CVE-2026-115319
fzf 0.36.0 through 0.74.5 Denial of Service via maskActionContents
CVSS Score
2.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-407 |
| Vendor | junegunn |
| Product | fzf |
| Published | Oct 22, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
junegunn / fzf
0.36.0 ≤ 0.74.5
References
github.com: https://github.com/junegunn/fzf/commit/b412a450538e5f4a1d7057732e75d945dafa18a6 github.com: https://github.com/junegunn/fzf/blob/v0.74.5/src/options.go#L1680-L1736 github.com: https://github.com/junegunn/fzf vulncheck.com: https://www.vulncheck.com/advisories/fzf-0.36.0-through-0.74.5-denial-of-service-via-maskactioncontents
Credits
Zachariah Mithani (AploSec)