USN-8706-1

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Source
https://ubuntu.com/security/notices/USN-8706-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8706-1.json
JSON Data
https://api.test.osv.dev/v1/vulns/USN-8706-1
Upstream
Related
Published
2026-08-31T17:30:43Z
Modified
2026-09-09T19:57:43Z
Summary
zlib vulnerability
Details

It was discovered that zlib incorrectly handled negative length parameters in CRC32 combine functions. An attacker could use this issue to cause a denial of service via excessive CPU consumption.

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"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-27171",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "low",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:24.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8706-1.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"
        }
    ]
}

Database specific

cves_map 
{
    "cves":  [
        {
            "id":  "CVE-2026-27171",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "low",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:26.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8706-1.json"