CVE-2026-102558

A flaw was found in libsoup. When max-incoming-payload-size is unlimited (0), SoupWebsocketConnection could grow its incoming GByteArray based on an attacker-controlled frame length until the length wrapped, causing a heap buffer overflow while reading frame data.

  • Published Sep 29, 2026
  • CVSS 8.6 high
  • 0.3% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-102558 at the National Vulnerability Database