high7.5
CVE-2026-53433
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 repea…
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/junegunn/fzf | < 0.73.1 | 0.73.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Junegunn | Fzf | before 0.73.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-mvmf-94v6-879g
- https://nvd.nist.gov/vuln/detail/CVE-2026-53433
- https://github.com/junegunn/fzf/commit/7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ce
- https://cert.pl/en/posts/2026/06/CVE-2026-53432
- https://github.com/junegunn/fzf
- https://github.com/junegunn/fzf/releases/tag/v0.73.1