Use After Free in Libpng
CVE-2026-33416
LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, `png_set_tRNS` and `png_set_PLTE` each alias a heap-allocated buf…
Vulnerability class: Use-After-Free
EPSS: 0.011 (60.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Libpng
- Pnggroup Libpng — versions >= 1.2.1, < 1.6.56
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
- security-advisories@github.com (Exploit, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-33416?
- CVE-2026-33416 is a high-severity vulnerability in Libpng, classified under Use After Free. CVSS score: 7.5/10. Published 2026-03-26.
- How severe is CVE-2026-33416?
- High severity. CVSS v3 base score is 7.5 out of 10.