8.0.0 through 8.12.1, the client process crashes when a TLS 1.2 server renegotiates after the connection is established and presents a different, CA-trusted certificate whose hostname does not match the requested host. Node.js re-runs hostname verification on the renegotiated handshake and destroys the socket with a certificate-altname error, but undici's established-socket error handler asserted that this error code could never occur, so the peer-controlled error became an uncaught assertion that terminates the Node.js process, affecting both the HTTP/1.1 and HTTP/2 paths. A malicious or compromised HTTPS endpoint reached through undici or the global fetch() can crash the client with a single server-initiated renegotiation, taking down all in-flight requests and background work in the process, and exploitation needs no CA compromise because the attacker controls the endpoint and can present two ordinary valid certificates. Only TLS 1.2 is affected, since TLS 1.3 does not support renegotiation. The issue is fixed in undici 6.29.1, 7.30.1, and 8.12.2, and users should upgrade to one of those versions or later. As a workaround, restrict outbound connections to TLS 1.3 so renegotiation cannot occur, when the target endpoints support it.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 20:01 UTC
Assigner
References
Impacted products
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CVE-2026-86537 (GCVE-0-2026-86537)
Vulnerability from cvelistv5 – Published: 2026-10-02 11:40 – Updated: 2026-10-02 14:02
VLAI
EPSS
VEX
Title
Apache Thrift: A truncated HTTP request stops the D library's server, allowing an unauthenticated remote attacker to deny service
Summary
Uncaught exception, Loop with unreachable exit condition ('infinite loop'), Integer underflow (wrap or wraparound) vulnerability in Apache Thrift D language bindings.
This issue affects Apache Thrift: before 0.25.0.
Users are recommended to upgrade to version 0.25.0, which fixes the issue.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 14:01 UTC
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/33otcgbqd27wf6qq8… | vendor-advisory |
| https://lists.apache.org/thread/k14jfr1xwc0vtmm2s… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Thrift |
Affected:
0 , < 0.25.0
(semver)
|
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CVE-2026-85494 (GCVE-0-2026-85494)
Vulnerability from cvelistv5 – Published: 2026-10-02 10:42 – Updated: 2026-10-07 22:06
VLAI
EPSS
VEX
Title
Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift: Framed transport and binary protocol size read buffers from a peer-declared length without a limit (multi-language)
Summary
Improper handling of length parameter inconsistency, Uncaught exception, Inefficient Algorithmic Complexity, Memory allocation with excessive size value, Initialization of a resource with an insecure default vulnerability in Apache Thrift Python, Ruby, Erlang, Lua, Dart, JavaME, Perl, PHP and D language bindings.
This issue affects Apache Thrift: before 0.25.0.
Users are recommended to upgrade to version 0.25.0, which fixes the issue.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-07 20:56 UTC
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/33otcgbqd27wf6qq8… | vendor-advisory |
| https://lists.apache.org/thread/rm0m34gt6fh1flvt1… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Thrift |
Affected:
0 , < 0.25.0
(semver)
|
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CVE-2026-85493 (GCVE-0-2026-85493)
Vulnerability from cvelistv5 – Published: 2026-10-02 10:45 – Updated: 2026-10-02 16:13
VLAI
EPSS
VEX
Title
Apache Thrift, Apache Thrift: TProtocolUtil.skip follows peer-chosen nesting to any depth the stack allows (Dart, Java ME)
Summary
Uncontrolled Recursion vulnerability in Apache Thrift Dart and Java ME bindings.
This issue affects Apache Thrift: before 0.25.0.
