CVE-2024-45490 Integer overflow in n/a

Critical 9.8 Published 30 Aug 2024 Updated 15 Oct 2026

An integer overflow in libexpat allows attackers to cause a denial of service via negative length inputs in XML_ParseBuffer.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2024-45490?

CVE-2024-45490 is a critical vulnerability in Libexpat Project Libexpat, published on 30 Aug 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in libexpat before 2.6.3. xmlparse.c does not reject a negative length for XML_ParseBuffer.

Weakness: CWE-611, CWE-190

Which versions are affected by CVE-2024-45490?

It affects 1 product.

Products include Libexpat Project Libexpat.

How do I fix CVE-2024-45490?

Upgrade to a fixed version.

Is CVE-2024-45490 being exploited?

There is no known exploitation of CVE-2024-45490 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

All Libexpat Project Libexpat vulnerabilities

Sources

Also known as ALPINE-CVE-2024-45490, AZL-48369, AZL-48372, BELL-CVE-2024-45490, CLEANSTART-2026-GS34408, CLSA-2025-1761902260 and 5 more.