Bug 2541615 (CVE-2026-93682)

Summary: CVE-2026-93682 php: php: Out-of-bounds read via empty HTTP redirect Location header
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: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in PHP. When the HTTP stream wrapper processes a redirect response containing an empty Location header, an out-of-bounds read occurs by accessing memory beyond the allocated buffer. A malicious server can exploit this flaw to influence the client's redirect target path, potentially routing subsequent requests to unintended locations based on adjacent heap memory.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-25 20:11:13 UTC 
When the HTTP stream wrapper follows a redirect and the response carries a Location header with an empty value, the redirect code reads one byte past the end of the heap buffer holding the location. The value of that out-of-bounds byte decides which redirect target is built, so a malicious server controls whether the client is sent to the host root or to the current directory.