UBUNTU-CVE-2026-107161

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Source
https://ubuntu.com/security/CVE-2026-107161
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107161.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-107161
Upstream
  • CVE-2026-107161
Published
2026-10-08T00:00:00Z
Modified
2026-10-08T19:47:01Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:18.04:LTS
cyrus-sasl2

Package

Name
cyrus-sasl2
Purl
pkg:deb/ubuntu/cyrus-sasl2?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.1.27~101-g0780600+dfsg-3ubuntu1
2.1.27~101-g0780600+dfsg-3ubuntu2
2.1.27~101-g0780600+dfsg-3ubuntu2.1
2.1.27~101-g0780600+dfsg-3ubuntu2.3
2.1.27~101-g0780600+dfsg-3ubuntu2.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libsasl2-2",
            "binary_version": "2.1.27~101-g0780600+dfsg-3ubuntu2.4"
        },
        {
            "binary_name": "libsasl2-modules",
            "binary_version": "2.1.27~101-g0780600+dfsg-3ubuntu2.4"
        },
        {
            "binary_name": "libsasl2-modules-db",
            "binary_version": "2.1.27~101-g0780600+dfsg-3ubuntu2.4"
        },
        {
            "binary_name": "libsasl2-modules-gssapi-heimdal",
            "binary_version": "2.1.27~101-g0780600+dfsg-3ubuntu2.4"
        },
        {
            "binary_name": "libsasl2-modules-gssapi-mit",
            "binary_version": "2.1.27~101-g0780600+dfsg-3ubuntu2.4"
        },
        {
            "binary_name": "libsasl2-modules-ldap",
            "binary_version": "2.1.27~101-g0780600+dfsg-3ubuntu2.4"
        },
        {
            "binary_name": "libsasl2-modules-otp",
            "binary_version": "2.1.27~101-g0780600+dfsg-3ubuntu2.4"
        },
        {
            "binary_name": "libsasl2-modules-sql",
            "binary_version": "2.1.27~101-g0780600+dfsg-3ubuntu2.4"
        },
        {
            "binary_name": "sasl2-bin",
            "binary_version": "2.1.27~101-g0780600+dfsg-3ubuntu2.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107161.json"
Ubuntu:20.04:LTS
cyrus-sasl2

Package

Name
cyrus-sasl2
Purl
pkg:deb/ubuntu/cyrus-sasl2?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.1.27+dfsg-1build3
2.1.27+dfsg-2
2.1.27+dfsg-2ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libsasl2-2",
            "binary_version": "2.1.27+dfsg-2ubuntu0.1"
        },
        {
            "binary_name": "libsasl2-modules",
            "binary_version": "2.1.27+dfsg-2ubuntu0.1"
        },
        {
            "binary_name": "libsasl2-modules-db",
            "binary_version": "2.1.27+dfsg-2ubuntu0.1"
        },
        {
            "binary_name": "libsasl2-modules-gssapi-heimdal",
            "binary_version": "2.1.27+dfsg-2ubuntu0.1"
        },
        {
            "binary_name": "libsasl2-modules-gssapi-mit",
            "binary_version": "2.1.27+dfsg-2ubuntu0.1"
        },
        {
            "binary_name": "libsasl2-modules-ldap",
            "binary_version": "2.1.27+dfsg-2ubuntu0.1"
        },
        {
            "binary_name": "libsasl2-modules-otp",
            "binary_version": "2.1.27+dfsg-2ubuntu0.1"
        },
        {
            "binary_name": "libsasl2-modules-sql",
            "binary_version": "2.1.27+dfsg-2ubuntu0.1"
        },
        {
            "binary_name": "sasl2-bin",
            "binary_version": "2.1.27+dfsg-2ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107161.json"
Ubuntu:22.04:LTS
cyrus-sasl2

