CVE Explorer
CVE-2026-27601
Underscore.js is a utility-belt library for JavaScript. Prior to 1.13.8, the _.flatten and _.isEqual functions use recursion without a depth limit. Under very specific conditions, detailed below, an attacker could exploit this in a Denial of Service (DoS) attack by triggering a stack overflow. Untrusted input must be used to create a recursive datastructure, for example using JSON.parse, with no enforced depth limit. The datastructure thus created must be passed to _.flatten or _.isEqual. In the
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"underscore","vendor":"jashkenas","versions":[{"status":"affected","version":"< 1.13.8"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:8ff5d6b8c6ac05b2b8c01b58a91f58af34949b36372205cc1a3943cf10dd4f7c · sha256:74152bd5236c7759… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.2,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:8ff5d6b8c6ac05b2b8c01b58a91f58af34949b36372205cc1a3943cf10dd4f7c · sha256:74152bd5236c7759… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:8ff5d6b8c6ac05b2b8c01b58a91f58af34949b36372205cc1a3943cf10dd4f7c · sha256:74152bd5236c7759… · /containers/cna/problemTypes/0/descriptions/0
Source references
3 source assertions{"name":"https://github.com/jashkenas/underscore/commit/411e222eb0ca5d570cc4f6315c02c05b830ed2b4","tags":["x_refsource_MISC"],"url":"https://github.com/jashkenas/underscore/commit/411e222eb0ca5d570cc4f6315c02c05b830ed2b4"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:8ff5d6b8c6ac05b2b8c01b58a91f58af34949b36372205cc1a3943cf10dd4f7c · sha256:74152bd5236c7759… · /containers/cna/references/1
{"name":"https://github.com/jashkenas/underscore/commit/a6e23ae9647461ec33ad9f92a2ecfc220eea0a84","tags":["x_refsource_MISC"],"url":"https://github.com/jashkenas/underscore/commit/a6e23ae9647461ec33ad9f92a2ecfc220eea0a84"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:8ff5d6b8c6ac05b2b8c01b58a91f58af34949b36372205cc1a3943cf10dd4f7c · sha256:74152bd5236c7759… · /containers/cna/references/2
{"name":"https://github.com/jashkenas/underscore/security/advisories/GHSA-qpx9-hpmf-5gmw","tags":["x_refsource_CONFIRM"],"url":"https://github.com/jashkenas/underscore/security/advisories/GHSA-qpx9-hpmf-5gmw"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:8ff5d6b8c6ac05b2b8c01b58a91f58af34949b36372205cc1a3943cf10dd4f7c · sha256:74152bd5236c7759… · /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.