Users are recommended to upgrade to version 0.25.0, which fixes the issue.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 16:13 UTC
Assigner
References
2 references
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|---|---|
| https://lists.apache.org/thread/33otcgbqd27wf6qq8… | vendor-advisory |
| https://lists.apache.org/thread/oqr0h2k1cg9hho3oh… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Thrift |
Affected:
0 , < 0.25.0
(semver)
|
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CVE-2026-85024 (GCVE-0-2026-85024)
Vulnerability from cvelistv5 – Published: 2026-09-04 16:20 – Updated: 2026-09-04 19:30
VLAI
EPSS
VEX
Title
undici vulnerable to Denial of Service via unhandled error in WebSocket permessage-deflate decompression
Summary
undici bundles a WebSocket client whose permessage-deflate size-limit cleanup removes all listeners from the internal zlib inflate stream, including its error listener, while that stream can still emit. When a remote peer sends a compressed payload that crosses the built-in 128 MiB decompressed-payload limit and then contains a malformed DEFLATE byte, the inflate stream emits a data error with no listener attached, which Node.js treats as a fatal unhandled error and terminates the entire process. Exploitation is remote and unauthenticated, requires no application mistake, and is asymmetric, since roughly 130 KB on the wire expands past the limit and crashes the process, and reconnecting can repeat the crash. This affects undici versions from 6.25.0 up to 6.28.1, from 7.28.0 up to 7.29.1, and from 8.1.0 up to 8.10.2. Users should upgrade to undici 6.28.1, 7.29.1, or 8.10.2.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 19:30 UTC
CWE
- CWE-248 - Uncaught Exception
Assigner
References
Impacted products
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CVE-2026-85014 (GCVE-0-2026-85014)
Vulnerability from cvelistv5 – Published: 2026-09-04 16:30 – Updated: 2026-09-04 19:30
VLAI
EPSS
VEX
Title
undici vulnerable to Denial of Service via WebSocketStream unclean close
Summary
undici's experimental WebSocketStream client crashes the whole Node.js process when a remote peer closes the TCP connection without a WebSocket close handshake. On an unclean close the internal socket-close handler calls abort on the writable stream unconditionally and discards the returned promise, but per the WHATWG Streams standard aborting a locked writable returns a promise that rejects with a TypeError. Because the application holds a writer on that writable, which is the only way to write, the rejection is never observed and Node's default unhandled-rejection behavior terminates the process. An untrusted server can therefore crash a client with a single abrupt disconnect, with no authentication and no application mistake. This affects undici versions from 7.0.0 up to 7.29.1 and from 8.0.0 up to 8.10.2. Users should upgrade to undici 7.29.1 or 8.10.2.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 19:30 UTC
Assigner
References
Impacted products
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CVE-2026-84994 (GCVE-0-2026-84994)
Vulnerability from cvelistv5 – Published: 2026-10-13 19:00 – Updated: 2026-10-14 16:36
VLAI
EPSS
VEX
Title
Qwik: Crashing any Qwik Server via Resource thenable
Summary
Qwik is a performance-focused JavaScript framework. Prior to @builder.io/qwik 1.20.0 and @qwik.dev/core 2.0.0-beta.37, default server-side qwik-json deserialization causes ResourceSerializer.$fill$ to pass resource._resolved to Promise.resolve without first rejecting attacker-controlled thenables. An unauthenticated request can provide a plain object whose then property is a QRL for an unregistered symbol, causing an orphaned asynchronous rejection that terminates Node.js under its default unhandled-rejection policy. A single request can crash a server, and repeated requests can keep replicas unavailable. This issue is fixed in @builder.io/qwik 1.20.0 and @qwik.dev/core 2.0.0-beta.37.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-14 16:35 UTC
CWE
- CWE-248 - Uncaught Exception
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/QwikDev/qwik/security/advisori… | x_refsource_CONFIRM |
| https://github.com/QwikDev/qwik/pull/8655 | x_refsource_MISC |
| https://github.com/QwikDev/qwik/commit/c1e7444402… | x_refsource_MISC |
| https://github.com/QwikDev/qwik/releases/tag/@bui… | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| QwikDev | qwik |
Affected:
< 2.0.0-beta37
|
|
| @builder.io | qwik |
Affected:
< 1.20.0
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CVE-2026-84947 (GCVE-0-2026-84947)
Vulnerability from cvelistv5 – Published: 2026-09-04 16:53 – Updated: 2026-09-04 18:35
