CVE-2020-28273
Description
Prototype pollution in set-in 1.0.0–2.0.0 allows DoS or RCE by setting __proto__ or constructor.prototype in the path.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Prototype pollution in set-in 1.0.0–2.0.0 allows DoS or RCE by setting `__proto__` or `constructor.prototype` in the path.
Vulnerability
Overview The set-in npm package versions 1.0.0 through 2.0.0 contain a prototype pollution vulnerability. The function recursivelySetIn does not sanitize the path parameter, allowing keys like __proto__ or constructor.prototype to be used. This can pollute the base object prototype, leading to denial of service or remote code execution.
Exploitation
Details An attacker can supply a crafted path argument that includes __proto__ or constructor.prototype to set arbitrary properties on Object.prototype. No authentication is required; if the attacker controls the path parameter passed to setIn, they can trigger the vulnerability. The commit fix adds assertions to block these dangerous keys [1][2].
Impact
Successful exploitation can cause prototype pollution, which may result in denial of service or, in certain runtime contexts, remote code execution. The Mend (formerly WhiteSource) advisory confirms the DoS and potential RCE impact [3].
Mitigation
The vulnerability is fixed in commit e431effa00195a6f06b111e09733cd1445a91a88 [2]. Users should update to a patched version of set-in. No workarounds are documented; the safest mitigation is to upgrade.
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 |
|---|---|---|
set-innpm | < 2.0.1 | 2.0.1 |
Affected products
2- set-in/set-indescription
Patches
1e431effa0019fix prototype pollution vulnerability
3 files changed · +2765 −3
index.js+18 −0 modified@@ -16,13 +16,31 @@ function recursivelySetIn (object, path, value, index) { object = object || {} + // https://stackoverflow.com/a/60850027 + assert.ok( + path[index] !== '__proto__', + 'setIn: "__proto__" is disallowed in path due to possible prototype pollution attack.' + ) + if (index < path.length - 1) { + assert.ok( + path[index] !== 'constructor' && path[index + 1] !== 'prototype', + 'setIn: ["constructor", "prototype"] is disallowed in path due to possible prototype pollution attack.' + ) + } + var key = path[index] if (key === '-') { assert.ok(Array.isArray(object), 'setIn: "-" in path must correspond to array.') key = object.length } + if ( + key === '__proto__' || + (key === 'constructor' && path[index + 1] === 'prototype')) { + + } + var next = recursivelySetIn(object[key], path, value, ++index) return set(object, key, next)
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[truncated]
test/index.js+15 −3 modified@@ -2,9 +2,9 @@ const test = require('tape') const setIn = require('../') test('non-Array path', function (t) { - t.throws(() => setIn({ 'a': { 'b': 'c' }}, undefined)) - t.throws(() => setIn({ 'a': { 'b': 'c' }}, 'a.b')) - t.throws(() => setIn({ 'a': { 'b': 'c' }}, { 'a': 'b'})) + t.throws(() => setIn({ 'a': { 'b': 'c' }}, undefined, 'x')) + t.throws(() => setIn({ 'a': { 'b': 'c' }}, 'a.b', 'x')) + t.throws(() => setIn({ 'a': { 'b': 'c' }}, { 'a': 'b'}, 'x')) t.end() }) @@ -175,3 +175,15 @@ test('object with custom get function', function (t) { t.end() }) */ + +test('prototype pollution', function (t) { + t.throws(() => setIn({ 'a': { 'b': 'c' }}, ['__proto__'], { a: 'x' })) + t.throws(() => setIn({ 'a': { 'b': 'c' }}, ['__proto__', 'a'], 'x')) + t.throws(() => setIn({ 'a': { 'b': 'c' }}, ['a', '__proto__'], 'x')) + t.throws(() => setIn({ 'a': { 'b': 'c' }}, ['constructor', 'prototype'], { a: 'x' })) + t.throws(() => setIn({ 'a': { 'b': 'c' }}, ['constructor', 'prototype', 'a'], 'x')) + setIn({ 'a': { 'b': 'c' }}, ['prototype', 'a'], 'x') + setIn({ 'a': { 'b': 'c' }}, ['constructor'], 'x') + t.end() +}) +
Vulnerability mechanics
Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
5- github.com/advisories/GHSA-qr4p-c9wr-phr6ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2020-28273ghsaADVISORY
- github.com/ahdinosaur/set-in/commit/e431effa00195a6f06b111e09733cd1445a91a88ghsax_refsource_MISCWEB
- www.whitesourcesoftware.com/vulnerability-databasemitrex_refsource_MISC
- www.whitesourcesoftware.com/vulnerability-database/CVE-2020-28273ghsax_refsource_MISCWEB
News mentions
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