CVE-2026-56403

Name of the Vulnerable Software and Affected Versions libexpat versions prior to 2.8.2

Description An integer overflow exists in the storeAtts() function. An integer overflow occurs when an arithmetic operation attempts to create a numeric value that is outside of the range that can be represented with a given number of bits.

Recommendations Update to version 2.8.2 or later. As a temporary workaround, restrict the use of the storeAtts() function until the update is applied.