Bug 2544571

Summary: CVE-2026-93748 sgx-pccs: http-cache-semantics: Information Disclosure via max-stale directive [fedora-all]
Product: [Fedora] Fedora Reporter: Ganesh <gnaik>
Component: sgx-pccsAssignee: Daniel Berrangé <berrange>
Status: CLOSED NOTABUG QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: berrange, mrezanin
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["68d0c258-16d4-49ba-ab81-01eda2ea28dc"]}
Fixed In Version: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-11-09 16:10:38 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2538111    

Description Ganesh 2026-10-01 11:06:19 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

http-cache-semantics through 4.2.0 fails to properly validate security-zeroed cache entries when processing client max-stale directives, allowing unauthenticated attackers to retrieve cached responses belonging to other users. Attackers can request the same URL with a large max-stale value to obtain another user's Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.
Comment 1 Daniel Berrangé 2026-11-09 16:10:38 UTC 
Upstream claims this security report is invalid

https://github.com/kornelski/http-cache-semantics/issues/56#issuecomment-5975759591

and the security advisory has been withdrawn:

https://github.com/advisories/GHSA-ch52-4w7c-c8xp