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CVE-2026-107161

Cyrus-sasl: heap buffer overflow in cyrus-sasl add_to_challenge() allows malicious server to crash or compromise digest-md5 clients

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.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Cyrusimap Redhat
Products
Cyrus-sasl Enterprise Linux Hardened Images and 5 more
CVE-2022-24407

cyrus-sasl: failure to properly escape SQL input allows an attacker to execute arbitrary SQL commands

In Cyrus SASL 2.1.17 through 2.1.27 before 2.1.28, plugins/sql.c does not escape the password for a SQL INSERT or UPDATE statement.

CVSS 3.1 · 8.8 High EPSS 4.1% KEV · Not listed
Vendors
Cyrusimap Debian Fedoraproject and 3 more
Products
Cyrus-sasl Debian Linux Fedora and 11 more
CVE-2019-19906

cyrus-sasl: denial of service in _sasl_add_string function

cyrus-sasl (aka Cyrus SASL) 2.1.27 has an out-of-bounds write leading to unauthenticated remote denial-of-service in OpenLDAP via a malformed LDAP packet. The OpenLDAP crash is ultimately caused by an off-by-one error in _sasl_add_string in common.c in cyrus-sasl.

CVSS 3.1 · 7.5 High EPSS 8.0% KEV · Not listed
Vendors
Apache Apple Canonical and 5 more
Products
Bookkeeper Ipados Iphone Os and 17 more