What is CVE-2026-33636?

CVE-2026-33636 is a high-severity vulnerability in Pnggroup Libpng, classified under Out-of-bounds Read. CVSS score: 7.6/10. Published 2026-03-26.

How severe is CVE-2026-33636?

High severity. CVSS v3 base score is 7.6 out of 10.

Out-of-bounds Read in Pnggroup Libpng

CVE-2026-33636

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write exists in libpng's ARM/AArch64 N…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (16.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H.

Affected products

Pnggroup Libpng — versions >= 1.6.36, < 1.6.56

Weakness classification (CWE)

References

https://github.com/pnggroup/libpng/security/advisories/GHSA-wjr5-c57x-95m2 (x_refsource_CONFIRM)
https://github.com/pnggroup/libpng/commit/7734cda20cf1236aef60f3bbd2267c97bbb40869 (x_refsource_MISC)
https://github.com/pnggroup/libpng/commit/aba9f18eba870d14fb52c5ba5d73451349e339c3 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-33636?: CVE-2026-33636 is a high-severity vulnerability in Pnggroup Libpng, classified under Out-of-bounds Read. CVSS score: 7.6/10. Published 2026-03-26.
How severe is CVE-2026-33636?: High severity. CVSS v3 base score is 7.6 out of 10.