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5.9

libexpat XML Parsing: Use-After-Free Risk

published 2 months ago
Summary

libexpat versions before 2.8.2 may cause a use-after-free error when parsing XML, potentially leading to a crash or security issue. This issue affects any software that uses libexpat for XML parsing. To protect your system, update to a version of libexpat 2.8.2 or later.

What to do
  • Update juliabinarywrappers expat_jll to version 2.8.2+0.
Affected software
Ecosystem VendorProductAffected versions
Julia juliabinarywrappers expat_jll < 2.8.2+0
Fix: upgrade to 2.8.2+0
Original advisory text
libexpat before 2.8.2 lacks handler call depth tracking for calls to `XML_GetBuffer`, `XML_Parse`, `XML_ParseBuffer`, `XML_ParserFree`, or `XML_ParserReset` from within handlers in cases of a polic...
libexpat before 2.8.2 lacks handler call depth tracking for calls to `XML_GetBuffer`, `XML_Parse`, `XML_ParseBuffer`, `XML_ParserFree`, or `XML_ParserReset` from within handlers in cases of a policy violation. Thus, a use-after-free can occur,
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
5.9 Medium
Timeline
Published9 Aug 2026
Updated9 Aug 2026
First seen9 Aug 2026
Sources
JLSEC-2026-1224 · OSV
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