CVE-2026-45820
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-835 CWE-400 |
| Vendor | 101arrowz |
| Product | fflate |
| Published | Jul 22, 2026 |
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Affected Versions
101arrowz / fflate
0.4.5 ≤ 0.4.8 0.5.0 ≤ 0.5.3 0.6.0 ≤ 0.6.10 0.7.0 ≤ 0.7.4 0.8.0 ≤ 0.8.2
References
Credits
Seal Security