Vulnerability record

CVE-2025-59375

HighNo known exploitation

Patch status

No official fix confirmed yet

Until a fix ships, follow the vendor's mitigations, limit exposure of affected systems, and watch this record for a patch.

libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing.

Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.

Developments from the last 30 days, newest first.

CVSS scoredUpdateOct 6, 2026
CVE-2025-59375 scored CVSS 7.5
Basis: NIST National Vulnerability Database
DisclosedOct 6, 2026
Hitachi Energy REB500
Basis: CISA Cybersecurity Advisories (government advisory)

HighMitigate

Mitigate

No complete fix is indicated yet.

CISA Cybersecurity Advisories7 hours agoDevelopersCritical infra

github.com https://github.com/libexpat/libexpat/blob/676a4c531ec768732fac215da9730b5f50fbd2bf/expat/Changes#L45-L74
github.com https://github.com/libexpat/libexpat/blob/R_2_7_2/expat/Changes
github.com https://github.com/libexpat/libexpat/issues/1018
github.com https://github.com/libexpat/libexpat/pull/1034
issues.oss-fuzz.com https://issues.oss-fuzz.com/issues/439133977
openwall.com http://www.openwall.com/lists/oss-security/2025/09/16/2
openwall.com http://www.openwall.com/lists/oss-security/2026/05/01/5
cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-082556.html
cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-089022.html