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Solution
No solution given by the vendor.
Workaround
If DIGEST-MD5 authentication is not strictly required, remove the optional cyrus-sasl-md5 package to eliminate the vulnerable plugin: # dnf remove cyrus-sasl-md5 Alternatively, configure client applications to disable DIGEST-MD5 and HTTP Digest authentication methods, prioritizing stronger mechanisms such as GSSAPI or SCRAM. Caveat: Removing cyrus-sasl-md5 removes support for both DIGEST-MD5 and CRAM-MD5 mechanisms. Any client or server process depending on these algorithms will fail to negotiate authentication. Active services utilizing SASL may need to be restarted to unload the plugin from memory.
Wed, 07 Oct 2026 19:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Cyrus-sasl: heap buffer overflow in cyrus-sasl add_to_challenge() allows malicious server to crash or compromise digest-md5 clients | |
| First Time appeared |
Redhat
Redhat enterprise Linux Redhat hummingbird Redhat openshift |
|
| Weaknesses | CWE-122 | |
| CPEs | cpe:/a:redhat:hummingbird:1 cpe:/a:redhat:openshift:4 cpe:/o:redhat:enterprise_linux:10 cpe:/o:redhat:enterprise_linux:6 cpe:/o:redhat:enterprise_linux:7 cpe:/o:redhat:enterprise_linux:8 cpe:/o:redhat:enterprise_linux:9 |
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| Vendors & Products |
Redhat
Redhat enterprise Linux Redhat hummingbird Redhat openshift |
|
| References |
| |
| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-10-07T19:29:28.164Z
Reserved: 2026-10-07T11:00:41.139Z
Link: CVE-2026-107161
No data.
Status : Received
Published: 2026-10-07T20:17:10.977
Modified: 2026-10-07T20:17:10.977
Link: CVE-2026-107161
No data.
OpenCVE Enrichment
Updated: 2026-10-07T21:00:14Z