A heap out-of-bounds read flaw was found in libsoup. When parsing multipart HTTP messages, an integer type mismatch between the caller and soup_headers_parse() can cause the length parameter to be incorrectly truncated, leading to a heap buffer over-read. A remote attacker could use this flaw to crash an application using libsoup or potentially disclose heap memory contents.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://access.redhat.com/security/cve/CVE-2026-12548 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2489996 Exploit, Issue Tracking, Vendor Advisory
- https://gitlab.gnome.org/GNOME/libsoup/-/work_items/512 Exploit, Mitigation, Vendor Advisory
- https://gitlab.gnome.org/GNOME/libsoup/-/work_items/512 Exploit, Mitigation, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 4.2 · gnome, redhatNVD modified 2026-10-24 19:10
Affected (CPE criteria) 2
cpe:2.3:a:gnome:libsoup:-:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*
References 4
- https://access.redhat.com/security/cve/CVE-2026-12548 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2489996 Exploit, Issue Tracking, Vendor Advisory
- https://gitlab.gnome.org/GNOME/libsoup/-/work_items/512 Exploit, Mitigation, Vendor Advisory
- https://gitlab.gnome.org/GNOME/libsoup/-/work_items/512 Exploit, Mitigation, Vendor Advisory