CVE-2026-115319
fzf 0.36.0 through 0.74.5 Denial of Service via maskActionContents
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 profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
fzf 0.36.0 through 0.74.5 Denial of Service via maskActionContents
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.
- Record
CVE-2026-115319- CVSS 4.0
- 2.0 Low
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 - CVSS 3.1
- 2.5 Low
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-407
- Updated
- 2026-11-02
EUVDEUVD-2026-108122
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.
- Record
EUVD-2026-108122- CVSS 4.0
- 2.0 Low
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-9q8r-c9q4-p63h
fzf 0.36.0 through 0.74.5 contains an inefficient algorithmic complexity vulnerability in...
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.
- Record
GHSA-9q8r-c9q4-p63h- CVSS 4.0
- 2.0 Low
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 2.5 Low
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-407
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-115319- CVSS 4.0
- 2.0 Low
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 2.5 Low
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-407
- Updated
- 2026-11-02
OSV
fzf 0.36.0 through 0.74.5 Denial of Service via maskActionContents
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.
- Record
CVE-2026-115319- CVSS 4.0
- 2.0 Low
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 - Weakness
- CWE-407
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-115319
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.
- Record
DEBIAN-CVE-2026-115319- CVSS 4.0
- 2.0 Low
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-115319
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.
- Record
UBUNTU-CVE-2026-115319- CVSS 4.0
- 2.0 Low
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 - CVSS 3.1
- 2.5 Low
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
fzfDebian:12 |
All versions, plus listed versions 0.38.0-10.42.0-10.44.1-10.46.1-10.55.0-1 Show 18 moreShow less0.56.3-10.57.0-10.58.0-10.60.0-10.60.1-10.60.2-10.60.3-10.64.0-10.65.1-10.66.0-10.67.0-10.70.0-10.72.0-10.73.1-10.74.1-10.74.3-10.74.4-10.74.5-1 |
None known |
fzfDebian:13 |
All versions, plus listed versions 0.60.3-10.64.0-10.65.1-10.66.0-10.67.0-1 Show 7 moreShow less0.70.0-10.72.0-10.73.1-10.74.1-10.74.3-10.74.4-10.74.5-1 |
None known |
fzfDebian:14 |
All versions, plus listed versions 0.60.3-10.64.0-10.65.1-10.66.0-10.67.0-1 Show 7 moreShow less0.70.0-10.72.0-10.73.1-10.74.1-10.74.3-10.74.4-10.74.5-1 |
None known |
fzfUbuntu:20.04:LTS |
All versions, plus listed versions 0.18.0-20.18.0-30.19.0-10.20.0-10.20.0-1ubuntu0.1 |
None known |
fzfUbuntu:22.04:LTS |
All versions, plus listed versions 0.24.3-10.29.0-10.29.0-1ubuntu0.1 |
None known |
fzfUbuntu:24.04:LTS |
All versions, plus listed versions 0.42.0-1build10.44.1-10.44.1-1ubuntu0.10.44.1-1ubuntu0.20.44.1-1ubuntu0.3 |
None known |
fzfUbuntu:26.10 |
All versions, plus listed versions 0.67.0-10.72.0-10.73.1-10.74.1-1 |
None known |
fzfUbuntu:26.04:LTS |
All versions, plus listed versions 0.60.3-10.66.0-10.67.0-1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-115319 is a low vulnerability (CVSS 2.0) in Fzf, published October 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.10%, the 0th percentile. No source names a fixed version.
References
github.com/junegunn/fzf/commit/b412a450538e5f4a1d7057732e75d945dafa18a6
vulncheck.com/advisories/fzf-0.36.0-through-0.74.5-denial-of-service-via-maskactioncontents
nvd.nist.gov/vuln/detail/CVE-2026-115319