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CVE-2026-117610

7.5, high

libexpat NULL Pointer Dereference Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.5, high high CVSS v3.1
EPSS, next 30 days
0.4% higher than 36.8% of scored CVEs
Exploitation
No public evidence
Published
28 Oct 20266 days ago

Description

libexpat through 2.9.0 contains a NULL pointer dereference vulnerability in externalEntityInitProcessor2() in lib/xmlparse.c that mishandles the XML_TOK_NONE token from empty input. Attackers who control stream chunking can force an empty non-final first parse on an external entity subparser, causing a later parse to crash the application.

Details

Vendor
Libexpat
Product
libexpat
Weakness
CWE-476 (opens in a new tab)
Status
Analyzed
Updated
2 Nov 2026
Assigner
disclosure@vulncheck.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References 5

Patches and fixes 3

Other references 2

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Libexpat CVEs

Every Libexpat CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-118370 libexpat Integer Overflow Vulnerability EPSS 0.4% 8.2, high
  • CVE-2026-115506 libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in… EPSS 0.5% 7.5, high
  • CVE-2026-77214 libexpat Out-of-Bounds Read Vulnerability EPSS 0.3% 8.2, high

Beyond this page

Is CVE-2026-117610 in your network?

This page tells you how dangerous CVE-2026-117610 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-117610 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 3 Nov 2026, not the live upstream state.