Quick answers
- Is CVE-2026-102556 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-102556 being exploited in the wild.
- How severe is CVE-2026-102556?
- High severity, with a CVSS score of 8.6, published 29 September 2026.
- Which products and versions are affected?
- GNOME libsoup.
- Is there a fix for CVE-2026-102556?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-102556 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-102556?
- Check whether you run Gnome Libsoup. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A type confusion vulnerability exists in SoupWebsocketConnection's handling of incoming WebSocket Pong frames. The code passes a GByteArray pointer to the ::pong signal handler, but the signal is declared to accept GBytes, causing heap corruption or crash when a handler follows the documented API. Exploitation requires a remote network peer sending a crafted Pong frame to an application with a custom ::pong handler connected.
Affected products
- GNOME libsoup
Timeline
- 2026-09-29: disclosed