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No exploitation reportedFix available

CVE-2021-23518

No exploitation reported by the sources we read.

  • Published2022-01-21
  • Fixed in1.1.0
  • WeaknessCWE-1321

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC
  1. 2022-01-2120:15CVE publishedNVD

Versions per branch

NVD · OSV
Cached-path-relative project cached-path-relative
BranchAffectedFixed in
1.1< 1.1.01.1.0
Debian debian linux
BranchAffectedFixed in
10.0= 10.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • node-cached-path-relativeUbuntu:26.10all versions · no fixed version listed
  • node-cached-path-relativeUbuntu:26.04:LTSall versions · no fixed version listed
  • node-cached-path-relativeUbuntu:25.10all versions · no fixed version listed
  • node-cached-path-relativeUbuntu:24.04:LTSall versions · no fixed version listed
  • node-cached-path-relativeUbuntu:22.04:LTSall versions · no fixed version listed
  • node-cached-path-relativeUbuntu:20.04:LTSall versions · no fixed version listed
  • node-cached-path-relativeUbuntu:18.04:LTSall versions · no fixed version listed
  • node-cached-path-relativeDebian:14all versions · fixed in 1.1.0+~1.0.0-1

3 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-23518 Red Hat Product Security1 known affected

    cached-path-relative: Prototype Pollution via the cache variable

    rhacm2/grc-ui-rhel8 as a component of Red Hat Advanced Cluster Management for Kubernetes 2

  • RHSA-2022:1476 Red Hat Product Security221 products fixed

    Red Hat Security Advisory: Red Hat Advanced Cluster Management 2.4.3 security updates and bug fixes

Full record on NVD

Fix

  1. Update Cached-path-relative project cached-path-relative to 1.1.0
  2. Vendor fix Red Hat Product Security RHSA-2022:1476 · 221 productsFor Red Hat Advanced Cluster Management for Kubernetes, see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://access.redhat.com/documentation/en-us/red_hat_…
  3. No fix available, says the vendor Red Hat Product Security CVE-2021-23518 · 1 productAffected

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.17.3known since 2026-10-23
  • NVDCVSS 3.19.8read 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • NVDweakness (CWE)CWE-1321read 2026-10-23
  • FIRST EPSSEPSS score1.9 %2026-11-09
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2022-01-24

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2022-01-21
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-wg6g-ppvx-927h

Frequently asked questions

What is CVE-2021-23518?

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

Is CVE-2021-23518 actively exploited?

Active exploitation of CVE-2021-23518 has not been confirmed. Its EPSS score was 1.9% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-23518?

CVE-2021-23518 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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