CVE-2026-107161 Cyrus SASL - Buffer Overflow

Cyrus SASL contains a heap-based buffer overflow caused by incorrect buffer size calculation in the DIGEST-MD5 plugin's add_to_challenge() function, letting malicious or on-path servers crash the client by supplying crafted challenge fields, exploit requires attacker-controlled server.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.28% 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:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
7 October 2026
Updated
15 October 2026
Weakness
CWE-122

Vendor fix

Update to the latest version with the buffer overflow 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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