UBUNTU-CVE-2026-8458

libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate-authenticated ones, even when they are set to use different 'services'. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different services.

References

Affected packages

Ubuntu:22.04:LTS

curl

Package

Name: curl
Purl: pkg:deb/ubuntu/curl?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

7.81.0-1ubuntu1.25

Affected versions

7.*

7.74.0-1.3ubuntu2

7.74.0-1.3ubuntu3

7.80.0-3

7.81.0-1

7.81.0-1ubuntu1.1

7.81.0-1ubuntu1.2

7.81.0-1ubuntu1.3

7.81.0-1ubuntu1.4

7.81.0-1ubuntu1.6

7.81.0-1ubuntu1.7

7.81.0-1ubuntu1.8

7.81.0-1ubuntu1.10

7.81.0-1ubuntu1.11

7.81.0-1ubuntu1.13

7.81.0-1ubuntu1.14

7.81.0-1ubuntu1.15

7.81.0-1ubuntu1.16

7.81.0-1ubuntu1.17

7.81.0-1ubuntu1.18

7.81.0-1ubuntu1.19

7.81.0-1ubuntu1.20

7.81.0-1ubuntu1.21

7.81.0-1ubuntu1.22

7.81.0-1ubuntu1.23

7.81.0-1ubuntu1.24

Ecosystem specific

{
    "priority_reason": "Upstream defined this as low severity",
    "binaries": [
        {
            "binary_version": "7.81.0-1ubuntu1.25",
            "binary_name": "curl"
        },
        {
            "binary_version": "7.81.0-1ubuntu1.25",
            "binary_name": "libcurl3-gnutls"
        },
        {
            "binary_version": "7.81.0-1ubuntu1.25",
            "binary_name": "libcurl3-nss"
        },
        {
            "binary_version": "7.81.0-1ubuntu1.25",
            "binary_name": "libcurl4"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8458.json"

Ubuntu:24.04:LTS

curl

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

8.5.0-2ubuntu10.10

Affected versions

8.*

8.2.1-1ubuntu3

8.2.1-1ubuntu3.1

8.4.0-2ubuntu1

8.5.0-2ubuntu1

8.5.0-2ubuntu2

8.5.0-2ubuntu8

8.5.0-2ubuntu9

8.5.0-2ubuntu10

8.5.0-2ubuntu10.1

8.5.0-2ubuntu10.2

8.5.0-2ubuntu10.3

8.5.0-2ubuntu10.4

8.5.0-2ubuntu10.5

8.5.0-2ubuntu10.6

8.5.0-2ubuntu10.7

8.5.0-2ubuntu10.8

8.5.0-2ubuntu10.9

Ecosystem specific

{
    "priority_reason": "Upstream defined this as low severity",
    "binaries": [
        {
            "binary_version": "8.5.0-2ubuntu10.10",
            "binary_name": "curl"
        },
        {
            "binary_version": "8.5.0-2ubuntu10.10",
            "binary_name": "libcurl3t64-gnutls"
        },
        {
            "binary_version": "8.5.0-2ubuntu10.10",
            "binary_name": "libcurl4t64"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8458.json"

Ubuntu:25.10

curl

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

8.14.1-2ubuntu1.4

Affected versions

8.*

8.12.1-3ubuntu1

8.13.0-5ubuntu1

8.14.1-1ubuntu2

8.14.1-1ubuntu3

8.14.1-2ubuntu1

8.14.1-2ubuntu1.1

8.14.1-2ubuntu1.2

8.14.1-2ubuntu1.3

Ecosystem specific

{
    "priority_reason": "Upstream defined this as low severity",
    "binaries": [
        {
            "binary_version": "8.14.1-2ubuntu1.4",
            "binary_name": "curl"
        },
        {
            "binary_version": "8.14.1-2ubuntu1.4",
            "binary_name": "libcurl3t64-gnutls"
        },
        {
            "binary_version": "8.14.1-2ubuntu1.4",
            "binary_name": "libcurl4t64"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8458.json"

Ubuntu:26.04:LTS

curl

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

8.18.0-1ubuntu2.2

Affected versions

8.*

8.14.1-2ubuntu1

8.17.0-1ubuntu1

8.18.0-1ubuntu1

8.18.0-1ubuntu2

8.18.0-1ubuntu2.1

Ecosystem specific

{
    "priority_reason": "Upstream defined this as low severity",
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "8.18.0-1ubuntu2.2",
            "binary_name": "curl"
        },
        {
            "binary_version": "8.18.0-1ubuntu2.2",
            "binary_name": "libcurl3t64-gnutls"
        },
        {
            "binary_version": "8.18.0-1ubuntu2.2",
            "binary_name": "libcurl4t64"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8458.json"

