CVE Explorer
CVE-2026-33993
Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Prior to version 3.0.25, the `unserialize()` function in `locutus/php/var/unserialize` assigns deserialized keys to plain objects via bracket notation without filtering the `__proto__` key. When a PHP serialized payload contains `__proto__` as an array or object key, JavaScript's `__proto__` setter is invoked, replacing the deserialized object's prototype with attacker-controlled content. This enables p
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"locutus","vendor":"locutusjs","versions":[{"status":"affected","version":"< 3.0.25"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:ce23bf548131467dac97dd0935943db133553fd26fa5ba1797487ece32c2d364 · sha256:d5063f734a945fbb… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:ce23bf548131467dac97dd0935943db133553fd26fa5ba1797487ece32c2d364 · sha256:d5063f734a945fbb… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-1321","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:ce23bf548131467dac97dd0935943db133553fd26fa5ba1797487ece32c2d364 · sha256:d5063f734a945fbb… · /containers/cna/problemTypes/0/descriptions/0
Source references
4 source assertions{"name":"https://github.com/locutusjs/locutus/commit/345a6211e1e6f939f96a7090bfeff642c9fcf9e4","tags":["x_refsource_MISC"],"url":"https://github.com/locutusjs/locutus/commit/345a6211e1e6f939f96a7090bfeff642c9fcf9e4"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:ce23bf548131467dac97dd0935943db133553fd26fa5ba1797487ece32c2d364 · sha256:d5063f734a945fbb… · /containers/cna/references/2
{"name":"https://github.com/locutusjs/locutus/pull/597","tags":["x_refsource_MISC"],"url":"https://github.com/locutusjs/locutus/pull/597"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:ce23bf548131467dac97dd0935943db133553fd26fa5ba1797487ece32c2d364 · sha256:d5063f734a945fbb… · /containers/cna/references/1
{"name":"https://github.com/locutusjs/locutus/releases/tag/v3.0.25","tags":["x_refsource_MISC"],"url":"https://github.com/locutusjs/locutus/releases/tag/v3.0.25"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:ce23bf548131467dac97dd0935943db133553fd26fa5ba1797487ece32c2d364 · sha256:d5063f734a945fbb… · /containers/cna/references/3
{"name":"https://github.com/locutusjs/locutus/security/advisories/GHSA-4mph-v827-f877","tags":["x_refsource_CONFIRM"],"url":"https://github.com/locutusjs/locutus/security/advisories/GHSA-4mph-v827-f877"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:ce23bf548131467dac97dd0935943db133553fd26fa5ba1797487ece32c2d364 · sha256:d5063f734a945fbb… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.