ELA-1673-1 libpng1.6 security update

multiple vulnerabilities

2026-04-03
Packagelibpng1.6
Version1.6.36-6+deb10u3 (buster)
Related CVEs CVE-2026-33416 CVE-2026-33636


Two security vulnerabilities were discovered in libpng, a library implementing an interface for reading and writing PNG (Portable Network Graphics) files, which could result in denial of service or potentially the execution of arbitrary code.

CVE-2026-33416

Use-after-free via pointer aliasing in `png_set_tRNS` and `png_set_PLTE`, potentially allowing arbitrary code execution

CVE-2026-33636

Out-of-bounds read/write in the palette expansion on ARM Neon, potentially causing a crash (DoS)


For Debian 10 buster, these problems have been fixed in version 1.6.36-6+deb10u3.

We recommend that you upgrade your libpng1.6 packages.

Further information about Extended LTS security advisories can be found in the dedicated section of our website.