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CVE-2026-12644

Versions of the package ts-deepmerge before 8.0.0 are vulnerable to Uncaught Exception due to the improper handling of built-in Object.prototype methods (such as toString, valueOf). When user-controlled input contains these keys with non-function values, the resulting merged object becomes broken — any string context operation throws a TypeError, crashing the application.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:10e5fcdc6479937cbbf502a20dd0fa93db7631c68fb4369d38250afc48e673cc
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","exploitCodeMaturity":"PROOF_OF_CONCEPT","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:f706e11bfdabc8f9812916cfc0d001cf423b208fd3d57ff7998625dfe4e289c8 · sha256:ebcc1423d3fe5aae… · /containers/cna/metrics/0/cvssV3_1

{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","exploitMaturity":"PROOF_OF_CONCEPT","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/E:P","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:f706e11bfdabc8f9812916cfc0d001cf423b208fd3d57ff7998625dfe4e289c8 · sha256:ebcc1423d3fe5aae… · /containers/cna/metrics/0/cvssV4_0
cwe · 2 assertions

{"cweId":"CWE-248","description":"CWE-248 Uncaught Exception","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f706e11bfdabc8f9812916cfc0d001cf423b208fd3d57ff7998625dfe4e289c8 · sha256:ebcc1423d3fe5aae… · /containers/adp/0/problemTypes/0/descriptions/0

{"cweId":"CWE-248","description":"Uncaught Exception","lang":"en"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f706e11bfdabc8f9812916cfc0d001cf423b208fd3d57ff7998625dfe4e289c8 · sha256:ebcc1423d3fe5aae… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"ts-deepmerge","vendor":"n/a","versions":[{"lessThan":"8.0.0","status":"affected","version":"0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f706e11bfdabc8f9812916cfc0d001cf423b208fd3d57ff7998625dfe4e289c8 · sha256:ebcc1423d3fe5aae… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","exploitCodeMaturity":"PROOF_OF_CONCEPT","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:f706e11bfdabc8f9812916cfc0d001cf423b208fd3d57ff7998625dfe4e289c8 · sha256:ebcc1423d3fe5aae… · /containers/cna/metrics/0/cvssV3_1
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","exploitMaturity":"PROOF_OF_CONCEPT","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/E:P","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:f706e11bfdabc8f9812916cfc0d001cf423b208fd3d57ff7998625dfe4e289c8 · sha256:ebcc1423d3fe5aae… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-248","description":"CWE-248 Uncaught Exception","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f706e11bfdabc8f9812916cfc0d001cf423b208fd3d57ff7998625dfe4e289c8 · sha256:ebcc1423d3fe5aae… · /containers/adp/0/problemTypes/0/descriptions/0
{"cweId":"CWE-248","description":"Uncaught Exception","lang":"en"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f706e11bfdabc8f9812916cfc0d001cf423b208fd3d57ff7998625dfe4e289c8 · sha256:ebcc1423d3fe5aae… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"url":"https://gist.github.com/igorg1312/775fa00114c4d47df6ae0551779ab407"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f706e11bfdabc8f9812916cfc0d001cf423b208fd3d57ff7998625dfe4e289c8 · sha256:ebcc1423d3fe5aae… · /containers/cna/references/1
{"tags":["exploit"],"url":"https://gist.github.com/igorg1312/775fa00114c4d47df6ae0551779ab407"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f706e11bfdabc8f9812916cfc0d001cf423b208fd3d57ff7998625dfe4e289c8 · sha256:ebcc1423d3fe5aae… · /containers/adp/0/references/0
{"url":"https://github.com/voodoocreation/ts-deepmerge/commit/305a05831a462fb2c353d3cbbff55a0733286f8c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f706e11bfdabc8f9812916cfc0d001cf423b208fd3d57ff7998625dfe4e289c8 · sha256:ebcc1423d3fe5aae… · /containers/cna/references/2
{"url":"https://security.snyk.io/vuln/SNYK-JS-TSDEEPMERGE-17339141"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f706e11bfdabc8f9812916cfc0d001cf423b208fd3d57ff7998625dfe4e289c8 · sha256:ebcc1423d3fe5aae… · /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.

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