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CVE-2026-45820

101arrowz / fflate PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
101arrowz / fflateaffected 0.4.5 through 0.4.8; affected 0.5.0 through 0.5.3; affected 0.6.0 through 0.6.10; affected 0.7.0 through 0.7.4; affected 0.8.0 through 0.8.2

CWE

CWE-835, CWE-400

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.