CVE-2026-115506

libexpat through 2.9.0 Denial of Service via Billion Laughs Detection Delay

CVE-2026-115506 is fixed in 8 products on 1 platform, first by DEBIAN-CVE-2026-115506, released November 9, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.5

Important

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0045

39th percentile

mingw-expat: expat: Denial of Service via delayed entity amplification detection

Where it's fixed

Product	Fixed in	Fix	Released
Linux
expat · Debian 14	2.10.0-1	DEBIAN-CVE-2026-115506	Nov 9, 2026
mingw-expat · Fedora 43	2.9.0-1.fc43	FEDORA-2026-A83294F5AB	Nov 9, 2026
mingw32-expat · Fedora 43	2.9.0-1.fc43	FEDORA-2026-A83294F5AB	Nov 9, 2026
mingw32-expat-debuginfo · Fedora 43	2.9.0-1.fc43	FEDORA-2026-A83294F5AB	Nov 9, 2026
mingw32-expat-static · Fedora 43	2.9.0-1.fc43	FEDORA-2026-A83294F5AB	Nov 9, 2026
mingw64-expat · Fedora 43	2.9.0-1.fc43	FEDORA-2026-A83294F5AB	Nov 9, 2026
mingw64-expat-debuginfo · Fedora 43	2.9.0-1.fc43	FEDORA-2026-A83294F5AB	Nov 9, 2026
mingw64-expat-static · Fedora 43	2.9.0-1.fc43	FEDORA-2026-A83294F5AB	Nov 9, 2026

Details

Published
October 22, 2026
Weakness
Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-115506

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