Vulnerability-Lookup

SUSE-SU-2026:24380-1

Vulnerability from csaf_suse - Published: 2026-10-22 07:36 - Updated: 2026-10-27 13:11

Summary

Security update for cyrus-sasl

Severity

Important

Notes

Title of the patch: Security update for cyrus-sasl

Description of the patch: This update for cyrus-sasl fixes the following issues: Security issue fixed: - CVE-2026-107161: Heap buffer overflow in cyrus-sasl add_to_challenge() allows malicious server to crash or compromise DIGEST-MD5 clients (bsc#1284687). Non security issues fixed: - Fix cyrus-sasl package failing to build with GCC 14 (bsc#1221863). - Replace insecure MD5 with ephemeral HMAC-SHA256 (bsc#1247498). - Make DIGEST-MD5 work with openssl3 (bsc#1230111).

Patchnames: SUSE-SLE-Micro-6.1-763

CVE-2026-107161

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Recommended 16 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Micro 6.1:cyrus-sasl-0:2.1.28-slfo.1.1_2.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:cyrus-sasl-0:2.1.28-slfo.1.1_2.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:cyrus-sasl-0:2.1.28-slfo.1.1_2.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:cyrus-sasl-0:2.1.28-slfo.1.1_2.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:cyrus-sasl-digestmd5-0:2.1.28-slfo.1.1_2.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:cyrus-sasl-digestmd5-0:2.1.28-slfo.1.1_2.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:cyrus-sasl-digestmd5-0:2.1.28-slfo.1.1_2.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:cyrus-sasl-digestmd5-0:2.1.28-slfo.1.1_2.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:cyrus-sasl-gssapi-0:2.1.28-slfo.1.1_2.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:cyrus-sasl-gssapi-0:2.1.28-slfo.1.1_2.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:cyrus-sasl-gssapi-0:2.1.28-slfo.1.1_2.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:cyrus-sasl-gssapi-0:2.1.28-slfo.1.1_2.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libsasl2-3-0:2.1.28-slfo.1.1_2.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libsasl2-3-0:2.1.28-slfo.1.1_2.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libsasl2-3-0:2.1.28-slfo.1.1_2.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libsasl2-3-0:2.1.28-slfo.1.1_2.1.x86_64	—	Vendor Fix

Threats

Impact important

References

12 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://www.suse.com/support/update/announcement/…	self
https://bugzilla.suse.com/1221863	self
https://bugzilla.suse.com/1230111	self
https://bugzilla.suse.com/1233529	self
https://bugzilla.suse.com/1247498	self
https://bugzilla.suse.com/1284687	self
https://www.suse.com/security/cve/CVE-2026-107161/	self
https://www.suse.com/security/cve/CVE-2026-107161	external
https://bugzilla.suse.com/1284687	external

JSON

To clipboard

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}

CVE-2026-107161 (GCVE-0-2026-107161)

Vulnerability from cvelistv5 – Published: 2026-10-07 19:29 – Updated: 2026-10-10 02:42

Title

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

Summary

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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-10 02:42 UTC

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1055 records in the last 180 days details

References

3 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-107161	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2460420	issue-trackingx_refsource_REDHAT
http://www.openwall.com/lists/oss-security/2026/1…

Impacted products

7 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat Hardened Images	cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Date Public

2026-10-07 17:53

Credits

This issue was discovered by Bruno Fournier and Found by AISLE in partnership with Red Hat.

Show details on NVD website

JSON

To clipboard

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      "credits": [
        {
          "lang": "en",
          "value": "This issue was discovered by Bruno Fournier and Found by AISLE in partnership with Red Hat."
        }
      ],
      "datePublic": "2026-10-07T17:53:01.497Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "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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            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
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          "url": "https://access.redhat.com/security/cve/CVE-2026-107161"
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          "lang": "en",
          "time": "2026-04-21T23:18:32.000Z",
          "value": "Reported to Red Hat."
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        {
          "lang": "en",
          "time": "2026-10-07T17:53:01.497Z",
          "value": "Made public."
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      "title": "Cyrus-sasl: heap buffer overflow in cyrus-sasl add_to_challenge() allows malicious server to crash or compromise digest-md5 clients",
      "workarounds": [
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          "lang": "en",
          "value": "If DIGEST-MD5 authentication is not strictly required, remove the optional cyrus-sasl-md5 package to eliminate the vulnerable plugin:\n\n# dnf remove cyrus-sasl-md5\n\nAlternatively, configure client applications to disable DIGEST-MD5 and HTTP Digest authentication methods, prioritizing stronger mechanisms such as GSSAPI or SCRAM.\n\nCaveat: 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."
        }
      ],
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        "engine": "cvelib 1.8.0"
      },
      "x_redhatCweChain": "CWE-122: Heap-based Buffer Overflow"
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  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2026-107161",
    "datePublished": "2026-10-07T19:29:28.164Z",
    "dateReserved": "2026-10-07T11:00:41.139Z",
    "dateUpdated": "2026-10-10T02:42:51.112Z",
    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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