VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVPublished CVSS 7.5 highEPSS 0.3% probability of exploitation in 30 daysFound by AI: AISLE
Red Hat

CVE-2026-107161: Cyrus-sasl: heap buffer overflow in cyrus-sasl add_to_challenge() allows malicious server to crash or compromise digest-md5 clients

Is it exploited?

Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.

How likely is exploitation in the next 30 days?
0.3%

EPSS score, percentile 27.1 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?
7.5 High

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Versions by product

Source: CISA KEV 2026.10.29, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

What to do

Workaround (from the CVE record)

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.

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

As listed in the CVE record.

Red Hat Red Hat Enterprise Linux 10
StatusVersions

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 6
StatusVersions

Versions not listed are: unknown.

Red Hat Red Hat Enterprise Linux 7
StatusVersions

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8
StatusVersions

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 9
StatusVersions

Versions not listed are: affected.

Red Hat Red Hat Hardened Images
StatusVersions

Versions not listed are: affected.

Red Hat Red Hat OpenShift Container Platform 4
StatusVersions

Versions not listed are: unaffected.

Red Hat Red Hat OpenShift Container Platform 4
StatusVersions

Versions not listed are: unaffected.

Source: CVE List, as of . About the data.

About this vulnerability

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…

Summary: CVE record, as of .

  • CISA has not added CVE-2026-107161 to its Known Exploited Vulnerabilities (KEV) catalog, as of 29 Oct 2026.
  • The CVE record was published on 7 Oct 2026.
  • The CVE record carries a CVSS v3.1 base score of 7.5 (High), given by its CNA.
  • FIRST's EPSS model puts the probability of exploitation in the next 30 days at 0.3% (percentile 27.1), as of 29 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
  • CISA's SSVC assessment in the CVE record: exploitation none, automatable no, technical impact total.
  • The credits in the CVE record name AISLE as finder.

Source: CISA KEV 2026.10.29, as of ; CVE List, as of ; FIRST EPSS, as of . About the data.

Description

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.

Source: CVE List, as of . About the data.

Weakness

CWE-122

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

DateEvent
CVE record published
CVE record last updated

References

2

Known exploited Red Hat vulnerabilities

  • CVE-2015-3246: Red Hat Libuser Race Condition Vulnerability (added )
  • CVE-2015-5287: Red Hat Automatic Bug Reporting Tool Privilege Escalation Vulnerability (added )
  • CVE-2018-14667: Red Hat JBoss RichFaces Framework Expression Language Injection Vulnerability (added )
  • CVE-2021-3560: Red Hat Polkit Incorrect Authorization Vulnerability (added )
  • CVE-2021-4034: Red Hat Polkit Out-of-Bounds Read and Write Vulnerability (added )