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🛡️ CVE-2021-23518 — cached-path-relative

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-1321 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability low.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: Low — limited, and the attacker does not choose what is affected.
  • Availability impact: Low — limited, and the attacker does not choose what is affected.

Weakness class

CVE-2021-23518 is classified as CWE-1321: Prototype Pollution. Attacker input can modify an object prototype, changing behaviour for objects across the application.

Affected software

CVE-2021-23518 is recorded against 1 package.

  • cached-path-relative

Timeline and source

Published on 27 January 2022 and last revised on 14 January 2025. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)
lists.debian.org (Web)
snyk.io (Web)
snyk.io (Web)

Same weakness in other software

These advisories are the same class of weakness (CWE-1321: Prototype Pollution) in other software:

CVE-2021-23518 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CWE CWE-1321
Public Exploit ✅ No
Source OSV
Published 2022-01-27
Updated 2026-08-20
Modified 2025-01-14
Fix URL N/A

Affected Packages

Software From version Fixed in
cached-path-relative — —

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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