CVE-2026-76957

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.

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CVSS v3.1

4.9 MEDIUM

EPSS

0.11%

probability of exploitation in 30 days

CISA KEV

Not listed

no confirmed exploitation reported

News coverage

sources referencing this CVE

Intelligence Reports1

1 intelligence report available

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EPSS Trend

Aug 21, 2026 → Sep 10, 2026

● 0.00pp

0.10% → 0.11% over 3 tracked changes

CVSS v3.1 Detail

Attack VectorLOCAL

Attack ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

ScopeUNCHANGED

ConfidentialityLOW

IntegrityLOW

AvailabilityLOW

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

Connections

2 relationships

CWE-416

source

Timeline

disclosure → media coverage

Aug 20, 2026

Disclosure — published as a CVE record. · last revised by NVD Sep 8, 2026