CVE-2026-45820
MEDIUM101arrowz Fflate - Uncontrolled Resource Consumption
Title source: ruleDescription
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.
References (2)
Core 2
Scores
CVSS v4
6.6
EPSS
0.0026
EPSS Percentile
17.1%
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:Y/R:U/V:D/RE:M/U:Amber
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-400
CWE-835
Status
published
Products (5)
101arrowz/fflate
0.4.5 - 0.4.8
101arrowz/fflate
0.5.0 - 0.5.3
101arrowz/fflate
0.6.0 - 0.6.10
101arrowz/fflate
0.7.0 - 0.7.4
101arrowz/fflate
0.8.0 - 0.8.2
Published
Jul 22, 2026
Tracked Since
Jul 22, 2026