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CVE-2021-23518

Prototype Pollution

7.3 HighFix available

The package cached-path-relative before 1.1.0 are vulnerable to Prototype Pollution via the cache variable that is set as {} instead of Object.create(null) in the cachedPathRelative function, which allows access to the parent prototype properties when the object is used to create the cached relative path. When using the origin path as proto, the attribute of the object is accessed instead of a path. Note: This vulnerability derives from an incomplete fix in https://security.snyk.io/vuln/SNYK-JS-CACHEDPATHRELATIVE-72573

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
Low

Exploit likelihood

1.94%Up 1.1 points since Jan 22, 2022
90%50%10%1%

What each source reports

CVE List Score used 7.3

Prototype Pollution

The package cached-path-relative before 1.1.0 are vulnerable to Prototype Pollution via the cache variable that is set as {} instead of Object.create(null) in the cachedPathRelative function, which allows access to the parent prototype properties when the object is used to create the cached relative path. When using the origin path as proto, the attribute of the object is accessed instead of a path. Note: This vulnerability derives from an incomplete fix in https://security.snyk.io/vuln/SNYK-JS-CACHEDPATHRELATIVE-72573

Record
CVE-2021-23518
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P
Updated
2026-11-02
EUVDEUVD-2022-0723 7.3

The package cached-path-relative before 1.1.0 are vulnerable to Prototype Pollution via the cache variable that is set as {} instead of Object.create(null) in the cachedPathRelative function, which allows access to the parent prototype properties when the object is used to create the cached relative path. When using the origin path as proto, the attribute of the object is accessed instead of a path. Note: This vulnerability derives from an incomplete fix in https://security.snyk.io/vuln/SNYK-JS-CACHEDPATHRELATIVE-72573

Record
EUVD-2022-0723
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P
Updated
2026-11-03
GitHub AdvisoriesGHSA-wg6g-ppvx-927h 7.3

Prototype Pollution in cached-path-relative

The package cached-path-relative before 1.1.0 is vulnerable to Prototype Pollution via the cache variable that is set as {} instead of Object.create(null) in the cachedPathRelative function, which allows access to the parent prototype properties when the object is used to create the cached relative path. When using the origin path as proto, the attribute of the object is accessed instead of a path. Note: This vulnerability derives from an incomplete fix in https://security.snyk.io/vuln/SNYK-JS-CACHEDPATHRELATIVE-72573

Record
GHSA-wg6g-ppvx-927h
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness
CWE-1321
Updated
2026-11-02
NVD 7.3

The package cached-path-relative before 1.1.0 are vulnerable to Prototype Pollution via the cache variable that is set as {} instead of Object.create(null) in the cachedPathRelative function, which allows access to the parent prototype properties when the object is used to create the cached relative path. When using the origin path as proto, the attribute of the object is accessed instead of a path. Note: This vulnerability derives from an incomplete fix in https://security.snyk.io/vuln/SNYK-JS-CACHEDPATHRELATIVE-72573

Record
CVE-2021-23518
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness
CWE-1321
Updated
2026-11-02
OSV 9.8

The package cached-path-relative before 1.1.0 are vulnerable to Prototype Pollution via the cache variable that is set as {} instead of Object.create(null) in the cachedPathRelative function, which allows access to the parent prototype properties when the object is used to create the cached relative path. When using the origin path as proto, the attribute of the object is accessed instead of a path. Note: This vulnerability derives from an incomplete fix in https://security.snyk.io/vuln/SNYK-JS-CACHEDPATHRELATIVE-72573

Record
CVE-2021-23518
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2021-23518 9.8

The package cached-path-relative before 1.1.0 are vulnerable to Prototype Pollution via the cache variable that is set as {} instead of Object.create(null) in the cachedPathRelative function, which allows access to the parent prototype properties when the object is used to create the cached relative path. When using the origin path as proto, the attribute of the object is accessed instead of a path. Note: This vulnerability derives from an incomplete fix in https://security.snyk.io/vuln/SNYK-JS-CACHEDPATHRELATIVE-72573

Record
DEBIAN-CVE-2021-23518
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVGHSA-wg6g-ppvx-927h 7.3

Prototype Pollution in cached-path-relative

The package cached-path-relative before 1.1.0 is vulnerable to Prototype Pollution via the cache variable that is set as {} instead of Object.create(null) in the cachedPathRelative function, which allows access to the parent prototype properties when the object is used to create the cached relative path. When using the origin path as proto, the attribute of the object is accessed instead of a path. Note: This vulnerability derives from an incomplete fix in https://security.snyk.io/vuln/SNYK-JS-CACHEDPATHRELATIVE-72573

Record
GHSA-wg6g-ppvx-927h
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness
CWE-1321
Updated
2026-11-02
OSVUBUNTU-CVE-2021-23518 7.3

The package cached-path-relative before 1.1.0 are vulnerable to Prototype Pollution via the cache variable that is set as {} instead of Object.create(null) in the cachedPathRelative function, which allows access to the parent prototype properties when the object is used to create the cached relative path. When using the origin path as proto, the attribute of the object is accessed instead of a path. Note: This vulnerability derives from an incomplete fix in https://security.snyk.io/vuln/SNYK-JS-CACHEDPATHRELATIVE-72573

Record
UBUNTU-CVE-2021-23518
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
cached-path-relative
npm
 before 1.1.0
1.1.0
node-cached-path-relative
Debian:12
 before 1.1.0+~1.0.0-1
1.1.0+~1.0.0-1
node-cached-path-relative
Debian:13
 before 1.1.0+~1.0.0-1
1.1.0+~1.0.0-1
node-cached-path-relative
Debian:14
 before 1.1.0+~1.0.0-1
1.1.0+~1.0.0-1
node-cached-path-relative
Debian:10
From an advisory covering 2 CVEs
 before 1.0.1-2+deb10u1, plus listed versions
1.0.1-2
1.0.1-2+deb10u1
node-cached-path-relative
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.0.1-1
 None known
node-cached-path-relative
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.0.2-1
 None known
node-cached-path-relative
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.0.2-11.0.2-21.0.2-31.1.0+~1.0.0-1
 None known
node-cached-path-relative
Ubuntu:24.04:LTS
 All versions, plus listed versions
1.1.0+~1.0.0-3
 None known
node-cached-path-relative
Ubuntu:25.10
 All versions, plus listed versions
1.1.0+~1.0.0-3
 None known
node-cached-path-relative
Ubuntu:26.10
 All versions, plus listed versions
1.1.0+~1.0.2-1
 None known
node-cached-path-relative
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.1.0+~1.0.0-31.1.0+~1.0.2-1
 None known

History

History
RecordedChangedSources
affected, facts
aliases, products, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2021-23518 is a high vulnerability (CVSS 7.3) in Cached-path-relative Project Cached-path-relative, published January 21, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.94%, the 80th percentile. Fixed in cached-path-relative 1.1.0.

References

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