Moderate severityNVD Advisory· Published Nov 3, 2021· Updated Sep 16, 2024
Prototype Pollution
CVE-2021-23820
Description
Type confusion in json-pointer when pointer components are arrays leads to bypass of the CVE-2020-7709 fix, enabling prototype pollution.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Type confusion in json-pointer when pointer components are arrays leads to bypass of the CVE-2020-7709 fix, enabling prototype pollution.
Vulnerability
All versions of the json-pointer package are affected by a type confusion vulnerability [1][3]. When the pointer components are arrays, the library fails to properly validate the input, leading to a bypass of the fix for CVE-2020-7709. The vulnerability resides in the core logic that processes JSON pointers, particularly in functions like .set(), .get(), and .remove(), which accept array-based pointer tokens [4].
Exploitation
An attacker can exploit this vulnerability by crafting a specially crafted JSON pointer that uses arrays as pointer components. No authentication or special network position is required if the application passes user-controlled input to json-pointer methods without sanitization. The attacker supplies a malicious pointer (e.g., ['__proto__', 'polluted']) to the vulnerable functions, which are not properly checked for allowed types [2].
Impact
Successful exploitation allows an attacker to perform prototype pollution [3]. By injecting properties into Object.prototype, the attacker can alter the behavior of all JavaScript objects in the application context. This can lead to remote code execution, denial of service, or property injection, depending on how the polluted properties are used by the application.
Mitigation
A fix was implemented in pull request #36 and merged into the repository to properly validate that pointer components are strings, not arrays [2]. Users should update to the patched version (not explicitly specified in references, but presumably 0.1.6 or later) [4]. As of the publication date (2021-11-03), no official CVE list inclusion or KEV listing has been reported. If upgrading is not immediately possible, applications should sanitize all user-supplied pointer inputs to ensure they are valid strings.
References
AI Insight generated on May 21, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
json-pointernpm | < 0.6.2 | 0.6.2 |
Affected products
22- json-pointer/json-pointerdescription
- osv-coords21 versionspkg:apk/chainguard/py3.10-jsonpointerpkg:apk/chainguard/py3.10-jsonpointer-binpkg:apk/chainguard/py3.11-jsonpointerpkg:apk/chainguard/py3.11-jsonpointer-binpkg:apk/chainguard/py3.12-jsonpointerpkg:apk/chainguard/py3.12-jsonpointer-binpkg:apk/chainguard/py3.13-jsonpointerpkg:apk/chainguard/py3.13-jsonpointer-binpkg:apk/chainguard/py3-jsonpointerpkg:apk/chainguard/py3-supported-jsonpointerpkg:apk/wolfi/py3.10-jsonpointerpkg:apk/wolfi/py3.10-jsonpointer-binpkg:apk/wolfi/py3.11-jsonpointerpkg:apk/wolfi/py3.11-jsonpointer-binpkg:apk/wolfi/py3.12-jsonpointerpkg:apk/wolfi/py3.12-jsonpointer-binpkg:apk/wolfi/py3.13-jsonpointerpkg:apk/wolfi/py3.13-jsonpointer-binpkg:apk/wolfi/py3-jsonpointerpkg:apk/wolfi/py3-supported-jsonpointerpkg:npm/json-pointer
< 0+ 20 more
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0.6.2
Patches
1931b0f9c7178Release 0.6.2
2 files changed · +2167 −1
package.json+1 −1 modified@@ -1,7 +1,7 @@ { "name": "json-pointer", "description": "Some utilities for JSON pointers described by RFC 6901", - "version": "0.6.1", + "version": "0.6.2", "author": "Manuel Stofer <manuel@smallpdf.com>", "license": "MIT", "dependencies": {
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Vulnerability mechanics
Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
7- github.com/advisories/GHSA-v5vg-g7rq-363wghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2021-23820ghsaADVISORY
- github.com/manuelstofer/json-pointer/blob/master/index.js%23L78ghsax_refsource_MISCWEB
- github.com/manuelstofer/json-pointer/commit/931b0f9c7178ca09778087b4b0ac7e4f505620c2ghsaWEB
- github.com/manuelstofer/json-pointer/pull/36ghsaWEB
- snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1910686mitrex_refsource_MISC
- snyk.io/vuln/SNYK-JS-JSONPOINTER-1577287ghsax_refsource_MISCWEB
News mentions
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