VLAI
EPSS
VEX
Title
undici vulnerable to response truncation via oversized chunked responses in the dump interceptor
Summary
undici's dump interceptor reads and discards a response body up to a configurable maximum size. When a response declares a Content-Length that exceeds the maximum, the interceptor aborts cleanly, but when a response has no Content-Length and is chunked, the interceptor instead signals completion early once the accumulated size reaches the maximum, without pausing or aborting the request. Because the underlying parser keeps delivering body bytes, a second completion signal fires and trips an internal assertion, which aborts the request and tears down the connection. The application is left observing a misleading successful status with an empty or truncated body while the connection has actually been disconnected. This affects undici versions from 7.1.0 up to 7.29.1 and from 8.0.0 up to 8.10.2. Users should upgrade to undici 7.29.1 or 8.10.2.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 18:34 UTC
Assigner
References
Impacted products
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CVE-2026-84445 (GCVE-0-2026-84445)
Vulnerability from cvelistv5 – Published: 2026-09-14 16:11 – Updated: 2026-09-14 16:36
VLAI
EPSS
VEX
Title
gRPC-Go: Denial of Service (DoS) via crash due to missing `:authority` and `Host` headers in the xDS servers
Summary
gRPC-Go is the Go language implementation of gRPC. Prior to 1.82.2 and 1.83.2, servers created with xds.NewGRPCServer() allow internal/transport/http2_server.go to accept an RPC containing neither the :authority header nor the Host header, while RouteAndProcess in internal/xds/server/routing.go assumes that an authority value exists and indexes the empty slice. A remote client that can complete transport connection establishment can trigger an index-out-of-bounds panic that is not recovered by the per-RPC goroutine and terminates the entire server process. In insecure or ordinary TLS deployments the request can be unauthenticated, while strict mTLS or ALTS deployments require valid transport credentials before the malformed RPC can reach the interceptor. This issue is fixed in versions 1.82.2 and 1.83.2.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 16:36 UTC
Assigner
References
10 references
| URL | Tags |
|---|---|
| https://github.com/grpc/grpc-go/security/advisori… | x_refsource_CONFIRM |
| https://github.com/grpc/grpc-go/issues/9354 | x_refsource_MISC |
| https://github.com/grpc/grpc-go/pull/9365 | x_refsource_MISC |
| https://github.com/grpc/grpc-go/pull/9366 | x_refsource_MISC |
| https://github.com/grpc/grpc-go/pull/9367 | x_refsource_MISC |
| https://github.com/grpc/grpc-go/commit/3822494d8e… | x_refsource_MISC |
| https://github.com/grpc/grpc-go/commit/8668b69c16… | x_refsource_MISC |
| https://github.com/grpc/grpc-go/commit/93e31b4854… | x_refsource_MISC |
| https://github.com/grpc/grpc-go/releases/tag/v1.82.2 | x_refsource_MISC |
| https://github.com/grpc/grpc-go/releases/tag/v1.83.2 | x_refsource_MISC |
Impacted products
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CVE-2026-82417 (GCVE-0-2026-82417)
Vulnerability from cvelistv5 – Published: 2026-08-29 23:51 – Updated: 2026-08-31 17:08
VLAI
EPSS
VEX
Title
qs.stringify throws TypeError on objects with a non-callable constructor.isBuffer property
Summary
### Summary
`qs.stringify` throws a `TypeError` when it serializes an object whose own `constructor` property has a truthy, non-callable `isBuffer` member. `utils.isBuffer` duck-types buffers by calling `obj.constructor.isBuffer(obj)` after checking only that the property is truthy, so a value such as `{ constructor: { isBuffer: "x" } }` makes the call throw `TypeError: obj.constructor.isBuffer is not a function`.
### Details
`lib/stringify.js:127` calls `utils.isBuffer` on every non-primitive value it serializes. `utils.isBuffer` (`lib/utils.js:332`) reads `obj.constructor.isBuffer` and invokes it without verifying that it is a function. `constructor` and `isBuffer` are ordinary property names, so any object carrying them as own properties reaches the unchecked call.
Such an object can be built from untrusted input. `qs.parse("x[constructor][isBuffer]=y", { plainObjects: true })` or `{ allowPrototypes: true }` keeps the `constructor` key as an own property (the default parse options drop it), and `JSON.parse("{\"a\":{\"constructor\":{\"isBuffer\":\"x\"}}}")` produces the same shape with no qs option involved. Express 4 with its default `query parser` setting and body-parser with `extended: true` both call `qs.parse` with `allowPrototypes: true`, so on those stacks `req.query` and `req.body` can carry the shape directly.
