RHSA-2026:20351
Vulnerability from csaf_redhat - Published: 2026-05-23 05:23 - Updated: 2026-05-28 21:00Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
nginx:
* nginx-1.30.2-1.hum1 (aarch64, x86_64)
* nginx-all-modules-1.30.2-1.hum1 (noarch)
* nginx-core-1.30.2-1.hum1 (aarch64, x86_64)
* nginx-filesystem-1.30.2-1.hum1 (noarch)
* nginx-mod-devel-1.30.2-1.hum1 (aarch64, x86_64)
* nginx-mod-http-geoip-1.30.2-1.hum1 (aarch64, x86_64)
* nginx-mod-http-image-filter-1.30.2-1.hum1 (aarch64, x86_64)
* nginx-mod-http-perl-1.30.2-1.hum1 (aarch64, x86_64)
* nginx-mod-http-xslt-filter-1.30.2-1.hum1 (aarch64, x86_64)
* nginx-mod-mail-1.30.2-1.hum1 (aarch64, x86_64)
* nginx-mod-stream-1.30.2-1.hum1 (aarch64, x86_64)
* nginx-mod-stream-geoip-1.30.2-1.hum1 (aarch64, x86_64)
* nginx-1.30.2-1.hum1.src (src)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in the ngx_http_rewrite_module module of NGINX. When a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures and a replacement string that references multiple such captures in a redirect or arguments context, an unauthenticated attacker can send crafted HTTP requests and cause a heap-based buffer overflow in the worker process, potentially allowing code execution or a denial of service by forcing the process to restart.
8.1 (High)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:nginx-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:nginx-main@noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:nginx-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:nginx-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
A flaw was found in NGINX Plus and NGINX Open Source when configured to use the HTTP/3 QUIC module. A remote attacker could exploit this by spoofing their source IP address. This vulnerability allows for the bypass of authorization controls or rate limiting mechanisms, potentially leading to unauthorized access or resource abuse.
6.5 (Medium)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:nginx-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:nginx-main@noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:nginx-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:nginx-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
References
17 references
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"cwe": {
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"name": "Heap-based Buffer Overflow"
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"discovery_date": "2026-05-22T15:00:55.131994+00:00",
"ids": [
{
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"text": "2480746"
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"notes": [
{
"category": "description",
"text": "A flaw was found in the ngx_http_rewrite_module module of NGINX. When a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures and a replacement string that references multiple such captures in a redirect or arguments context, an unauthenticated attacker can send crafted HTTP requests and cause a heap-based buffer overflow in the worker process, potentially allowing code execution or a denial of service by forcing the process to restart.",
"title": "Vulnerability description"
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"text": "nginx: ngx_http_rewrite_module: code execution and denial of service",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "To exploit this vulnerability, a rewrite directive must be configured with a regex pattern that uses distinct, overlapping PCRE captures and a replacement string referencing multiple such captures, limiting its exposure as this is not the default configuration. This issue allows an attacker to potentially execute arbitrary code or cause a denial of service by forcing the worker process to restart.\n\nDefault Red Hat Enterprise Linux security features, including SELinux enforcement, Address Space Layout Randomization (ASLR) and NX (No-Execute) stack protection, significantly increase the difficulty of achieving arbitrary code execution, limiting the impact of this vulnerability.\n\nDue to these reasons, this flaw has been rated with an important severity.",
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"details": "To mitigate this vulnerability, use named captures instead of unnamed captures in rewrite definitions.\n\nFor example, the following rewrite directive uses unnamed PCRE capture groups, $1 and $2:\n\n~~~\nrewrite ^/users/([0-9]+)/profile/(.*)$ /profile.php?id=$1\u0026tab=$2 last;\n~~~\n\nTo mitigate this vulnerability for this example, replace $1 and $2 with the appropriate named captures, $user_id and $section:\n\n~~~\nrewrite ^/users/(?\u003cuser_id\u003e[0-9]+)/profile/(?\u003csection\u003e.*)$ /profile.php?id=$user_id\u0026tab=$section last;\n~~~",
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"scores": [
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"products": [
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"Red Hat Hardened Images:nginx-main@noarch",
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"Red Hat Hardened Images:nginx-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "nginx: ngx_http_rewrite_module: code execution and denial of service"
},
{
"cve": "CVE-2026-40460",
"cwe": {
"id": "CWE-290",
"name": "Authentication Bypass by Spoofing"
},
"discovery_date": "2026-05-13T16:04:19.875658+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2477113"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in NGINX Plus and NGINX Open Source when configured to use the HTTP/3 QUIC module. A remote attacker could exploit this by spoofing their source IP address. This vulnerability allows for the bypass of authorization controls or rate limiting mechanisms, potentially leading to unauthorized access or resource abuse.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "nginx: NGINX: Authorization bypass via IP spoofing in HTTP/3 QUIC module",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"Red Hat Hardened Images:nginx-main@aarch64",
"Red Hat Hardened Images:nginx-main@noarch",
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2477113"
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"release_date": "2026-05-13T14:12:45.291000+00:00",
"remediations": [
{
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"date": "2026-05-23T05:23:30+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:nginx-main@aarch64",
"Red Hat Hardened Images:nginx-main@noarch",
"Red Hat Hardened Images:nginx-main@src",
"Red Hat Hardened Images:nginx-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:20351"
},
{
"category": "workaround",
"details": "To mitigate this issue, if the HTTP/3 QUIC module is not required, disable it in your NGINX configuration. This typically involves removing or commenting out the `quic` parameter from `listen` directives in your `nginx.conf` file. After modifying the configuration, a graceful reload or restart of the NGINX service is required for the changes to take effect. For example, use `sudo systemctl reload nginx` or `sudo systemctl restart nginx`.",
"product_ids": [
"Red Hat Hardened Images:nginx-main@aarch64",
"Red Hat Hardened Images:nginx-main@noarch",
"Red Hat Hardened Images:nginx-main@src",
"Red Hat Hardened Images:nginx-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:nginx-main@aarch64",
"Red Hat Hardened Images:nginx-main@noarch",
"Red Hat Hardened Images:nginx-main@src",
"Red Hat Hardened Images:nginx-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "nginx: NGINX: Authorization bypass via IP spoofing in HTTP/3 QUIC module"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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