CVE-2026-42146
CVE-2026-42146 is a medium-severity vulnerability with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-789.
Key facts
- Severity: Medium (CVSS 3.x base score 5.5)
- EPSS exploit prediction: 0% (2nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-27077
- Weakness: CWE-789
- Published:
- Last modified:
Description
CImg Library is a C++ library for image processing. Prior to commit c3aacf5, the nb_colors field read from the BMP file header is used directly to compute an allocation size without validating it against the remaining file size. A crafted BMP file with a large nb_colors value triggers an out-of-memory condition, crashing any application that uses CImg to load untrusted BMP files. This issue has been patched via commit c3aacf5.
Frequently asked questions
- What is CVE-2026-42146?
- CImg Library is a C++ library for image processing. Prior to commit c3aacf5, the nb_colors field read from the BMP file header is used directly to compute an allocation size without validating it against the remaining file size. A crafted BMP file with a large nb_colors value triggers an out-of-memory condition, crashing any application that uses CImg to load untrusted BMP files. This issue has been patched via commit c3aacf5.
- How severe is CVE-2026-42146?
- CVE-2026-42146 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2026-42146 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-42146?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-42146 have an EU (EUVD) identifier?
- Yes. CVE-2026-42146 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27077.
- When was CVE-2026-42146 published?
- CVE-2026-42146 was published on 2026-05-04 and last updated on 2026-06-17.
References
- https://github.com/GreycLab/CImg/commit/c3aacf5b96ac1e54b7af1957c6737dbf3949f6d3
- https://github.com/GreycLab/CImg/issues/477
- https://github.com/GreycLab/CImg/releases/tag/v.3.7.5
- https://github.com/GreycLab/CImg/security/advisories/GHSA-g54r-qmgx-c6fv
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