UBUNTU-CVE-2026-86409

See a problem?
Please try reporting it to the source first.

Source

https://ubuntu.com/security/CVE-2026-86409

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86409.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-86409

Upstream

CVE-2026-86409

Downstream

USN (3)

Related

USN (3)

Published

2026-10-14T06:00:00Z

Modified

2026-10-31T03:30:14Z

Severity

8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Ubuntu - low

Summary

[none]

Details

Setting CURLOPT_AWS_SIGV4 to NULL but does not disable SigV4 authentication, contrary to expectations and documentation. A subsequent transfer on the same handle still sends an Authorization: AWS4-HMAC-SHA256 header to whatever URL isset next, leaking state information.

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

0 Unknown introduced version / All previous versions are affected

Fixed

7.81.0-1ubuntu1.30

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

7.81.0-1ubuntu1.25

7.81.0-1ubuntu1.26

7.81.0-1ubuntu1.27

7.81.0-1ubuntu1.29

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "7.81.0-1ubuntu1.30"
        },
        {
            "binary_name": "libcurl3-gnutls",
            "binary_version": "7.81.0-1ubuntu1.30"
        },
        {
            "binary_name": "libcurl3-nss",
            "binary_version": "7.81.0-1ubuntu1.30"
        },
        {
            "binary_name": "libcurl4",
            "binary_version": "7.81.0-1ubuntu1.30"
        }
    ],
    "priority_reason": "Upstream defined this as low severity"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86409.json"

Ubuntu:24.04:LTS / curl

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

8.5.0-2ubuntu10.16

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

8.5.0-2ubuntu10.10

8.5.0-2ubuntu10.11

8.5.0-2ubuntu10.12

8.5.0-2ubuntu10.13

8.5.0-2ubuntu10.15

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "8.5.0-2ubuntu10.16"
        },
        {
            "binary_name": "libcurl3t64-gnutls",
            "binary_version": "8.5.0-2ubuntu10.16"
        },
        {
            "binary_name": "libcurl4t64",
            "binary_version": "8.5.0-2ubuntu10.16"
        }
    ],
    "priority_reason": "Upstream defined this as low severity"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86409.json"

Ubuntu:26.10 / curl

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

8.20.0-2ubuntu11.1

Affected versions

8.*

8.18.0-1ubuntu2

8.20.0-2ubuntu1

8.20.0-2ubuntu3

8.20.0-2ubuntu10

8.20.0-2ubuntu11

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "8.20.0-2ubuntu11.1"
        },
        {
            "binary_name": "libcurl3t64-gnutls",
            "binary_version": "8.20.0-2ubuntu11.1"
        },
        {
            "binary_name": "libcurl4t64",
            "binary_version": "8.20.0-2ubuntu11.1"
        }
    ],
    "priority_reason": "Upstream defined this as low severity"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86409.json"

Ubuntu:26.04:LTS / curl

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

8.18.0-1ubuntu2.8

Affected versions

8.*

8.14.1-2ubuntu1

8.17.0-1ubuntu1

8.18.0-1ubuntu1

8.18.0-1ubuntu2

8.18.0-1ubuntu2.1

8.18.0-1ubuntu2.2

8.18.0-1ubuntu2.3

8.18.0-1ubuntu2.4

8.18.0-1ubuntu2.5

8.18.0-1ubuntu2.7

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "8.18.0-1ubuntu2.8"
        },
        {
            "binary_name": "libcurl3t64-gnutls",
            "binary_version": "8.18.0-1ubuntu2.8"
        },
        {
            "binary_name": "libcurl4t64",
            "binary_version": "8.18.0-1ubuntu2.8"
        }
    ],
    "priority_reason": "Upstream defined this as low severity"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86409.json"