Description
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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| fzf | fzf | < 0.73.1 | 0.73.1 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | fzf | 0.73.1-1 | — |
| Debian 13 | fzf | No fix yet | — |
| Debian 12 | fzf | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | fzf | No fix yet | — |
| Ubuntu 25.10 | fzf | No fix yet | — |
| Ubuntu 24.04 LTS | fzf | No fix yet | — |
| Ubuntu 22.04 LTS | fzf | No fix yet | — |
| Ubuntu 20.04 LTS | fzf | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/junegunn/fzf | < 0.73.1 | 0.73.1 | GHSA-mvmf-94v6-879g |
References
- https://cert.pl/en/posts/2026/06/CVE-2026-53432 third-party-advisory
- https://github.com/junegunn/fzf product
- https://github.com/junegunn/fzf/commit/7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ce issue-tracking