Description
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.
Affected products
gnome: libsoup; redhat: enterprise linux
References4
- access.redhat.com/security/cve/CVE-2026-12548 Vendor Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2489996 ExploitIssue TrackingVendor Advisory
- gitlab.gnome.org/GNOME/libsoup/-/work_items/512 ExploitMitigationVendor Advisory
- gitlab.gnome.org/GNOME/libsoup/-/work_items/512 ExploitMitigationVendor Advisory
Metrics
- CVSS 3.1
-
4.2
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L - EPSS — exploit probability
- 0% percentile: 17 · as of 14 November 2026
- CWE
- CWE-125
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.