CVE-2026-45820
CVE-2026-45820
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 6.6 · Medium · EPSS 0.3% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
fflate
- Versions
- ≥ 0.4.5, ≤ 0.4.8: Affected (semver)
- ≥ 0.5.0, ≤ 0.5.3: Affected (semver)
- ≥ 0.6.0, ≤ 0.6.10: Affected (semver)
- ≥ 0.7.0, ≤ 0.7.4: Affected (semver)
- ≥ 0.8.0, ≤ 0.8.2: Affected (semver)
No fix published
fflate npm
- Affected ranges
- SEMVER: ≥ 0.4.5, < 0.4.9
Update to 0.4.9
fflate npm
- Affected ranges
- SEMVER: ≥ 0.5.0, < 0.5.4
Update to 0.5.4
fflate npm
- Affected ranges
- SEMVER: ≥ 0.6.0, < 0.6.11
Update to 0.6.11
fflate npm
- Affected ranges
- SEMVER: ≥ 0.7.0, < 0.7.5
Update to 0.7.5
fflate npm
- Affected ranges
- SEMVER: ≥ 0.8.0, < 0.8.3
Update to 0.8.3