CVSS 4.0
5.7 mediumCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NCVE-2026-53433
Medium (5.7) in junegunn fzf. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in github.com/junegunn/fzf 0.73.1.
fzf is vulnerable to a Denial of Service (DoS) due to inefficient HTTP body processing in the --listen mode due to inefficient HTTP body processing using repeated string concatenation, resulting in quadratic time complexity (O(n²)). A crafted POST request with many small segments can trigger excessive CPU usage during request handling.This allows a single malicious request to monopolize the single‑threaded HTTP server, blocking all other clients and resulting in denial of service.
This issue was fixed in version 0.73.1.
Severity
CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 31% of CVEs (scores of 2026-10-31)
- CWE
- CWE-407
- Published
- Modified
- Record from
- the NVD, synced
Affected
- junegunn:fzf
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-mvmf-94v6-879g | Go | github.com/junegunn/fzf | <0.73.1 | 0.73.1 |
| GO-2026-6620 | Go | github.com/junegunn/fzf | <0.73.1 | 0.73.1 |