CVE-2026-102557 libsoup - Out of Bounds Read/Write

libsoup contains a heap corruption caused by improper size capping when reassembling fragmented WebSocket messages into a GByteArray, letting remote attackers cause crashes or memory corruption, exploit requires sending crafted WebSocket fragments.

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
Out of Bounds Read/Write
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-125

Vendor fix

Update to the latest version of libsoup.

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

← All CVEs