Bug 2544864 (CVE-2026-57941)

Summary: CVE-2026-57941 httpd: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: csutherl, jclere, pjindal, plodge, rhel-process-autobot, szappis, vchlup, watson-tool-maintainers, yozone
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the mod_http2 module of Apache HTTP Server. A remote, unauthenticated attacker could exploit a use-after-free condition—where memory is accessed after being released—through re-entrant processing of shared session buffers. This flaw can allow an attacker to potentially execute arbitrary code or crash the server, resulting in a Denial of Service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2548402, 2548403    
Bug Blocks:    

Description OSIDB Bzimport 2026-10-01 23:11:00 UTC
Use After Free vulnerability in Apache HTTP Server's mod_http2 via shared session->bbtmp re-entrancy



This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.