Debian 11 DLA-4521-1 libpng1.6 Critical Exploit DDoS CVE-2026-33416
debian lts
April 2, 2026
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 den...
Topics Covered
Summary
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 11 bullseye, these problems have been fixed in version
1.6.37-3+deb11u3.
We recommend that you upgrade your libpng1.6 packages.
For the detailed security status of libpng1.6 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/libpng1.6
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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Package: libpng1.6
Version: 1.6.37-3+deb11u3
CVE ID: CVE-2026-33416 CVE-2026-33636
Debian Bug: 1132012 1132013
Topics Covered
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