Description
An out-of-bounds read vulnerability was found in libsoup's multipart processing subsystem. The flaw exists in the soup_multipart_input_stream_read_headers() function inside soup-multipart-input-stream.c, which does not adequately restrict or validate the size of incoming multipart boundary strings. When processing a crafted HTTP response containing a malformed or oversized boundary parameter, the internal stream reader reads past the allocated buffer bounds. A remote, unauthenticated attacker can exploit this behavior to cause a service denial (DoS) through application failure or potentially read fragments of unauthorized memory metadata.
Problem types
Product status
Timeline
| 2026-07-14: | Reported to Red Hat. |
| 2026-07-14: | Made public. |
Credits
Red Hat would like to thank cavid for reporting this issue.
References
access.redhat.com/security/cve/CVE-2026-15714
bugzilla.redhat.com/show_bug.cgi?id=2499942 (RHBZ#2499942)
gitlab.gnome.org/GNOME/libsoup/-/work_items/542