AIKIDO-2026-826518
libxml2 is vulnerable to Stack-based Buffer Overflow
20
Low Risk
This Affects:
libxml2TL;DR
Affected versions of libxml2 have stack-based buffer overflows in the xmlcatalog utility's usershell() function when --shell mode is used. User input is copied into fixed-size command, arg, and argv stack buffers with no bounds checks, so a long input line can corrupt the stack. That can crash the xmlcatalog process and, in constrained cases, allow code execution in that process.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you run xmlcatalog --shell with untrusted input.
Background info
libxml2 is vulnerable to Stack-based Buffer Overflow in versions 2.4.3 - 2.15.3.
How to fix this
Upgrade the libxml2 library to the patch version.
Links
gitlab.gnome.org/GNOME/libxml2/-/releases/v2.15.4cert.pl/en/posts/2026/06/CVE-2026-11979gitlab.gnome.org/GNOME/libxml2/-/commit/c2e233fc1b341685fc99621b2768b503f777a72e
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