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.

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
junegunn fzf unaffected
Version Status Constraints
0.36.0 affected ≤ 0.74.5

No data.

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Project Subscriptions

Vendors Products
Junegunn Subscribe
Fzf Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/junegunn/fzf cve-icon cve-icon
https://github.com/junegunn/fzf/blob/v0.74.5/src/options.go#L1680-L1736 cve-icon cve-icon
https://github.com/junegunn/fzf/commit/b412a450538e5f4a1d7057732e75d945dafa18a6 cve-icon cve-icon
https://www.vulncheck.com/advisories/fzf-0.36.0-through-0.74.5-denial-of-service-via-maskactioncontents cve-icon cve-icon
History

Thu, 22 Oct 2026 11:00:00 +0000

Type Values Removed Values Added
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.
Title fzf 0.36.0 through 0.74.5 Denial of Service via maskActionContents
First Time appeared Junegunn
Junegunn fzf
Weaknesses CWE-407
CPEs cpe:2.3:a:junegunn:fzf:*:*:*:*:*:*:*:*
Vendors & Products Junegunn
Junegunn fzf
References
Metrics cvssV3_1

{'score': 2.5, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L'}

cvssV4_0

{'score': 2, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-22T10:57:40.288Z

Reserved: 2026-10-22T10:11:36.987Z

Link: CVE-2026-115319

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-22T11:17:50.677

Modified: 2026-10-22T11:17:50.677

Link: CVE-2026-115319

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses