CVE-2026-56132: Buffer Overflow
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 2.8.2-1 - Upgrade
Upgrade
debian/expatto a version that resolves this vulnerability.Fixed in 2.8.3-1~deb13u1Fixed in 2.8.4-1Fixed in 2.8.4-2 - Upgrade
Upgrade
libexpatto a version that resolves this vulnerability.Fixed in 2.8.2
Event History
Frequently Asked Questions
What is the severity of CVE-2026-56132?
The severity of CVE-2026-56132 is medium, with a CVSS score of 6.9.
What type of vulnerability is CVE-2026-56132?
CVE-2026-56132 is a heap-based buffer overflow vulnerability.
How do I fix CVE-2026-56132?
To fix CVE-2026-56132, update to libexpat version 2.8.2 or later.
What causes the vulnerability in CVE-2026-56132?
The vulnerability is caused by mishandled reallocation of the scaffold backing array when there is data-structure sharing across parsers.
Which software is affected by CVE-2026-56132?
CVE-2026-56132 affects libexpat versions prior to 2.8.2.