#### PoC
```js
var qs = require("qs");
qs.stringify(qs.parse("x[constructor][isBuffer]=y", { plainObjects: true }));
qs.stringify(JSON.parse("{\"a\":{\"constructor\":{\"isBuffer\":\"x\"}}}"));
// TypeError: obj.constructor.isBuffer is not a function
// at Object.isBuffer (lib/utils.js:332:78)
// at stringify (lib/stringify.js:127:45)
```
#### Fix
`lib/utils.js`, applied in e83d321 on `main` and released as v6.16.0:
```diff
- return !!(obj.constructor && obj.constructor.isBuffer && obj.constructor.isBuffer(obj));
+ return !!(obj.constructor && typeof obj.constructor.isBuffer === "function" && obj.constructor.isBuffer(obj));
```
Real `Buffer`, `safer-buffer`, and browserify `buffer` polyfill instances serialize exactly as before; only the throw is removed.
### Affected versions
`>=2.2.5 <6.16.0`, fixed in v6.16.0.
The unguarded duck-type was introduced in 3768a75 and first shipped in v2.2.5 (September 2014). v2.2.4 and earlier used `Buffer.isBuffer` and are not affected. Every release from v2.2.5 through v6.15.3 contains the unguarded call.
### Impact
An unauthenticated request can make any code path that re-serializes attacker-influenced data with `qs.stringify` (for example, rebuilding a query string from `req.query` for a redirect or an upstream request, or serializing a parsed JSON body) throw synchronously. In a typical Node.js HTTP framework the throw is caught by the framework error boundary and the affected request returns a 500; the process survives and other requests are unaffected. Where the call runs outside an error boundary, such as an `async` Express 4 handler (where the throw becomes an unhandled promise rejection) or a background job, the process exits, so the impact in that case depends on the application error handling rather than on qs.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 17:07 UTC
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/ljharb/qs/security/advisories/… | vendor-advisory |
| https://github.com/ljharb/qs/commit/e83d321ffafb3… | patch |
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"collectionURL": "https://npmjs.com/qs",
"defaultStatus": "unaffected",
"packageName": "qs",
"product": "qs",
"repo": "https://github.com/ljharb/qs",
"vendor": "ljharb",
"versions": [
{
"lessThan": "6.16.0",
"status": "affected",
"version": "2.2.5",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "waydeshi"
},
{
"lang": "en",
"type": "remediation developer",
"value": "ljharb"
}
],
"descriptions": [
{
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"value": "\u003cp\u003e### Summary\u003c/p\u003e\u003cp\u003e`qs.stringify` throws a `TypeError` when it serializes an object whose own `constructor` property has a truthy, non-callable `isBuffer` member. `utils.isBuffer` duck-types buffers by calling `obj.constructor.isBuffer(obj)` after checking only that the property is truthy, so a value such as `{ constructor: { isBuffer: \"x\" } }` makes the call throw `TypeError: obj.constructor.isBuffer is not a function`.\u003c/p\u003e\u003cp\u003e### Details\u003c/p\u003e\u003cp\u003e`lib/stringify.js:127` calls `utils.isBuffer` on every non-primitive value it serializes. `utils.isBuffer` (`lib/utils.js:332`) reads `obj.constructor.isBuffer` and invokes it without verifying that it is a function. `constructor` and `isBuffer` are ordinary property names, so any object carrying them as own properties reaches the unchecked call.\u003c/p\u003e\u003cp\u003eSuch an object can be built from untrusted input. `qs.parse(\"x[constructor][isBuffer]=y\", { plainObjects: true })` or `{ allowPrototypes: true }` keeps the `constructor` key as an own property (the default parse options drop it), and `JSON.parse(\"{\\\"a\\\":{\\\"constructor\\\":{\\\"isBuffer\\\":\\\"x\\\"}}}\")` produces the same shape with no qs option involved. Express 4 with its default `query parser` setting and body-parser with `extended: true` both call `qs.parse` with `allowPrototypes: true`, so on those stacks `req.query` and `req.body` can carry the shape directly.