What’s Vulnerable › Vulnerabilities

CVE-2026-25210

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-30 · updated 2026-06-17
• Weakness: CWE-190

Description

In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize because there is no integer overflow check for tag buffer reallocation.

Affected products

• libexpat project libexpat: before 2.7.4 — fixed in 2.7.4

How to fix

Upgrade to a fixed version: libexpat project libexpat 2.7.4. Check the vendor advisory for mitigations.

References

• https://github.com/libexpat/libexpat/pull/1075
• https://github.com/libexpat/libexpat/pull/1075/commits/9c2d990389e6abe2e44527eeaa8b39f16fe859c7
• https://cert-portal.siemens.com/productcert/html/ssa-253495.html

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