CVE Explorer
CVE-2026-59952
Valibot helps validate data using a schema. Versions prior to 1.4.2 can throw a TypeError inside its flatten() helper when validation issues contain attacker-controlled object keys such as toString, valueOf, or hasOwnProperty. The issue is reachable through normal record() validation. record() intentionally filters __proto__, prototype, and constructor, but it still accepts other own keys that collide with inherited Object.prototype properties. If the record key schema or value schema rejects su
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"valibot","vendor":"open-circle","versions":[{"status":"affected","version":"< 1.4.2"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:7fa40d2d5aa57c04cc52739dd8e6f62cc2dd6351e5f7385e2e20431f8e19609e · sha256:c91004bf2020d0d2… · /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:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:7fa40d2d5aa57c04cc52739dd8e6f62cc2dd6351e5f7385e2e20431f8e19609e · sha256:c91004bf2020d0d2… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-755","description":"CWE-755: Improper Handling of Exceptional Conditions","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:7fa40d2d5aa57c04cc52739dd8e6f62cc2dd6351e5f7385e2e20431f8e19609e · sha256:c91004bf2020d0d2… · /containers/cna/problemTypes/0/descriptions/0
Source references
5 source assertions{"name":"https://github.com/open-circle/valibot/commit/1bd01c304657cd0809cc92694360b6cc60f700bf","tags":["x_refsource_MISC"],"url":"https://github.com/open-circle/valibot/commit/1bd01c304657cd0809cc92694360b6cc60f700bf"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:7fa40d2d5aa57c04cc52739dd8e6f62cc2dd6351e5f7385e2e20431f8e19609e · sha256:c91004bf2020d0d2… · /containers/cna/references/2
{"name":"https://github.com/open-circle/valibot/pull/1522","tags":["x_refsource_MISC"],"url":"https://github.com/open-circle/valibot/pull/1522"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:7fa40d2d5aa57c04cc52739dd8e6f62cc2dd6351e5f7385e2e20431f8e19609e · sha256:c91004bf2020d0d2… · /containers/cna/references/1
{"name":"https://github.com/open-circle/valibot/releases/tag/v1.4.2","tags":["x_refsource_MISC"],"url":"https://github.com/open-circle/valibot/releases/tag/v1.4.2"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:7fa40d2d5aa57c04cc52739dd8e6f62cc2dd6351e5f7385e2e20431f8e19609e · sha256:c91004bf2020d0d2… · /containers/cna/references/3
{"name":"https://github.com/open-circle/valibot/security/advisories/GHSA-5qjj-4xww-7phc","tags":["x_refsource_CONFIRM"],"url":"https://github.com/open-circle/valibot/security/advisories/GHSA-5qjj-4xww-7phc"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:7fa40d2d5aa57c04cc52739dd8e6f62cc2dd6351e5f7385e2e20431f8e19609e · sha256:c91004bf2020d0d2… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/open-circle/valibot/security/advisories/GHSA-5qjj-4xww-7phc"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:7fa40d2d5aa57c04cc52739dd8e6f62cc2dd6351e5f7385e2e20431f8e19609e · sha256:c91004bf2020d0d2… · /containers/adp/0/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.