CVE-2024-28757 Denial of service in n/a

High 7.5 Published 10 Mar 2024 Updated 15 Oct 2026

Attackers can cause denial of service via XML Entity Expansion in libexpat when using isolated external parsers.

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

What is CVE-2024-28757?

CVE-2024-28757 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 10 Mar 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).

Weakness: CWE-776

Which versions are affected by CVE-2024-28757?

It affects 14 products.

Linux distribution packages (7)

`expat-debuginfo` Red Hat:enterprise_linux:9::appstream	All versions	`0:2.5.0-2.el9_4`
`expat-debugsource` Red Hat:enterprise_linux:9::appstream	All versions	`0:2.5.0-2.el9_4`
`expat-devel` Red Hat:enterprise_linux:9::appstream	All versions	`0:2.5.0-2.el9_4`
`expat` Red Hat:enterprise_linux:9::baseos	All versions	`0:2.5.0-2.el9_4`
`expat-debuginfo` Red Hat:enterprise_linux:9::baseos	All versions	`0:2.5.0-2.el9_4`
`expat-debugsource` Red Hat:enterprise_linux:9::baseos	All versions	`0:2.5.0-2.el9_4`
`expat` openSUSE:Tumbleweed	All versions	`2.6.2-1.1`

Products include Fedoraproject Fedora, Libexpat Project Libexpat, Netapp Active Iq Unified Manager, Netapp H300s Firmware, Netapp H410c Firmware, Netapp H410s Firmware and 8 more.

How do I fix CVE-2024-28757?

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-2024-28757 being exploited?

There is no known exploitation of CVE-2024-28757 in the wild and no public exploit code.

Public exploit code: 2 proofs of concept on GitHub.

All Fedoraproject Fedora vulnerabilities

Sources

Also known as ALPINE-CVE-2024-28757, AZL-35841, AZL-35880, BELL-CVE-2024-28757, CLEANSTART-2026-UG42747, CLSA-2025-1741291038 and 8 more.