Ubuntu:Pro:18.04:LTS

curl

Package

Name: curl
Purl: pkg:deb/ubuntu/curl?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

7.58.0-2ubuntu3.24+esm9

Affected versions

7.*

7.55.1-1ubuntu2

7.55.1-1ubuntu2.1

7.57.0-1ubuntu1

7.58.0-2ubuntu1

7.58.0-2ubuntu2

7.58.0-2ubuntu3

7.58.0-2ubuntu3.1

7.58.0-2ubuntu3.2

7.58.0-2ubuntu3.3

7.58.0-2ubuntu3.5

7.58.0-2ubuntu3.6

7.58.0-2ubuntu3.7

7.58.0-2ubuntu3.8

7.58.0-2ubuntu3.9

7.58.0-2ubuntu3.10

7.58.0-2ubuntu3.12

7.58.0-2ubuntu3.13

7.58.0-2ubuntu3.14

7.58.0-2ubuntu3.15

7.58.0-2ubuntu3.16

7.58.0-2ubuntu3.17

7.58.0-2ubuntu3.18

7.58.0-2ubuntu3.19

7.58.0-2ubuntu3.20

7.58.0-2ubuntu3.21

7.58.0-2ubuntu3.22

7.58.0-2ubuntu3.23

7.58.0-2ubuntu3.24

7.58.0-2ubuntu3.24+esm1

7.58.0-2ubuntu3.24+esm2

7.58.0-2ubuntu3.24+esm3

7.58.0-2ubuntu3.24+esm4

7.58.0-2ubuntu3.24+esm5

7.58.0-2ubuntu3.24+esm7

7.58.0-2ubuntu3.24+esm8

Ecosystem specific

{
    "priority_reason": "Upstream defined this as low severity",
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "7.58.0-2ubuntu3.24+esm9",
            "binary_name": "curl"
        },
        {
            "binary_version": "7.58.0-2ubuntu3.24+esm9",
            "binary_name": "libcurl3-gnutls"
        },
        {
            "binary_version": "7.58.0-2ubuntu3.24+esm9",
            "binary_name": "libcurl3-nss"
        },
        {
            "binary_version": "7.58.0-2ubuntu3.24+esm9",
            "binary_name": "libcurl4"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8458.json"

Ubuntu:Pro:20.04:LTS

curl

Package

Name: curl
Purl: pkg:deb/ubuntu/curl?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

7.68.0-1ubuntu2.25+esm4

Affected versions

7.*

7.65.3-1ubuntu3

7.65.3-1ubuntu4

7.66.0-1ubuntu1

7.67.0-2ubuntu1

7.68.0-1ubuntu1

7.68.0-1ubuntu2

7.68.0-1ubuntu2.1

7.68.0-1ubuntu2.2

7.68.0-1ubuntu2.4

7.68.0-1ubuntu2.5

7.68.0-1ubuntu2.6

7.68.0-1ubuntu2.7

7.68.0-1ubuntu2.10

7.68.0-1ubuntu2.11

7.68.0-1ubuntu2.12

7.68.0-1ubuntu2.13

7.68.0-1ubuntu2.14

7.68.0-1ubuntu2.15

7.68.0-1ubuntu2.16

7.68.0-1ubuntu2.18

7.68.0-1ubuntu2.19

7.68.0-1ubuntu2.20

7.68.0-1ubuntu2.21

7.68.0-1ubuntu2.22

7.68.0-1ubuntu2.23

7.68.0-1ubuntu2.24

7.68.0-1ubuntu2.25

7.68.0-1ubuntu2.25+esm2

7.68.0-1ubuntu2.25+esm3

Ecosystem specific

{
    "priority_reason": "Upstream defined this as low severity",
    "binaries": [
        {
            "binary_version": "7.68.0-1ubuntu2.25+esm4",
            "binary_name": "curl"
        },
        {
            "binary_version": "7.68.0-1ubuntu2.25+esm4",
            "binary_name": "libcurl3-gnutls"
        },
        {
            "binary_version": "7.68.0-1ubuntu2.25+esm4",
            "binary_name": "libcurl3-nss"
        },
        {
            "binary_version": "7.68.0-1ubuntu2.25+esm4",
            "binary_name": "libcurl4"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8458.json"