Package

Name
cyrus-sasl2
Purl
pkg:deb/ubuntu/cyrus-sasl2?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.1.27+dfsg-2.1build1
2.1.27+dfsg-2.2
2.1.27+dfsg-2.3
2.1.27+dfsg2-1
2.1.27+dfsg2-2
2.1.27+dfsg2-2build1
2.1.27+dfsg2-2ubuntu1
2.1.27+dfsg2-3
2.1.27+dfsg2-3ubuntu1
2.1.27+dfsg2-3ubuntu1.1
2.1.27+dfsg2-3ubuntu1.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libsasl2-2",
            "binary_version": "2.1.27+dfsg2-3ubuntu1.2"
        },
        {
            "binary_name": "libsasl2-modules",
            "binary_version": "2.1.27+dfsg2-3ubuntu1.2"
        },
        {
            "binary_name": "libsasl2-modules-db",
            "binary_version": "2.1.27+dfsg2-3ubuntu1.2"
        },
        {
            "binary_name": "libsasl2-modules-gssapi-heimdal",
            "binary_version": "2.1.27+dfsg2-3ubuntu1.2"
        },
        {
            "binary_name": "libsasl2-modules-gssapi-mit",
            "binary_version": "2.1.27+dfsg2-3ubuntu1.2"
        },
        {
            "binary_name": "libsasl2-modules-ldap",
            "binary_version": "2.1.27+dfsg2-3ubuntu1.2"
        },
        {
            "binary_name": "libsasl2-modules-otp",
            "binary_version": "2.1.27+dfsg2-3ubuntu1.2"
        },
        {
            "binary_name": "libsasl2-modules-sql",
            "binary_version": "2.1.27+dfsg2-3ubuntu1.2"
        },
        {
            "binary_name": "sasl2-bin",
            "binary_version": "2.1.27+dfsg2-3ubuntu1.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107161.json"
Ubuntu:24.04:LTS
cyrus-sasl2

Package

Name
cyrus-sasl2
Purl
pkg:deb/ubuntu/cyrus-sasl2?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.1.28+dfsg1-3
2.1.28+dfsg1-4
2.1.28+dfsg1-5ubuntu1
2.1.28+dfsg1-5ubuntu2
2.1.28+dfsg1-5ubuntu3
2.1.28+dfsg1-5ubuntu3.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libsasl2-2",
            "binary_version": "2.1.28+dfsg1-5ubuntu3.1"
        },
        {
            "binary_name": "libsasl2-modules",
            "binary_version": "2.1.28+dfsg1-5ubuntu3.1"
        },
        {
            "binary_name": "libsasl2-modules-db",
            "binary_version": "2.1.28+dfsg1-5ubuntu3.1"
        },
        {
            "binary_name": "libsasl2-modules-gssapi-heimdal",
            "binary_version": "2.1.28+dfsg1-5ubuntu3.1"
        },
        {
            "binary_name": "libsasl2-modules-gssapi-mit",
            "binary_version": "2.1.28+dfsg1-5ubuntu3.1"
        },
        {
            "binary_name": "libsasl2-modules-ldap",
            "binary_version": "2.1.28+dfsg1-5ubuntu3.1"
        },
        {
            "binary_name": "libsasl2-modules-otp",
            "binary_version": "2.1.28+dfsg1-5ubuntu3.1"
        },
        {
            "binary_name": "libsasl2-modules-sql",
            "binary_version": "2.1.28+dfsg1-5ubuntu3.1"
        },
        {
            "binary_name": "sasl2-bin",
            "binary_version": "2.1.28+dfsg1-5ubuntu3.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107161.json"
Ubuntu:26.04:LTS
cyrus-sasl2

Package

Name
cyrus-sasl2
Purl
pkg:deb/ubuntu/cyrus-sasl2?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.1.28+dfsg1-9ubuntu1
2.1.28+dfsg1-9ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libsasl2-2",
            "binary_version": "2.1.28+dfsg1-9ubuntu3"
        },
        {
            "binary_name": "libsasl2-modules",
            "binary_version": "2.1.28+dfsg1-9ubuntu3"
        },
        {
            "binary_name": "libsasl2-modules-db",
            "binary_version": "2.1.28+dfsg1-9ubuntu3"
        },
        {
            "binary_name": "libsasl2-modules-gssapi-heimdal",
            "binary_version": "2.1.28+dfsg1-9ubuntu3"
        },
        {
            "binary_name": "libsasl2-modules-gssapi-mit",
            "binary_version": "2.1.28+dfsg1-9ubuntu3"
        },
        {
            "binary_name": "libsasl2-modules-ldap",
            "binary_version": "2.1.28+dfsg1-9ubuntu3"
        },
        {
            "binary_name": "libsasl2-modules-otp",
            "binary_version": "2.1.28+dfsg1-9ubuntu3"
        },
        {
            "binary_name": "libsasl2-modules-sql",
            "binary_version": "2.1.28+dfsg1-9ubuntu3"
        },
        {
            "binary_name": "sasl2-bin",
            "binary_version": "2.1.28+dfsg1-9ubuntu3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107161.json"
Ubuntu:Pro:14.04:LTS
cyrus-sasl2

