RHSA-2026:27197
Vulnerability from csaf_redhat - Published: 2026-06-19 09:14 - Updated: 2026-06-30 04:25Summary
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-1.30.3-2.hum1 (aarch64, x86_64)
* nginx-all-modules-1.30.3-2.hum1 (noarch)
* nginx-core-1.30.3-2.hum1 (aarch64, x86_64)
* nginx-filesystem-1.30.3-2.hum1 (noarch)
* nginx-mod-devel-1.30.3-2.hum1 (aarch64, x86_64)
* nginx-mod-http-geoip-1.30.3-2.hum1 (aarch64, x86_64)
* nginx-mod-http-image-filter-1.30.3-2.hum1 (aarch64, x86_64)
* nginx-mod-http-perl-1.30.3-2.hum1 (aarch64, x86_64)
* nginx-mod-http-xslt-filter-1.30.3-2.hum1 (aarch64, x86_64)
* nginx-mod-mail-1.30.3-2.hum1 (aarch64, x86_64)
* nginx-mod-stream-1.30.3-2.hum1 (aarch64, x86_64)
* nginx-mod-stream-geoip-1.30.3-2.hum1 (aarch64, x86_64)
* nginx-1.30.3-2.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 NGINX. When NGINX is configured to proxy HTTP/2 traffic using the ngx_http_proxy_v2_module or ngx_http_grpc_module with specific settings, a remote, unauthenticated attacker can send specially crafted large headers. This can trigger a heap-based buffer overflow, leading to a restart of the NGINX worker process and a Denial of Service (DoS). Under certain conditions, such as when Address Space Layout Randomization (ASLR) is disabled or bypassed, this vulnerability could also allow for arbitrary code execution.
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. Remote, unauthenticated attackers can exploit a vulnerability in the `ngx_http_charset_module` when specific charset configurations are present. This can lead to a heap buffer over-read, potentially causing limited disclosure of memory or a denial of service by restarting the NGINX worker process.
4.8 (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
16 references
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"text": "A flaw was found in NGINX. When NGINX is configured to proxy HTTP/2 traffic using the ngx_http_proxy_v2_module or ngx_http_grpc_module with specific settings, a remote, unauthenticated attacker can send specially crafted large headers. This can trigger a heap-based buffer overflow, leading to a restart of the NGINX worker process and a Denial of Service (DoS). Under certain conditions, such as when Address Space Layout Randomization (ASLR) is disabled or bypassed, this vulnerability could also allow for arbitrary code execution.",
"title": "Vulnerability description"
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"text": "nginx: NGINX: Arbitrary code execution or Denial of Service via heap-based buffer overflow with crafted HTTP/2 headers",
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"text": "This issue is classified as Important severity primarily because:\nConditions for Exploitation: A remote, unauthenticated attacker can only exploit this if NGINX is explicitly configured to proxy HTTP/2 traffic using the ngx_http_proxy_v2_module or ngx_http_grpc_module.\n\nImpact Limitations: While the flaw reliably causes a Denial of Service (worker restart), achieving arbitrary code execution is highly complex in modern environments as it requires the attacker to bypass or disable Address Space Layout Randomization (ASLR)",
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"details": "To mitigate this vulnerability, ensure that the `ignore_invalid_headers` directive is set to `on` in your NGINX configuration, or reduce the size specified by the `large_client_header_buffers` directive to 2 megabytes or less. These changes require an NGINX service reload or restart to take effect. Reloading the NGINX service is generally safe, but a restart will briefly interrupt service.",
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]
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{
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"details": "Important"
}
],
"title": "nginx: NGINX: Arbitrary code execution or Denial of Service via heap-based buffer overflow with crafted HTTP/2 headers"
},
{
"cve": "CVE-2026-48142",
"cwe": {
"id": "CWE-125",
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"ids": [
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"notes": [
{
"category": "description",
"text": "A flaw was found in NGINX. Remote, unauthenticated attackers can exploit a vulnerability in the `ngx_http_charset_module` when specific charset configurations are present. This can lead to a heap buffer over-read, potentially causing limited disclosure of memory or a denial of service by restarting the NGINX worker process.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "nginx: NGINX: Memory disclosure or denial of service via ngx_http_charset_module heap buffer over-read",
"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"
}
],
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"Red Hat Hardened Images:nginx-main@noarch",
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"category": "none"
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{
"category": "workaround",
"details": "To mitigate this issue, avoid configuring NGINX with both `source_charset utf-8;` and an additional `charset` directive within the same location block in the `ngx_http_charset_module`. If these directives are not essential for your NGINX deployment, removing one or both will prevent the vulnerability from being exploited. After modifying the NGINX configuration, reload the NGINX service using `systemctl reload nginx`. This action may temporarily interrupt active connections.",
"product_ids": [
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"Red Hat Hardened Images:nginx-main@noarch",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 4.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/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: Memory disclosure or denial of service via ngx_http_charset_module heap buffer over-read"
}
]
}
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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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