Out-of-bounds Read in GNOME Libsoup

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.

Vulnerability class: Buffer Overflow

EPSS: 0.004 (32.1th percentile) — read the EPSS interpretation.