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CVE-2026-115319— fzf 0.36.0 through 0.74.5 Denial of Service via maskActionContents

Quick assessment

Affected
junegunn 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 0.36.0 至 0.74.5 版本中， 函数存在算法复杂度低效的漏洞。该漏洞允许本地攻击者通过二次方字符串拼接操作，耗尽 HTTP 服务器的资源。攻击者可以向未认证的 localhost 端口反复发送约 1 MB 的 POST 请求体，每次操作会导致单线程服务器阻塞约 30 秒。

CVSS 2.5 · Low

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

Affected Version Matrix 1

VendorProduct Version RangeStatus
junegunn fzf 0.36.0≤ 0.74.5 affected
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I. Basic Information for CVE-2026-115319

Vulnerability Information
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Vulnerability Title
fzf 0.36.0 through 0.74.5 Denial of Service via maskActionContents
Source: CVE Program / CVE List V5
Vulnerability Description
fzf 0.36.0 through 0.74.5 contains an inefficient algorithmic complexity vulnerability in maskActionContents that allows local attackers to exhaust the --listen HTTP server through quadratic string concatenation. Attackers can repeatedly send POST bodies of about 1 MB to the unauthenticated localhost port, blocking the single-threaded server for about 30 seconds each time.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
junegunn fzf 0.36.0 ~ 0.74.5 -

II. Public POCs for CVE-2026-115319

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III. Intelligence Information for CVE-2026-115319

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Patches & Fixes for CVE-2026-115319 (1)

Vendor Pages for CVE-2026-115319 (1)

IV. Related Vulnerabilities

Same product: fzf
Same weakness: CWE-407

V. Comments for CVE-2026-115319

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