CVE-2025-4969 Libsoup: off-by-one out-of-bounds read in find_boundary() in soup-multipart.c
A remote attacker can trigger an out-of-bounds read in libsoup via crafted multipart HTTP messages, potentially causing crashes or leaking memory.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-4969?
CVE-2025-4969 is a medium-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 21 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was found in the libsoup package. This flaw stems from its failure to correctly verify the termination of multipart HTTP messages. This can allow a remote attacker to send a specially crafted multipart HTTP body, causing the libsoup-consuming server to read beyond its allocated memory boundaries (out-of-bounds read).
Weakness: CWE-125
Which versions are affected by CVE-2025-4969?
How do I fix CVE-2025-4969?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-4969 being exploited?
There is no known exploitation of CVE-2025-4969 in the wild and no public exploit code.
Sources
Also known as AZL-61945, AZL-61958, DEBIAN-CVE-2025-4969, GHSA-ff3g-4fq3-jf4p, ROOT-OS-DEBIAN-12-CVE-2025-4969, UBUNTU-CVE-2025-4969.