Bug 2531290 - CVE-2026-79516 stb: nothings stb: Local Denial of Service via out-of-bounds read [epel-all]
Summary: CVE-2026-79516 stb: nothings stb: Local Denial of Service via out-of-bounds r...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora EPEL
Classification: Fedora
Component: stb
Version: epel10
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Ben Beasley
QA Contact:
URL:
Whiteboard: {"flaws": ["bd4e8155-1cee-4df5-8805-8...
Depends On:
Blocks: CVE-2026-79516
TreeView+ depends on / blocked
 
Reported: 2026-09-10 06:27 UTC by Vladimir Vasilev
Modified: 2026-09-10 09:25 UTC (History)
2 users (show)

Fixed In Version: stb-0^20260802.2c980bb-2.fc46
Clone Of:
Environment:
Last Closed: 2026-09-10 09:25:36 UTC
Type: ---
Embargoed:

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System ID Private Priority Status Summary Last Updated
Github nothings stb issues 1963 0 None open [SECURITY] stbsp_snprintf with count=0 writes null terminator before buffer 2026-09-10 09:02:49 UTC

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.
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