\u003c/p\u003e\u003cp\u003e#### PoC\u003c/p\u003e\u003cp\u003e```js\u003c/p\u003e\u003cp\u003evar qs = require(\"qs\");\u003c/p\u003e\u003cp\u003eqs.stringify(qs.parse(\"x[constructor][isBuffer]=y\", { plainObjects: true }));\u003c/p\u003e\u003cp\u003eqs.stringify(JSON.parse(\"{\\\"a\\\":{\\\"constructor\\\":{\\\"isBuffer\\\":\\\"x\\\"}}}\"));\u003c/p\u003e\u003cp\u003e// TypeError: obj.constructor.isBuffer is not a function\u003c/p\u003e\u003cp\u003e// at Object.isBuffer (lib/utils.js:332:78)\u003c/p\u003e\u003cp\u003e// at stringify (lib/stringify.js:127:45)\u003c/p\u003e\u003cp\u003e```\u003c/p\u003e\u003cp\u003e#### Fix\u003c/p\u003e\u003cp\u003e`lib/utils.js`, applied in e83d321 on `main` and released as v6.16.0:\u003c/p\u003e\u003cp\u003e```diff\u003c/p\u003e\u003cp\u003e- return !!(obj.constructor \u0026amp;\u0026amp; obj.constructor.isBuffer \u0026amp;\u0026amp; obj.constructor.isBuffer(obj));\u003c/p\u003e\u003cp\u003e+ return !!(obj.constructor \u0026amp;\u0026amp; typeof obj.constructor.isBuffer === \"function\" \u0026amp;\u0026amp; obj.constructor.isBuffer(obj));\u003c/p\u003e\u003cp\u003e```\u003c/p\u003e\u003cp\u003eReal `Buffer`, `safer-buffer`, and browserify `buffer` polyfill instances serialize exactly as before; only the throw is removed.\u003c/p\u003e\u003cp\u003e### Affected versions\u003c/p\u003e\u003cp\u003e`\u0026gt;=2.2.5 \u0026lt;6.16.0`, fixed in v6.16.0.\u003c/p\u003e\u003cp\u003eThe unguarded duck-type was introduced in 3768a75 and first shipped in v2.2.5 (September 2014). v2.2.4 and earlier used `Buffer.isBuffer` and are not affected. Every release from v2.2.5 through v6.15.3 contains the unguarded call.\u003c/p\u003e\u003cp\u003e### Impact\u003c/p\u003e\u003cp\u003eAn unauthenticated request can make any code path that re-serializes attacker-influenced data with `qs.stringify` (for example, rebuilding a query string from `req.query` for a redirect or an upstream request, or serializing a parsed JSON body) throw synchronously. In a typical Node.js HTTP framework the throw is caught by the framework error boundary and the affected request returns a 500; the process survives and other requests are unaffected. Where the call runs outside an error boundary, such as an `async` Express 4 handler (where the throw becomes an unhandled promise rejection) or a background job, the process exits, so the impact in that case depends on the application error handling rather than on qs.\u003c/p\u003e"
}
],
"value": "### Summary\n\n\n\n`qs.stringify` throws a `TypeError` when it serializes an object whose own `constructor` property has a truthy, non-callable `isBuffer` member. `utils.isBuffer` duck-types buffers by calling `obj.constructor.isBuffer(obj)` after checking only that the property is truthy, so a value such as `{ constructor: { isBuffer: \"x\" } }` makes the call throw `TypeError: obj.constructor.isBuffer is not a function`.\n\n\n\n### Details\n\n\n\n`lib/stringify.js:127` calls `utils.isBuffer` on every non-primitive value it serializes. `utils.isBuffer` (`lib/utils.js:332`) reads `obj.constructor.isBuffer` and invokes it without verifying that it is a function. `constructor` and `isBuffer` are ordinary property names, so any object carrying them as own properties reaches the unchecked call.\n\n\n\nSuch an object can be built from untrusted input. `qs.parse(\"x[constructor][isBuffer]=y\", { plainObjects: true })` or `{ allowPrototypes: true }` keeps the `constructor` key as an own property (the default parse options drop it), and `JSON.parse(\"{\\\"a\\\":{\\\"constructor\\\":{\\\"isBuffer\\\":\\\"x\\\"}}}\")` produces the same shape with no qs option involved. Express 4 with its default `query parser` setting and body-parser with `extended: true` both call `qs.parse` with `allowPrototypes: true`, so on those stacks `req.query` and `req.body` can carry the shape directly.\n\n\n\n#### PoC\n\n\n\n```js\n\n\n\nvar qs = require(\"qs\");\n\n\n\nqs.stringify(qs.parse(\"x[constructor][isBuffer]=y\", { plainObjects: true }));\n\n\n\nqs.stringify(JSON.parse(\"{\\\"a\\\":{\\\"constructor\\\":{\\\"isBuffer\\\":\\\"x\\\"}}}\"));\n\n\n\n// TypeError: obj.constructor.isBuffer is not a function\n\n\n\n// at Object.isBuffer (lib/utils.js:332:78)\n\n\n\n// at stringify (lib/stringify.js:127:45)\n\n\n\n```\n\n\n\n#### Fix\n\n\n\n`lib/utils.js`, applied in e83d321 on `main` and released as v6.16.0:\n\n\n\n```diff\n\n\n\n- return !!