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Message-ID: <96eb9370-0f79-45f5-9073-adab4693b192@pipping.org>
Date: Mon, 11 May 2026 22:43:24 +0200
From: Sebastian Pipping <sebastian@...ping.org>
To: oss-security@...ts.openwall.com
Subject: libexpat 2.8.1 fixes CVE-2026-45186 (denial of service)
Hello oss-security,
just a quick note that libexpat 2.8.1 (or "Expat 2.8.1") released
yesterday is fixing CVE-2026-45186:
Fix quadratic runtime from attribute name collision checks that
allowed denial of service attacks through moderately sized crafted
XML input (CWE-407).
Please note that a layer of compression around XML can significantly
reduce the minimum attack payload size.
Some key links are:
- The blog post about it
https://blog.hartwork.org/posts/expat-2-8-1-released/
- The change log of release 2.8.1
https://github.com/libexpat/libexpat/blob/R_2_8_1/expat/Changes
- The fixing pull request
https://github.com/libexpat/libexpat/pull/1216
- The NVD CVE metadata
https://nvd.nist.gov/vuln/detail/CVE-2026-45186
PS: The CVE database lists an unrealistically low CVSS score for this.
The complexity of an attack is very low (not "High") and the attack
vector is remote (not "Local"). I have asked Mitre to fix this
earlier today. My blog post linked above has a few more words on
that topic.
Best
Sebastian
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