CVE-2026-45820

Severity CVSS v4.0:

MEDIUM

Type:

CWE-400 Uncontrolled Resource Consumption ('Resource Exhaustion')

Publication date:

22/07/2026

Last modified:

22/07/2026

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.

Impact

Vector 4.0

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/S:N/AU:Y/R:U/V:D/RE:M/U:Amber CVSS v4.0 Severity and Metrics:

Base Score: 6.60 MEDIUM
Vector: 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/S:N/AU:Y/R:U/V:D/RE:M/U:Amber

Attack Vector (AV): Network
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): None
User Interaction (UI): None
Confidentiality (VC): None
Integrity (VI): None
Availability (VA): High
Confidentiality (SC): None
Integrity (SI): None
Availability (SA): None
Safety (S): Negligible
Automatable (AU): Yes
Recovery (R): User
Value Density (V): Diffuse
Vulnerability Response Effort (RE): Moderate
Provider Urgency (U): Amber
Exploit Maturity (E): Unreported

Base Score 4.0

6.60

Severity 4.0

MEDIUM

CVE-2026-45820

Description

Impact

References to Advisories, Solutions, and Tools