CVE WatchOct 10, 2026

CVE-2026-107161

A heap-based buffer overflow flaw was found in Cyrus SASL. The add_to_challenge() function in the DIGEST-MD5 plugin computes the size of the

CVSS

7.5

High

EPSS

0.3%

p19

KEV

—

Exploit Today

0-100

Published: Oct 7, 2026 · Last modified: Oct 10, 2026 · CWE-122

EPSS · 30d

0.2%EPSS · 30 days0.3%

2026-10-082026-10-23

Technical description

A heap-based buffer overflow flaw was found in Cyrus SASL. The add_to_challenge() function in the DIGEST-MD5 plugin computes the size of the buffer needed for a challenge/response field before DIGEST-MD5 quoting is applied, but does not recompute that size when quoting (escaping special characters) makes the value longer. The under-sized buffer is then passed to strcat(), causing a heap-based out-of-bounds write whose size depends on attacker-controlled input. A malicious or on-path DIGEST-MD5 (or HTTP Digest) server can trigger this flaw in a connecting client by supplying a crafted challenge field, such as realm or nonce, most likely resulting in a crash of the client application.

Official references

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