CVE-2026-12548: gnome libsoup Out-of-bounds Read

Vulnerability summary

CVE-2026-12548 is a medium (CVSS 4.2) Out-of-bounds Read vulnerability in gnome libsoup. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 15.9% of scored vulnerabilities. 2 public exploits are recorded.

Timeline

1. 21-07-2026
   PublishedVulnerability first disclosed.
2. 23-07-2026
   Last modifiedVulnerability information updated.

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.

• CWE-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.