CVE-2025-32908: Libsoup: denial of service on libsoup through http/2 server

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-04-14 · updated 2026-06-29
Weakness: CWE-115

Description

A flaw was found in libsoup. The HTTP/2 server in libsoup may not fully validate the values of pseudo-headers :scheme, :authority, and :path, which may allow a user to cause a denial of service (DoS).

Affected products

Red Hat Enterprise Linux 10: all versions — fixed in 0:3.6.5-3.el10_0

How to fix

Upgrade to a fixed version: Red Hat Enterprise Linux 10 0:3.6.5-3.el10_0. Check the vendor advisory for mitigations.

References

https://access.redhat.com/errata/RHSA-2025:7505
https://access.redhat.com/security/cve/CVE-2025-32908
https://bugzilla.redhat.com/show_bug.cgi?id=2359343
https://gitlab.gnome.org/GNOME/libsoup/-/issues/429
https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/451

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