Bug 2531290

Summary: CVE-2026-79516 stb: nothings stb: Local Denial of Service via out-of-bounds read [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Vladimir Vasilev <vvasilev>
Component: stbAssignee: Ben Beasley <code>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: epel10CC: code, mhroncok
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["bd4e8155-1cee-4df5-8805-807466c9078d"]}
Fixed In Version: stb-0^20260802.2c980bb-2.fc46 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-09-10 09:25:36 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: 2531160    

Description Vladimir Vasilev 2026-09-10 06:27:19 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.

An out-of-bounds read in the stbsp_vsnprintf function (stb_sprintf.h) of nothings stb commit 31c1ad3 allows attackers to cause a Denial of Service (DoS) via sending a crafted input.

Comment 1 Ben Beasley 2026-09-10 09:02:49 UTC
There’s a suggested patch for this in https://github.com/nothings/stb/pull/1995, but it was rejected without comment, presumably because it was drafted with AI/LLM assistance. The patch is straightforward enough and appears sensible enough to consider applying it downstream. Nothing in EPEL currently depends on the stb_sprintf library subpackage.

Comment 2 Fedora Update System 2026-09-10 09:21:01 UTC
FEDORA-2026-ee846faf9d (stb-0^20260802.2c980bb-2.fc46) has been submitted as an update to Fedora 46.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-ee846faf9d

Comment 3 Fedora Update System 2026-09-10 09:25:36 UTC
FEDORA-2026-ee846faf9d (stb-0^20260802.2c980bb-2.fc46) has been pushed to the Fedora 46 stable repository.
If problem still persists, please make note of it in this bug report.