RHSA-2026:13938

Vulnerability from csaf_redhat - Published: 2026-05-06 08:55 - Updated: 2026-05-08 09:04
Summary
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: httpd: * httpd-2.4.67-0.1.hum1 (aarch64, x86_64) * httpd-core-2.4.67-0.1.hum1 (aarch64, x86_64) * httpd-devel-2.4.67-0.1.hum1 (aarch64, x86_64) * httpd-filesystem-2.4.67-0.1.hum1 (noarch) * httpd-manual-2.4.67-0.1.hum1 (noarch) * httpd-tools-2.4.67-0.1.hum1 (aarch64, x86_64) * mod_ldap-2.4.67-0.1.hum1 (aarch64, x86_64) * mod_lua-2.4.67-0.1.hum1 (aarch64, x86_64) * mod_proxy_html-2.4.67-0.1.hum1 (aarch64, x86_64) * mod_session-2.4.67-0.1.hum1 (aarch64, x86_64) * mod_ssl-2.4.67-0.1.hum1 (aarch64, x86_64) * httpd-2.4.67-0.1.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.
CVE-2026-23918

A flaw was found in Apache HTTP Server. This vulnerability, related to a double free error within the HTTP/2 protocol implementation, could potentially allow a remote attacker to execute arbitrary code. Successful exploitation could lead to a complete compromise of the affected system.

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-1341 - Multiple Releases of Same Resource or Handle
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:13938
Workaround To mitigate this issue, disable the `mod_http2` module in your Apache HTTP Server configuration. This can be achieved by commenting out or removing the `LoadModule http2_module modules/mod_http2.so` line in the Apache configuration file (e.g., `/etc/httpd/conf.modules.d/00-base.conf` or a similar configuration file). After modifying the configuration, restart the httpd service for the changes to take effect. This action will impact services relying on HTTP/2 functionality.
References
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          "text": "A flaw was found in Apache HTTP Server. This vulnerability, related to a double free error within the HTTP/2 protocol implementation, could potentially allow a remote attacker to execute arbitrary code. Successful exploitation could lead to a complete compromise of the affected system.",
          "title": "Vulnerability description"
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          "text": "Apache HTTP Server: Apache HTTP Server: Remote Code Execution via Double Free in HTTP/2 Protocol",
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          "text": "This issue marked as Important rather than Moderate because it involves a memory safety violation (double free) in the HTTP/2 request handling path, which is directly exposed to untrusted network input. A double free condition can corrupt the heap allocator\u2019s internal metadata, enabling attackers to manipulate memory layout and potentially achieve arbitrary code execution (RCE) under favorable conditions. In this case, the flaw is triggered during an early stream reset in HTTP/2, meaning it can be exercised pre-authentication by a remote client without requiring complex application-level interaction. Given that Apache HTTP Server is widely deployed in internet-facing environments, even a low-probability RCE path significantly elevates risk.\n\n\n\nAdditionally, the vulnerability exists in a core protocol module rather than an optional edge feature, increasing the likelihood of exposure. It is also important to note that this vulnerability specifically affects Apache HTTP Server version 2.4.66 only, and our mod_http2 packages are not affected as they are built against non-vulnerable httpd versions.",
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            "Red Hat Hardened Images:httpd-main@noarch",
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        {
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          "product_ids": [
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            "Red Hat Hardened Images:httpd-main@src",
            "Red Hat Hardened Images:httpd-main@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:httpd-main@aarch64",
            "Red Hat Hardened Images:httpd-main@noarch",
            "Red Hat Hardened Images:httpd-main@src",
            "Red Hat Hardened Images:httpd-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "Apache HTTP Server: Apache HTTP Server: Remote Code Execution via Double Free in HTTP/2 Protocol"
    }
  ]
}


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  • 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.
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