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.
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Affected Vendors & Products
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History
Sat, 10 Oct 2026 03:30:00 +0000
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ssvc
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Fri, 09 Oct 2026 23:30:00 +0000
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Fri, 09 Oct 2026 09:15:00 +0000
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Cyrusimap
Cyrusimap cyrus-sasl Redhat hardened Images Redhat openshift Container Platform |
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Cyrusimap
Cyrusimap cyrus-sasl Redhat hardened Images Redhat openshift Container Platform |
Thu, 08 Oct 2026 12:15:00 +0000
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threat_severity
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threat_severity
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Wed, 07 Oct 2026 19:45:00 +0000
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| 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 |
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| 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 |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: redhat
Published: 2026-10-07T19:29:28.164Z
Updated: 2026-10-10T02:42:51.112Z
Reserved: 2026-10-07T11:00:41.139Z
Link: CVE-2026-107161
Updated: 2026-10-09T22:07:16.666Z
Status : Awaiting Analysis
Published: 2026-10-07T20:17:10.977
Modified: 2026-10-10T03:17:05.307
Link: CVE-2026-107161