Bug 2563075

Summary: CVE-2026-115455 mingw-gcc: Stack overflow in std::bitset on libstdc++ [fedora-all]
Product: [Fedora] Fedora Reporter: Marco Benatto <mbenatto>
Component: mingw-gccAssignee: Kalev Lember <kalevlember>
Status: CLOSED NEXTRELEASE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: kalevlember, manisandro, marcandre.lureau, rjones
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["cae45a16-e4cd-4afa-b5dc-473cdaaf649b"]}
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Clone Of: Environment:
Last Closed: 2026-10-28 22:03:56 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2562933    

Description Marco Benatto 2026-10-28 17:52:56 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.

There's a Stack corruption in std::bitset stream extraction in libstdc++. The __builtin_alloca argument didn't account for the size or alignment of wide characters resulting in a stack buffer overflow.
Comment 1 Sandro Mani 2026-10-28 22:03:56 UTC 
I don't think a bug in a compiler qualifies for a CVE. This will be fixed with regular upstream gcc releases, as they become available.