UBUNTU-CVE-2026-19931

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Source

https://ubuntu.com/security/CVE-2026-19931

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19931.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-19931

Upstream

CVE-2026-19931

Published

2026-09-06T18:17:00Z

Modified

2026-09-16T11:31:18Z

Severity

9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given hostname using Negotiate authentication, when the initial request is done using empty credentials. This can make user B's request get sent over user A's previously authenticated connection.

References

Affected packages

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

0 Unknown introduced version / All previous versions are affected

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

7.68.0-1ubuntu2.25+esm4

7.68.0-1ubuntu2.25+esm5

7.68.0-1ubuntu2.25+esm6

7.68.0-1ubuntu2.25+esm7

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "curl",
            "binary_version":  "7.68.0-1ubuntu2.25+esm7"
        },
        {
            "binary_name":  "libcurl3-gnutls",
            "binary_version":  "7.68.0-1ubuntu2.25+esm7"
        },
        {
            "binary_name":  "libcurl3-nss",
            "binary_version":  "7.68.0-1ubuntu2.25+esm7"
        },
        {
            "binary_name":  "libcurl4",
            "binary_version":  "7.68.0-1ubuntu2.25+esm7"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19931.json"

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

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

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "curl",
            "binary_version":  "7.81.0-1ubuntu1.27"
        },
        {
            "binary_name":  "libcurl3-gnutls",
            "binary_version":  "7.81.0-1ubuntu1.27"
        },
        {
            "binary_name":  "libcurl3-nss",
            "binary_version":  "7.81.0-1ubuntu1.27"
        },
        {
            "binary_name":  "libcurl4",
            "binary_version":  "7.81.0-1ubuntu1.27"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19931.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

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

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "curl",
            "binary_version":  "8.5.0-2ubuntu10.13"
        },
        {
            "binary_name":  "libcurl3t64-gnutls",
            "binary_version":  "8.5.0-2ubuntu10.13"
        },
        {
            "binary_name":  "libcurl4t64",
            "binary_version":  "8.5.0-2ubuntu10.13"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19931.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

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

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "curl",
            "binary_version":  "8.18.0-1ubuntu2.5"
        },
        {
            "binary_name":  "libcurl3t64-gnutls",
            "binary_version":  "8.18.0-1ubuntu2.5"
        },
        {
            "binary_name":  "libcurl4t64",
            "binary_version":  "8.18.0-1ubuntu2.5"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19931.json"