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CVE-2026-45820

Quick assessment

Affected
101arrowz fflate
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

101arrowz fflate是101arrowz个人开发者的一款前端压缩库。 101arrowz fflate存在资源管理错误漏洞，该漏洞源于unzipSync()函数中存在无限循环问题，可能导致攻击者通过特制的ZIP归档文件（其中央目录条目声明compressed_size=0xFFFFFFFF但缺少所需的ZIP64额外字段标签0x0001）导致拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 5

VendorProduct Version RangeStatus
101arrowz fflate 0.4.5≤ 0.4.8 affected
0.5.0≤ 0.5.3 affected
0.6.0≤ 0.6.10 affected
0.7.0≤ 0.7.4 affected
0.8.0≤ 0.8.2 affected
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I. Basic Information for CVE-2026-45820

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
101arrowz fflate 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
101arrowz fflate是101arrowz个人开发者的一款前端压缩库。 101arrowz fflate存在资源管理错误漏洞，该漏洞源于unzipSync()函数中存在无限循环问题，可能导致攻击者通过特制的ZIP归档文件（其中央目录条目声明compressed_size=0xFFFFFFFF但缺少所需的ZIP64额外字段标签0x0001）导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
101arrowz fflate 0.4.5 ~ 0.4.8 -

II. Public POCs for CVE-2026-45820

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III. Intelligence Information for CVE-2026-45820

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IV. Related Vulnerabilities

Same weakness: CWE-835

V. Comments for CVE-2026-45820

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