CVE-2026-102556 libsoup - Denial of Service

libsoup contains a heap corruption vulnerability caused by emitting the ::pong signal with a GByteArray pointer instead of GBytes in SoupWebsocketConnection, letting attackers cause crashes or memory corruption via crafted Pong frames, exploit requires crafted WebSocket Pong frames.

CVSS base score 8.6 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.22% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Published
29 September 2026
Updated
15 October 2026
Weakness
CWE-843

Vendor fix

Update to the latest version of libsoup containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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