Bug 2449468

Summary: CVE-2026-32874 python-ujson: UltraJSON: Denial of Service due to memory leak when parsing large integers [epel-8]
Product: [Fedora] Fedora EPEL Reporter: Sandipan Roy <saroy>
Component: python-ujsonAssignee: kushaldas@gmail.com <mail>
Status: CLOSED CANTFIX QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: epel8CC: code, igor.raits, mail, python-packagers-sig
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["8ccf21d3-d9f5-4c7b-ad34-eed902d44fbe"]}
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Clone Of: Environment:
Last Closed: 2026-03-20 08:38:05 UTC Type: ---
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Documentation: --- CRM:
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2449411    

Description Sandipan Roy 2026-03-20 06:43:36 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.
Comment 1 Ben Beasley 2026-03-20 08:38:05 UTC 
More details in https://www.cve.org/CVERecord?id=CVE-2026-32874 and https://github.com/ultrajson/ultrajson/security/advisories/GHSA-wgvc-ghv9-3pmm; fixed in 5.12.0 with https://github.com/ultrajson/ultrajson/commit/4baeb950df780092bd3c89fc702a868e99a3a1d2.

It’s not possible to update python-ujson in EPEL8 without an Updates Policy exception due to breaking changes, and the code has diverged so much since the packaged version that the commit that fixed this cannot be straightforwardly backported. In fact, it’s not even clear that the issue exists in such an old version.

I’m not planning to attempt any changes here. Anyone who has an argument or concrete plan otherwise may feel free to reopen this.