CVE-2026-45820
High · 7.5CVSS
7.5
EPSS
0.3%
Published
Jul 22, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
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