CVE Explorer

CVE-2026-45820

fflate through 0.8.2 is vulnerable to denial of service via an infinite loop in unzipSync(). A crafted ZIP archive with a central directory entry declaring compressed_size=0xFFFFFFFF (ZIP64 sentinel) but missing the required ZIP64 extra field tag 0x0001 causes z64e() to loop indefinitely due to out-of-bounds reads returning undefined, which coerces to 0, keeping the loop condition permanently true.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ee03165a2ec3f255210fa0501ea66dafb33761e1dd2f7dfe2007942cf6f508aa

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-835","description":"CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:6553bef5224743b702cd9138e0fd51b4b87b0c44b9210614356814680b30a86c · sha256:3321efbef4f3433b… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-400","description":"CWE-400 Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:6553bef5224743b702cd9138e0fd51b4b87b0c44b9210614356814680b30a86c · sha256:3321efbef4f3433b… · /containers/cna/problemTypes/0/descriptions/1

Affected products and versions

1 source assertion

{"defaultStatus":"unaffected","platforms":["Linux","macOS","Windows"],"product":"fflate","vendor":"101arrowz","versions":[{"lessThanOrEqual":"0.4.8","status":"affected","version":"0.4.5","versionType":"semver"},{"lessThanOrEqual":"0.5.3","status":"affected","version":"0.5.0","versionType":"semver"},{"lessThanOrEqual":"0.6.10","status":"affected","version":"0.6.0","versionType":"semver"},{"lessThanOrEqual":"0.7.4","status":"affected","version":"0.7.0","versionType":"semver"},{"lessThanOrEqual":"0.8.2","status":"affected","version":"0.8.0","versionType":"semver"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:6553bef5224743b702cd9138e0fd51b4b87b0c44b9210614356814680b30a86c · sha256:3321efbef4f3433b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"Automatable":"YES","Recovery":"USER","Safety":"NEGLIGIBLE","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.6,"baseSeverity":"MEDIUM","exploitMaturity":"UNREPORTED","privilegesRequired":"NONE","providerUrgency":"AMBER","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"DIFFUSE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/S:N/AU:Y/R:U/V:D/RE:M/U:Amber","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentiality…

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:6553bef5224743b702cd9138e0fd51b4b87b0c44b9210614356814680b30a86c · sha256:3321efbef4f3433b… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions

{"cweId":"CWE-835","description":"CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:6553bef5224743b702cd9138e0fd51b4b87b0c44b9210614356814680b30a86c · sha256:3321efbef4f3433b… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-400","description":"CWE-400 Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:6553bef5224743b702cd9138e0fd51b4b87b0c44b9210614356814680b30a86c · sha256:3321efbef4f3433b… · /containers/cna/problemTypes/0/descriptions/1

Source references

2 source assertions

{"url":"https://github.com/101arrowz/fflate/blob/f7873560ad229c22c4b23b06c6a3806ffde77569/src/index.ts#L2714"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:6553bef5224743b702cd9138e0fd51b4b87b0c44b9210614356814680b30a86c · sha256:3321efbef4f3433b… · /containers/cna/references/0

{"url":"https://www.npmjs.com/package/fflate"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:6553bef5224743b702cd9138e0fd51b4b87b0c44b9210614356814680b30a86c · sha256:3321efbef4f3433b… · /containers/cna/references/1

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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