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CVE-2026-53433— Denial of Service in fzf

Quick assessment

Affected
fzf fzf
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.

fzf fzf是fzf个人开发者的一款通用命令行模糊搜索工具。 fzf 0.73.1之前版本存在资源管理错误漏洞，该漏洞源于--listen模式下HTTP body处理效率低下，使用重复字符串拼接导致二次时间复杂度（O(n²)），可能导致精心构造的POST请求触发处理期间CPU过度使用，使单一恶意请求独占单线程HTTP服务器，阻止其他所有客户端，从而造成拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 0.21% · P12

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
fzf fzf < 0.73.1 affected
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I. Basic Information for CVE-2026-53433

Vulnerability Information
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Vulnerability Title
Denial of Service in fzf
Source: CVE Program / CVE List V5
Vulnerability Description
fzf is vulnerable to a Denial of Service (DoS) due to inefficient HTTP body processing in the --listen mode due to inefficient HTTP body processing using repeated string concatenation, resulting in quadratic time complexity (O(n²)). A crafted POST request with many small segments can trigger excessive CPU usage during request handling.This allows a single malicious request to monopolize the single‑threaded HTTP server, blocking all other clients and resulting in denial of service. This issue was fixed in version 0.73.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
fzf 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
fzf fzf是fzf个人开发者的一款通用命令行模糊搜索工具。 fzf 0.73.1之前版本存在资源管理错误漏洞，该漏洞源于--listen模式下HTTP body处理效率低下，使用重复字符串拼接导致二次时间复杂度（O(n²)），可能导致精心构造的POST请求触发处理期间CPU过度使用，使单一恶意请求独占单线程HTTP服务器，阻止其他所有客户端，从而造成拒绝服务。
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
fzf fzf 0 ~ 0.73.1 -

II. Public POCs for CVE-2026-53433

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III. Intelligence Information for CVE-2026-53433

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Patches & Fixes for CVE-2026-53433 (1)

Security Blog Posts for CVE-2026-53433 (1)

IV. Related Vulnerabilities

Same product: fzf
Same vendor: fzf
Same weakness: CWE-407

V. Comments for CVE-2026-53433

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