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No exploitation reportedFix available

CVE-2021-42716

No exploitation reported by the sources we read.

  • Published2021-10-21
  • WeaknessCWE-120

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An issue was discovered in stb stb_image.h 2.27. The PNM loader incorrectly interpreted 16-bit PGM files as 8-bit when converting to RGBA, leading to a buffer overflow when later reinterpreting the result as a 16-bit buffer. An attacker could potentially have crashed a service using stb_image, or read up to 1024 bytes of non-consecutive heap data without control over the read location.

Timeline

dates in UTC
  1. 2021-10-2119:15CVE publishedNVD

Versions per branch

NVD
Fedoraproject fedora
BranchAffectedFixed in
33.x= 33no fix published
34.x= 34no fix published
35.x= 35no fix published
Nothings stb image.h
BranchAffectedFixed in
2.27= 2.27no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • curaengineMageia:8all versions · fixed in 4.8.0-1.1.mga8
  • libstbUbuntu:26.10all versions · no fixed version listed
  • libstbUbuntu:26.04:LTSall versions · no fixed version listed
  • libstbUbuntu:25.10all versions · no fixed version listed
  • libstbUbuntu:24.04:LTSall versions · no fixed version listed
  • libstbUbuntu:22.04:LTSall versions · no fixed version listed
  • libstbUbuntu:20.04:LTSall versions · no fixed version listed
  • libstbDebian:14all versions · fixed in 0.0~git20230129.5736b15+ds-1

10 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-42716 Red Hat Product Security3 known affected

    stb: heap-based buffer overflow in stb_image PNM loader

    clutter as a component of Red Hat Enterprise Linux 6 · clutter-devel as a component of Red Hat Enterprise Linux 6 · clutter-doc as a component of Red Hat Enterprise Linux 6

Full record on NVD

Fix

  1. No fix planned, says the vendor Red Hat Product Security CVE-2021-42716 · 3 productsOut of support scope

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Published
2021-10-21
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-44mr-92xw-jfrv

Frequently asked questions

What is CVE-2021-42716?

An issue was discovered in stb stb_image.h 2.27. The PNM loader incorrectly interpreted 16-bit PGM files as 8-bit when converting to RGBA, leading to a buffer overflow when later reinterpreting the result as a 16-bit buffer. An attacker could potentially have crashed a service using stb_image, or read up to 1024 bytes of non-consecutive heap data without control over the read location.

Is CVE-2021-42716 actively exploited?

Active exploitation of CVE-2021-42716 has not been confirmed. Its EPSS score was 1.5% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-42716?

CVE-2021-42716 has a CVSS v3 base score of 7.1 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.

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