Low severity · published Oct 22, 2026
CVE-2026-115319
fzf 0.36.0 through 0.74.5 Denial of Service via maskActionContents
New
2.5
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 1% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FZ
fzf · junegunn
0.36.0 through 0.74.5 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-115319
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-115319
github.com
https://github.com/junegunn/fzf
github.com
https://github.com/junegunn/fzf/blob/v0.74.5/src/options.go#L1680-L1736
github.com
https://github.com/junegunn/fzf/commit/b412a450538e5f4a1d7057732e75d945dafa18a6
www.vulncheck.com
https://www.vulncheck.com/advisories/fzf-0.36.0-through-0.74.5-denial-of-service-via-maskactioncontents