Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-07-14T10:20:00 libsoup: SoupMultipartInputStream: libsoup: Out-of-bounds read in soup_multipart_input_stream_read_headers via an oversized multipart boundary string 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L CWE-125

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.

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.

This vulnerability presents a moderate risk to confidentiality and availability for software implementations implementing libsoup for multipart payload handling. Because the memory tracking misalignment happens during the automated header ingestion phase, an attacker can seamlessly induce a crash remotely without needing local context or user interaction. Red Hat Product Security ranks this as a notable security regression within parsing utilities, though impact vectors generally manifest as localized client or server session instability rather than complete remote code execution. Red Hat would like to thank cavid for reporting this issue. To mitigate this issue, restrict network access to applications that utilize libsoup for processing multipart messages from untrusted sources. Implement firewall rules to limit incoming connections to only trusted clients, thereby reducing the attack surface. If the vulnerable component is part of a service, ensure that the service is not exposed to untrusted networks. Red Hat Enterprise Linux 10 Fix deferred libsoup3 Red Hat Enterprise Linux 6 Out of support scope libsoup Red Hat Enterprise Linux 7 Out of support scope libsoup Red Hat Enterprise Linux 8 Fix deferred libsoup Red Hat Enterprise Linux 9 Fix deferred libsoup https://www.cve.org/CVERecord?id=CVE-2026-15714 https://nvd.nist.gov/vuln/detail/CVE-2026-15714 https://gitlab.gnome.org/GNOME/libsoup/-/work_items/542