CVE-2026-102559 libsoup - Buffer Overflow

libsoup contains a heap buffer overflow caused by size value truncation in GByteArray allocation during masked WebSocket client frame construction for large payloads, letting attackers cause memory corruption, exploit requires crafted large payload.

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
Remote Code Execution
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

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