CVE-2026-56132

Vendorlibexpat projectProductlibexpatDiscoveredJun 19, 2026UpdatedOct 26, 2026

In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.

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CVSS v3.1

6.9 MEDIUM

EPSS

0.14%

probability of exploitation in 30 days

CISA KEV

Not listed

no confirmed exploitation reported

News coverage

sources referencing this CVE

Related IOCs

seen in the same coverage

Intelligence Reports1

1 intelligence report available

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EPSS Trend

Aug 26, 2026 → Oct 26, 2026

▲ 0.03pp

0.11% → 0.14% over 5 tracked changes

CVSS v3.1 Detail

Attack VectorLOCAL

Attack ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

ScopeUNCHANGED

ConfidentialityHIGH

IntegrityHIGH

AvailabilityLOW

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

Connections

3 relationships

libexpat

source

Timeline

disclosure → media coverage

Jun 19, 2026

Disclosure — published as a CVE record. · last revised by NVD Oct 26, 2026

Sep 24, 2026

ubuntu.com reports: USN-8813-1: Expat vulnerabilities