Out-of-bounds Read in Libpng
CVE-2025-66293
LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to 1.6.52, an out-of-bounds read vulnerability in libpng's simplified API allows reading up to 1012 bytes beyond the png_sRGB_base[512] array when processing valid palette PNG images with partial transparency and gamma correction. The PNG files that trigger this vulnerability are valid per the PNG specification; the bug is in libpng's internal state management. Upgrade to libpng 1.6.52 or later.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (26.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Libpng
- Pnggroup Libpng — versions < 1.6.52
Weakness classification (CWE)
References
- github.com/pnggroup/libpng/security/advisories/GHSA-9mpm-9pxh-mg4f (Exploit, Vendor Advisory)
- github.com/pnggroup/libpng/issues/764 (Exploit, Patch, Issue Tracking)
- github.com/pnggroup/libpng/commit/788a624d7387a758ffd5c7ab010f1870dea753a1 (Patch)
- github.com/pnggroup/libpng/commit/a05a48b756de63e3234ea6b3b938b8f5f862484a (Patch)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List)
Frequently asked questions
- What is CVE-2025-66293?
- CVE-2025-66293 is a high-severity vulnerability in Libpng, classified under Out-of-bounds Read. CVSS score: 7.1/10. Published 2025-12-03.
- How severe is CVE-2025-66293?
- High severity. CVSS v3 base score is 7.1 out of 10.