CVE-2026-76957

At a glance

Severity: MEDIUM 4.9
EPSS: EPSS 0.11 % · percentile 1 (2026-10-27)
State: PUBLISHED
Published: 2026-08-20
Updated: 2026-08-20
Assigner: mitre
NVD status: Analyzed

Description

libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 4.9	CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L	mitre
CVSS 3.1	MEDIUM 4.9	CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L	NVD · cve@mitre.org (Secondary)
CVSS 3.1	HIGH 7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	NVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

CWE-416

European references

ENISA EUVD · EUVD-2026-63196
GCVE · GCVE-0-2026-76957

CERT-FR advisories

CERTFR-2026-AVI-1390 — Multiples vulnérabilités dans Tenable Network Monitor · cert.ssi.gouv.fr
CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:* < 2.8.4

Affected products

Product	Versions
libexpat project · libexpat	affected 0 < 2.8.4

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD