Skip to content
Fencer Intel
medium 5.9

CVE-2026-113351 json

libexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserReset

published 20d ago modified 6d ago also EUVD-2026-104922

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

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.

Patch / fix

  • expat Debian 14 2.10.0-1

debian advisories DEBIAN-CVE-2026-113351

  • expat openSUSE Tumbleweed 2.10.0-1.1

opensuse advisories openSUSE-SU-2026:12396-1

  • expat Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 2.10.0-r0

alpine advisories ALPINE-CVE-2026-113351

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2026-113351 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-113351 updated cvss 5.9

expat: expat: Denial of Service via improper memory tracking in XML_ParserReset

  • Red Hat Enterprise Linux 8 expat, expat 2.7.3-1.el10_2.5 Red Hat Enterprise Linux 9 expat, expat 2.7.3-1.el10_2.5 Red Hat Enterprise Linux 10 expat 2.7.3-1.el10_2.5
    affected: workaround, no fix available
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-dashboard-rhel9
    under investigation
  • Red Hat Hardened Images expat 2.9.0-1.1.hum1
    fixed: vendor fix RHSA-2026:90325
  • Red Hat Enterprise Linux 6 expat, compat-expat1, expat 2.7.3-1.el10_2.5 Red Hat Enterprise Linux 7 expat, firefox, expat 2.7.3-1.el10_2.5, firefox 140.17.0-1.el10_2 Red Hat Enterprise Linux 8 firefox, xmlrpc-c, mingw-expat, thunderbird, xmlrpc-c-c++, mingw32-expat, +5 more Red Hat Enterprise Linux 9 firefox, firefox-x11, thunderbird, firefox 140.17.0-1.el10_2, thunderbird 140.17.0-1.el10_2 Red Hat Enterprise Linux 10 firefox 140.17.0-1.el10_2, thunderbird 140.17.0-1.el10_2 Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9
    +2 more products
    Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
20d ago

Exploit prediction

0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 4.0 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
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • libexpat libexpat

Classification

Weakness
  • CWE-909 Missing Initialization of Resource

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.