CVE-2025-4969: Libsoup: off-by-one out-of-bounds read in find_boundary() in soup-multipart.c

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-21 · updated 2026-06-30
Weakness: CWE-125

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).

Affected products

Red Hat Enterprise Linux 10: all versions
Red Hat Enterprise Linux 9: all versions

References

https://access.redhat.com/security/cve/CVE-2025-4969
https://bugzilla.redhat.com/show_bug.cgi?id=2367552
https://gitlab.gnome.org/GNOME/libsoup/-/issues/447

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