CVE-2026-113351CWE-909

CVE-2026-113351

Medium · published October 20, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
40.0
In the wild
Unconfirmed
What it is

libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so later documents on the same reset parser fail with XML_ERROR_NO_MEMORY until it is recreated.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
8.2 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00474 · 40.0th percentile
Weakness
CWE-909 · Missing Initialization of Resource
Published
2026-10-20T15:17Z
References (5)
https://github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L860-L884 · [email protected]https://github.com/libexpat/libexpat/pull/1431 · [email protected]https://www.vulncheck.com/advisories/libexpat-2.7.2-through-2.9.0-denial-of-service-via-xml-parserreset · [email protected]https://github.com/libexpat/libexpat · [email protected]https://github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L1560 · [email protected]
EPSS history
Timeline
  • 22 OCT 03:29Z
    EPSS moved — → 0%
    epss
  • 20 OCT 10:41Z
    libexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserReset
    cvelistv5
  • 20 OCT 10:41Z
    libexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserReset
    cvelistv5