AIKIDO-2026-826518
libxml2 is vulnerable to Stack-based Buffer Overflow
20
CVE Score
Low
Stack-based Buffer Overflow
TL;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.
How do I fix this?
Upgrade the libxml2 library to the patch version.
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.
Package
libxml2Versions
2.4.3 - 2.15.3
Fixed in 2.15.4Background info
libxml2 is vulnerable to Stack-based Buffer Overflow in versions 2.4.3 - 2.15.3.
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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