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.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 101arrowz | fflate | unaffected |
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Advisories
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Fixes
Solution
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Workaround
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References
History
Wed, 22 Jul 2026 07:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Weaknesses | CWE-400 CWE-835 |
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| Metrics |
cvssV4_0
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Projects
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MITRE
Status: PUBLISHED
Assigner: seal
Published:
Updated: 2026-07-22T06:57:13.726Z
Reserved: 2026-05-13T12:03:13.544Z
Link: CVE-2026-45820
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
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