CVE-2026-102557: gnome libsoup Out-of-bounds Read

Vulnerability summary

CVE-2026-102557 is a high (CVSS 8.6) Out-of-bounds Read vulnerability in gnome libsoup. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 18.5% of scored vulnerabilities.

Timeline

1. 29-09-2026
   PublishedVulnerability first disclosed.
2. 19-10-2026
   Last modifiedVulnerability information updated.

Description

A flaw was found in libsoup. When reassembling fragmented WebSocket messages into a GByteArray, libsoup did not adequately cap total message size against the limits of the underlying buffer type. A remote peer could send fragments that caused size truncation while the implementation still used the full length, leading to heap corruption or a crash.

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