CVE-2026-45820
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk20th percentile - higher than 20% of all known CVEs
Summary
The fflate library up to version 0.8.2 is vulnerable to denial of service via an infinite loop in unzipSync(). A crafted ZIP archive with compressed_size=0xFFFFFFFF (ZIP64 sentinel) without the required ZIP64 extra field causes an infinite loop due to out-of-bounds reads.
Risk Assessment
The risk is potential blocking of applications using fflate for decompression, leading to denial of service.
Recommendation
Upgrade fflate to version 0.8.3 or later. As a workaround, avoid decompressing untrusted ZIP archives.
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Original NVD description (English source)
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.