CVE-2026-102555: gnome libsoup Out-of-bounds Read

Vulnerability summary

CVE-2026-102555 is a high (CVSS 8.2) Out-of-bounds Read vulnerability in gnome libsoup. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 29.3% of scored vulnerabilities.

Timeline

1. 29-09-2026
   PublishedVulnerability first disclosed.
2. 15-10-2026
   Last modifiedVulnerability information updated.

Description

A flaw was found in libsoup. The soup_uri_decode_data_uri() function incorrectly treated base64 data-URI payloads as NUL-terminated strings when calling g_base64_decode_inplace(). If the percent-decoded payload contained embedded NUL bytes, the decoded length could remain uninitialized and be used as the size of the returned GBytes. This can lead to an out-of-bounds read or application crash when processing a crafted data URI.

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