CVE-2026-76957

7.8 highEPSS 0.1%

High (7.8) in libexpat project libexpat. EPSS 0.1% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

7.8 high

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

EPSS: 0.1% chance of exploitation in the next 30 days; higher than 1% of CVEs (scores of 2026-10-31)
CWE: CWE-416
Published: 2026-08-20
Modified: 2026-09-08
Record from: the NVD, synced 2026-10-19

Affected

libexpat_project:libexpat

References

https://github.com/libexpat/libexpat/pull/1322
https://github.com/libexpat/libexpat/pull/1329

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