UBUNTU-CVE-2026-4867

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Source

https://ubuntu.com/security/CVE-2026-4867

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4867.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-4867

Upstream

CVE-2026-4867

Withdrawn

2026-05-21T12:08:04Z

Published

2026-03-26T17:16:00Z

Modified

2026-05-21T12:15:26.723751707Z

Severity

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

Summary

[none]

Details

Impact: A bad regular expression is generated any time you have three or more parameters within a single segment, separated by something that is not a period (.). For example, /:a-:b-:c or /:a-:b-:c-:d. The backtrack protection added in path-to-regexp@0.1.12 only prevents ambiguity for two parameters. With three or more, the generated lookahead does not block single separator characters, so capture groups overlap and cause catastrophic backtracking. Patches: Upgrade to path-to-regexp@0.1.13 Custom regex patterns in route definitions (e.g., /:a-:b([^-/]+)-:c([^-/]+)) are not affected because they override the default capture group. Workarounds: All versions can be patched by providing a custom regular expression for parameters after the first in a single segment. As long as the custom regular expression does not match the text before the parameter, you will be safe. For example, change /:a-:b-:c to /:a-:b([^-/]+)-:c([^-/]+). If paths cannot be rewritten and versions cannot be upgraded, another alternative is to limit the URL length.

References

Affected packages

Ubuntu:16.04:LTS / node-path-to-regexp

Package

Name: node-path-to-regexp
Purl: pkg:deb/ubuntu/node-path-to-regexp?arch=source&distro=xenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.0.1-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "node-path-to-regexp",
            "binary_version": "1.0.1-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4867.json"

Ubuntu:18.04:LTS / node-path-to-regexp

Package

Name: node-path-to-regexp
Purl: pkg:deb/ubuntu/node-path-to-regexp?arch=source&distro=bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.0.1-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "node-path-to-regexp",
            "binary_version": "1.0.1-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4867.json"

Ubuntu:20.04:LTS / node-path-to-regexp

Package

Name: node-path-to-regexp
Purl: pkg:deb/ubuntu/node-path-to-regexp?arch=source&distro=focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.0.0-2

3.1.0-1

6.*

6.1.0-2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "node-path-to-regexp",
            "binary_version": "6.1.0-2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4867.json"