(obj.constructor \u0026\u0026 obj.constructor.isBuffer \u0026\u0026 obj.constructor.isBuffer(obj));\n\n\n\n+ return !!(obj.constructor \u0026\u0026 typeof obj.constructor.isBuffer === \"function\" \u0026\u0026 obj.constructor.isBuffer(obj));\n\n\n\n```\n\n\n\nReal `Buffer`, `safer-buffer`, and browserify `buffer` polyfill instances serialize exactly as before; only the throw is removed.\n\n\n\n### Affected versions\n\n\n\n`\u003e=2.2.5 \u003c6.16.0`, fixed in v6.16.0.\n\n\n\nThe unguarded duck-type was introduced in 3768a75 and first shipped in v2.2.5 (September 2014). v2.2.4 and earlier used `Buffer.isBuffer` and are not affected. Every release from v2.2.5 through v6.15.3 contains the unguarded call.\n\n\n\n### Impact\n\n\n\nAn unauthenticated request can make any code path that re-serializes attacker-influenced data with `qs.stringify` (for example, rebuilding a query string from `req.query` for a redirect or an upstream request, or serializing a parsed JSON body) throw synchronously. In a typical Node.js HTTP framework the throw is caught by the framework error boundary and the affected request returns a 500; the process survives and other requests are unaffected. Where the call runs outside an error boundary, such as an `async` Express 4 handler (where the throw becomes an unhandled promise rejection) or a background job, the process exits, so the impact in that case depends on the application error handling rather than on qs."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
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"lang": "en",
"value": "GENERAL"
}
]
},
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "LOW",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
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"lang": "en",
"value": "GENERAL"
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]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-248",
"description": "CWE-248 Uncaught Exception",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-703",
"description": "CWE-703 Improper Check or Handling of Exceptional Conditions",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-29T23:51:27.634Z",
"orgId": "7ffcee3d-2c14-4c3e-b844-86c6a321a158",
"shortName": "harborist"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://github.com/ljharb/qs/security/advisories/GHSA-4mjr-xmp4-gh2g"
},
{
"tags": [
"patch"
],
"url": "https://github.com/ljharb/qs/commit/e83d321ffafb38cf210683ac31714fce6ce1c6c6"
}
],
"solutions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eUpgrade to qs 6.16.0 or later.\u003c/p\u003e"
}
],
"value": "Upgrade to qs 6.16.0 or later."
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "qs.stringify throws TypeError on objects with a non-callable constructor.isBuffer property",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
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"value": "\u003cp\u003ePass a `filter` function to `qs.stringify` that drops values carrying an own `constructor` property; it runs before the `isBuffer` check. Alternatively, wrap `qs.stringify` calls on externally influenced objects in try/catch, and avoid `allowPrototypes: true` / `plainObjects: true` when parsed untrusted input is fed back into `qs.stringify`.\u003c/p\u003e"
}
],
"value": "Pass a `filter` function to `qs.stringify` that drops values carrying an own `constructor` property; it runs before the `isBuffer` check. Alternatively, wrap `qs.stringify` calls on externally influenced objects in try/catch, and avoid `allowPrototypes: true` / `plainObjects: true` when parsed untrusted input is fed back into `qs.stringify`."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "7ffcee3d-2c14-4c3e-b844-86c6a321a158",
"assignerShortName": "harborist",
"cveId": "CVE-2026-82417",
"datePublished": "2026-08-29T23:51:27.634Z",
"dateReserved": "2026-08-28T23:08:00.460Z",
"dateUpdated": "2026-08-31T17:08:24.074Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.