CVE-2026-41080 Denial of service in libexpat

What is CVE-2026-41080?

CVE-2026-41080 is a low-severity denial of service vulnerability in Libexpat Project Libexpat, published on 16 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

libexpat before 2.8.0 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document.

Weakness: CWE-331

Which versions are affected by CVE-2026-41080?

It affects 1 product.

Products include Libexpat Project Libexpat.

How do I fix CVE-2026-41080?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-41080 being exploited?

There is no known exploitation of CVE-2026-41080 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-2026-41080, AZL-82988, BELL-CVE-2026-41080, CLEANSTART-2026-UT95390, CLSA-2026-1780564364, CLSA-2026-1780578419 and 25 more.