CVE-2026-45820GHSA-PX8P-9VWX-VF98
fflate through 0.8.2 is vulnerable to denial of service via an infinite loop in unzipSync().
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 0.4.9, 0.5.4, 0.6.11, 0.7.5, 0.8.3
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: yes
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- 101arrowz fflate
From 0.4.5 · through 0.4.8; From 0.5.0 · through 0.5.3; From 0.6.0 · through 0.6.10; From 0.7.0 · through 0.7.4; From 0.8.0 · through 0.8.2
- fflatenpm
From 0.4.5 · fixed in 0.4.9
- fflatenpm
From 0.5.0 · fixed in 0.5.4
- fflatenpm
From 0.6.0 · fixed in 0.6.11
- fflatenpm
From 0.7.0 · fixed in 0.7.5
- fflatenpm
From 0.8.0 · fixed in 0.8.3