UBUNTU-CVE-2026-27171

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Source
https://ubuntu.com/security/CVE-2026-27171
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27171.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-27171
Upstream
Downstream
Related
Published
2026-02-18T04:16:00Z
Modified
2026-09-01T15:47:52Z
Severity
  • 2.9 (Low) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

zlib before 1.3.2 allows CPU consumption via crc32_combine64 and crc32_combine_gen64 because x2nmodp can do right shifts within a loop that has no termination condition.

References

Affected packages

Ubuntu:24.04:LTS / zlib

Package

Name
zlib
Purl
pkg:deb/ubuntu/zlib?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1:1.3.dfsg-3.1ubuntu2.2

Affected versions

1:1.*
1:1.2.13.dfsg-1ubuntu5
1:1.3.dfsg-3ubuntu1
1:1.3.dfsg-3.1ubuntu1
1:1.3.dfsg-3.1ubuntu2
1:1.3.dfsg-3.1ubuntu2.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "lib32z1",
            "binary_version": "1:1.3.dfsg-3.1ubuntu2.2"
        },
        {
            "binary_name": "lib64z1",
            "binary_version": "1:1.3.dfsg-3.1ubuntu2.2"
        },
        {
            "binary_name": "libminizip1t64",
            "binary_version": "1:1.3.dfsg-3.1ubuntu2.2"
        },
        {
            "binary_name": "libx32z1",
            "binary_version": "1:1.3.dfsg-3.1ubuntu2.2"
        },
        {
            "binary_name": "minizip",
            "binary_version": "1:1.3.dfsg-3.1ubuntu2.2"
        },
        {
            "binary_name": "zlib1g",
            "binary_version": "1:1.3.dfsg-3.1ubuntu2.2"
        }
    ],
    "priority_reason": "Resource consumption via API misuse only"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27171.json"

Ubuntu:25.10 / zlib

Package

Name
zlib
Purl
pkg:deb/ubuntu/zlib?arch=source&distro=questing

Affected ranges

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

Affected versions

1:1.*
1:1.3.dfsg+really1.3.1-1ubuntu1
1:1.3.dfsg+really1.3.1-1ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "lib32z1",
            "binary_version": "1:1.3.dfsg+really1.3.1-1ubuntu2"
        },
        {
            "binary_name": "lib64z1",
            "binary_version": "1:1.3.dfsg+really1.3.1-1ubuntu2"
        },
        {
            "binary_name": "libminizip1t64",
            "binary_version": "1:1.3.dfsg+really1.3.1-1ubuntu2"
        },
        {
            "binary_name": "libx32z1",
            "binary_version": "1:1.3.dfsg+really1.3.1-1ubuntu2"
        },
        {
            "binary_name": "minizip",
            "binary_version": "1:1.3.dfsg+really1.3.1-1ubuntu2"
        },
        {
            "binary_name": "zlib1g",
            "binary_version": "1:1.3.dfsg+really1.3.1-1ubuntu2"
        }
    ],
    "priority_reason": "Resource consumption via API misuse only"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27171.json"

Ubuntu:26.04:LTS / zlib

Package

Name
zlib
Purl
pkg:deb/ubuntu/zlib?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1:1.3.dfsg+really1.3.1-1ubuntu3.1

Affected versions

1:1.*
1:1.3.dfsg+really1.3.1-1ubuntu2
1:1.3.dfsg+really1.3.1-1ubuntu3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "lib32z1",
            "binary_version": "1:1.3.dfsg+really1.3.1-1ubuntu3.1"
        },
        {
            "binary_name": "lib64z1",
            "binary_version": "1:1.3.dfsg+really1.3.1-1ubuntu3.1"
        },
        {
            "binary_name": "libminizip1t64",
            "binary_version": "1:1.3.dfsg+really1.3.1-1ubuntu3.1"
        },
        {
            "binary_name": "libx32z1",
            "binary_version": "1:1.3.dfsg+really1.3.1-1ubuntu3.1"
        },
        {
            "binary_name": "minizip",
            "binary_version": "1:1.3.dfsg+really1.3.1-1ubuntu3.1"
        },
        {
            "binary_name": "zlib1g",
            "binary_version": "1:1.3.dfsg+really1.3.1-1ubuntu3.1"
        }
    ],
    "priority_reason": "Resource consumption via API misuse only"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27171.json"