CVE-2026-24515 Null dereference in libexpat

What is CVE-2026-24515?

CVE-2026-24515 is a low-severity vulnerability in Libexpat Project Libexpat, published on 23 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In libexpat before 2.7.4, XML_ExternalEntityParserCreate does not copy unknown encoding handler user data.

Weakness: CWE-476

Which versions are affected by CVE-2026-24515?

It affects 1 product.

Products include Libexpat Project Libexpat.

How do I fix CVE-2026-24515?

Upgrade to a fixed version.

Is CVE-2026-24515 being exploited?

There is no known exploitation of CVE-2026-24515 in the wild and no public exploit code.

Other vulnerabilities in Libexpat Project Libexpat

• CVE-2024-45490 Integer overflow in n/a Critical 9.8
• CVE-2026-66046 Expat Denial of Service via storeAtts() Quadratic Complexity High 8.7
• CVE-2021-46143 Integer overflow in n/a High 8.1
• CVE-2017-11742 Privilege escalation in n/a High 7.8
• CVE-2025-59375 Denial of service in libexpat High 7.5

All Libexpat Project Libexpat vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2026-24515, AZL-75102, AZL-75216, BELL-CVE-2026-24515, CLEANSTART-2026-CR32311, CLSA-2026-1770394049 and 22 more.