Bug 2506034 (CVE-2026-45820) - CVE-2026-45820 fflate: fflate: Denial of Service via crafted ZIP archives
Summary: CVE-2026-45820 fflate: fflate: Denial of Service via crafted ZIP archives
Keywords:
Status: NEW
Alias: CVE-2026-45820
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2523742 2523743
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-22 08:01 UTC by OSIDB Bzimport
Modified: 2026-08-25 20:22 UTC (History)
58 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:


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Description OSIDB Bzimport 2026-07-22 08:01:22 UTC
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.


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