CVE-2026-102558 libsoup - Buffer Overflow

libsoup contains a heap buffer overflow caused by an integer wrap in SoupWebsocketConnection when max-incoming-payload-size is unlimited (0), letting attackers cause memory corruption, exploit requires attacker to send crafted websocket frames.

CVSS base score 8.6 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.30% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
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 with the fix applied.

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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