Vulnerability · Published Jul 14, 2026 · Assigned by redhat
CVE-2026-15714Libsoup: soupmultipartinputstream: libsoup: out-of-bounds read in soup_multipart_input_stream_read_headers via an oversized multipart boundary string
Medium 6.5
In plain English
A medium-severity out-of-bounds read in Red Hat Enterprise Linux 10 from Red Hat. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libsoup2.4 | no fix listed | DEBIAN-CVE-2026-15714 |
| Debian:13 | libsoup2.4 | no fix listed | DEBIAN-CVE-2026-15714 |
| Debian:12 | libsoup3 | no fix listed | DEBIAN-CVE-2026-15714 |
| Debian:13 | libsoup3 | no fix listed | DEBIAN-CVE-2026-15714 |
| Ubuntu:22.04:LTS | libsoup2.4 | no fix listed | UBUNTU-CVE-2026-15714 |
| Ubuntu:24.04:LTS | libsoup2.4 | no fix listed | UBUNTU-CVE-2026-15714 |
| Ubuntu:26.10 | libsoup2.4 | no fix listed | UBUNTU-CVE-2026-15714 |
| Ubuntu:24.04:LTS | libsoup3 | no fix listed | UBUNTU-CVE-2026-15714 |
| Ubuntu:26.04:LTS | libsoup3 | no fix listed | UBUNTU-CVE-2026-15714 |
| Ubuntu:26.10 | libsoup3 | no fix listed | UBUNTU-CVE-2026-15714 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
References
- https://access.redhat.com/security/cve/CVE-2026-15714 vdb-entry, x_refsource_REDHAT
- RHBZ#2499942 issue-tracking, x_refsource_REDHAT
- https://gitlab.gnome.org/GNOME/libsoup/-/work_items/542