CVE-2021-23423

Directory Traversal

5.5 MediumFix available

This affects the package bikeshed before 3.0.0. This can occur when an untrusted source file containing include, include-code or include-raw block is processed. The contents of arbitrary files could be disclosed in the HTML output.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: None
Availability: None

Exploit likelihood

1.11%Up 0.5 points since Aug 16, 2021

What each source reports

CVE List Score used 5.5

Directory Traversal

Record: CVE-2021-23423
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Updated: 2026-11-02

EUVDEUVD-2021-0034 5.5

Record: EUVD-2021-0034
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-hf6p-4rv2-9qrp 5.5

Path Traversal in bikshed

Record: GHSA-hf6p-4rv2-9qrp
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Weakness: CWE-22
Updated: 2026-11-02

NVD 5.5

Record: CVE-2021-23423
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:P/I:N/A:N
Weakness: CWE-22
Updated: 2026-11-02

OSV 7.5

Record: CVE-2021-23423
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated: 2026-11-02

OSVGHSA-hf6p-4rv2-9qrp 5.5

Path Traversal in bikshed

Record: GHSA-hf6p-4rv2-9qrp
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Weakness: CWE-22
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-23423 5.5

Record: UBUNTU-CVE-2021-23423
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated: 2026-11-02

OSVPYSEC-2021-117 No score

Record: PYSEC-2021-117
Updated: 2026-11-02

Affected products

bikeshed project bikeshed

Affected packages

Affected packages
Package	Affected	Fixed
`bikeshed` PyPI	before 3.0.0	3.0.0
`bikeshed` PyPI	before 3.0.0, plus listed versions 1.0.01.0.11.0.101.0.21.0.3 Show 41 moreShow less 1.0.41.0.51.0.61.0.71.0.81.0.91.1.01.2.01.2.11.2.21.3.01.4.01.4.11.4.21.4.31.4.41.5.01.5.11.5.21.5.31.6.01.6.11.6.21.6.31.7.02.0.02.1.02.2.02.2.12.2.22.2.32.3.02.3.12.4.02.4.12.4.22.4.32.4.42.4.52.4.62.4.7	3.0.0
`bikeshed` Ubuntu:16.04:LTS	All versions, plus listed versions 1.53-0ubuntu11.60-0ubuntu11.61-0ubuntu11.62-0ubuntu11.65-0ubuntu1	None known
`bikeshed` Ubuntu:18.04:LTS	All versions, plus listed versions 1.71-0ubuntu11.72-0ubuntu11.73-0ubuntu1	None known
`bikeshed` Ubuntu:20.04:LTS	All versions, plus listed versions 1.78-0ubuntu1	None known
`bikeshed` Ubuntu:22.04:LTS	All versions, plus listed versions 1.78-0ubuntu1	None known
`bikeshed` Ubuntu:24.04:LTS	All versions, plus listed versions 1.78-0ubuntu1	None known
`bikeshed` Ubuntu:25.10	All versions, plus listed versions 1.78-0ubuntu1	None known
`bikeshed` Ubuntu:26.10	All versions, plus listed versions 1.78-0ubuntu2	None known
`bikeshed` Ubuntu:26.04:LTS	All versions, plus listed versions 1.78-0ubuntu11.78-0ubuntu2	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-23423 is a medium vulnerability (CVSS 5.5) in Bikeshed Project Bikeshed, published August 16, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.11%, the 66th percentile. Fixed in bikeshed 3.0.0.