Package

Name
cyrus-sasl2
Purl
pkg:deb/ubuntu/cyrus-sasl2?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.1.25.dfsg1-17
2.1.25.dfsg1-17build1
2.1.25.dfsg1-17ubuntu0.1~esm1
2.1.25.dfsg1-17ubuntu0.1~esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libsasl2-2",
            "binary_version": "2.1.25.dfsg1-17ubuntu0.1~esm2"
        },
        {
            "binary_name": "libsasl2-modules",
            "binary_version": "2.1.25.dfsg1-17ubuntu0.1~esm2"
        },
        {
            "binary_name": "libsasl2-modules-db",
            "binary_version": "2.1.25.dfsg1-17ubuntu0.1~esm2"
        },
        {
            "binary_name": "libsasl2-modules-gssapi-heimdal",
            "binary_version": "2.1.25.dfsg1-17ubuntu0.1~esm2"
        },
        {
            "binary_name": "libsasl2-modules-gssapi-mit",
            "binary_version": "2.1.25.dfsg1-17ubuntu0.1~esm2"
        },
        {
            "binary_name": "libsasl2-modules-ldap",
            "binary_version": "2.1.25.dfsg1-17ubuntu0.1~esm2"
        },
        {
            "binary_name": "libsasl2-modules-otp",
            "binary_version": "2.1.25.dfsg1-17ubuntu0.1~esm2"
        },
        {
            "binary_name": "libsasl2-modules-sql",
            "binary_version": "2.1.25.dfsg1-17ubuntu0.1~esm2"
        },
        {
            "binary_name": "sasl2-bin",
            "binary_version": "2.1.25.dfsg1-17ubuntu0.1~esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107161.json"
Ubuntu:Pro:16.04:LTS
cyrus-sasl2

Package

Name
cyrus-sasl2
Purl
pkg:deb/ubuntu/cyrus-sasl2?arch=source&distro=esm-infra%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.1.26.dfsg1-14
2.1.26.dfsg1-14build1
2.1.26.dfsg1-14ubuntu0.1
2.1.26.dfsg1-14ubuntu0.2
2.1.26.dfsg1-14ubuntu0.2+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libsasl2-2",
            "binary_version": "2.1.26.dfsg1-14ubuntu0.2+esm1"
        },
        {
            "binary_name": "libsasl2-modules",
            "binary_version": "2.1.26.dfsg1-14ubuntu0.2+esm1"
        },
        {
            "binary_name": "libsasl2-modules-db",
            "binary_version": "2.1.26.dfsg1-14ubuntu0.2+esm1"
        },
        {
            "binary_name": "libsasl2-modules-gssapi-heimdal",
            "binary_version": "2.1.26.dfsg1-14ubuntu0.2+esm1"
        },
        {
            "binary_name": "libsasl2-modules-gssapi-mit",
            "binary_version": "2.1.26.dfsg1-14ubuntu0.2+esm1"
        },
        {
            "binary_name": "libsasl2-modules-ldap",
            "binary_version": "2.1.26.dfsg1-14ubuntu0.2+esm1"
        },
        {
            "binary_name": "libsasl2-modules-otp",
            "binary_version": "2.1.26.dfsg1-14ubuntu0.2+esm1"
        },
        {
            "binary_name": "libsasl2-modules-sql",
            "binary_version": "2.1.26.dfsg1-14ubuntu0.2+esm1"
        },
        {
            "binary_name": "sasl2-bin",
            "binary_version": "2.1.26.dfsg1-14ubuntu0.2+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-107161.json"