CVE-2026-12548

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.

CVSS 3.1

4.2CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L

EPSS

0.3% chance of exploitation in the next 30 days; higher than 16% of CVEs (scores of 2026-10-25)

CWE

CWE-125

Published

2026-07-21

Modified

2026-10-24

Record from

the NVD, synced 2026-10-25

Affected

• gnome:libsoup
• redhat:enterprise_linux

References

• https://access.redhat.com/security/cve/CVE-2026-12548
• https://bugzilla.redhat.com/show_bug.cgi?id=2489996
• https://gitlab.gnome.org/GNOME/libsoup/-/work_items/512
• https://gitlab.gnome.org/GNOME/libsoup/-/work_items/512

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