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CVE-2026-67214

nanoid (Nano ID) before 5.1.16 contains an infinite loop in the customAlphabet and nanoid functions of its non-secure module (nanoid/non-secure). When these functions are given a negative size, the loop counter is decremented from a negative value and never reaches its termination condition, spinning indefinitely and hanging the calling thread. An application that passes an unvalidated, attacker-controlled negative size to these functions is exposed to a denial-of-service condition.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:90f3713fd1a3ea1a5d3d461289932944838fccf9a3752122b25d6118c0469c29
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b8ee9c4be2ece44fd80d5b2e50532680eb41c4894fca17661b851a328c6a8434 · sha256:dfd26aeb0cd991bd… · /containers/cna/metrics/1/cvssV3_1

{"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_v5cvss
    urn:baitaphish:normalized-source-record:v2:b8ee9c4be2ece44fd80d5b2e50532680eb41c4894fca17661b851a328c6a8434 · sha256:dfd26aeb0cd991bd… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"nanoid","vendor":"nanoid_project","versions":[{"lessThan":"5.1.16","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"5.1.16","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b8ee9c4be2ece44fd80d5b2e50532680eb41c4894fca17661b851a328c6a8434 · sha256:dfd26aeb0cd991bd… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b8ee9c4be2ece44fd80d5b2e50532680eb41c4894fca17661b851a328c6a8434 · sha256:dfd26aeb0cd991bd… · /containers/cna/metrics/1/cvssV3_1
{"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_v5cvss
    urn:baitaphish:normalized-source-record:v2:b8ee9c4be2ece44fd80d5b2e50532680eb41c4894fca17661b851a328c6a8434 · sha256:dfd26aeb0cd991bd… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-835","description":"Loop with Unreachable Exit Condition ('Infinite Loop')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b8ee9c4be2ece44fd80d5b2e50532680eb41c4894fca17661b851a328c6a8434 · sha256:dfd26aeb0cd991bd… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"Fix commit (stop negative size from looping forever)","tags":["patch"],"url":"https://github.com/ai/nanoid/commit/6ccc67bbaba71d3d77a21d9b636f4171a268ce49"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b8ee9c4be2ece44fd80d5b2e50532680eb41c4894fca17661b851a328c6a8434 · sha256:dfd26aeb0cd991bd… · /containers/cna/references/1
{"name":"nanoid 5.1.16 release notes","tags":["release-notes"],"url":"https://github.com/ai/nanoid/releases/tag/5.1.16"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b8ee9c4be2ece44fd80d5b2e50532680eb41c4894fca17661b851a328c6a8434 · sha256:dfd26aeb0cd991bd… · /containers/cna/references/0
{"name":"VulnCheck Advisory: nanoid before 5.1.16 Infinite Loop via Negative Size in non-secure module","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/nanoid-before-infinite-loop-via-negative-size-in-non-secure-module"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b8ee9c4be2ece44fd80d5b2e50532680eb41c4894fca17661b851a328c6a8434 · sha256:dfd26aeb0cd991bd… · /containers/cna/references/2

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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