CVE catalog
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 repeated string concatenation, resulting in qu
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.38% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | fzf | sid | 0.74.5-1 | fixed |
| Debian | fzf | forky | 0.74.5-1 | fixed |
| Debian | fzf | trixie | 0.60.3-1 | vulnerable |
| Debian | fzf | bookworm | 0.38.0-1 | vulnerable |
| Cpe | fzf | Not reported | Not reported | vulnerable |
| Cpe | fzf | Not reported | 0.73.1 | fixed |
| Go | github.com/junegunn/fzf | Not reported | 0.73.1 | fixed |
| Ubuntu | fzf | 20.04 | 0.18.0-2 | vulnerable |
| Ubuntu | fzf | 20.04 | 0.18.0-3 | vulnerable |
| Ubuntu | fzf | 20.04 | 0.19.0-1 | vulnerable |
| Ubuntu | fzf | 20.04 | 0.20.0-1 | vulnerable |
| Ubuntu | fzf | 20.04 | 0.20.0-1ubuntu0.1 | vulnerable |
| Ubuntu | fzf | 22.04 | 0.24.3-1 | vulnerable |
| Ubuntu | fzf | 22.04 | 0.29.0-1 | vulnerable |
| Ubuntu | fzf | 22.04 | 0.29.0-1ubuntu0.1 | vulnerable |
| Ubuntu | fzf | 24.04 | 0.42.0-1build1 | vulnerable |
| Ubuntu | fzf | 24.04 | 0.44.1-1 | vulnerable |
| Ubuntu | fzf | 24.04 | 0.44.1-1ubuntu0.1 | vulnerable |
| Ubuntu | fzf | 24.04 | 0.44.1-1ubuntu0.2 | vulnerable |
| Ubuntu | fzf | 24.04 | 0.44.1-1ubuntu0.3 | vulnerable |
| Ubuntu | fzf | 25.10 | 0.60.3-1 | vulnerable |
| Ubuntu | fzf | 26.04 | 0.60.3-1 | vulnerable |
| Ubuntu | fzf | 26.04 | 0.66.0-1 | vulnerable |
| Ubuntu | fzf | 26.04 | 0.67.0-1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | fzf | source | sid | 0.73.1-1 | unimportant | Not reported | Not reported |
| Debian | fzf | source | forky | 0.73.1-1 | unimportant | Not reported | Not reported |
| Debian | fzf | source | trixie | (unfixed) | unimportant | Not reported | Not reported |
| Debian | fzf | source | bookworm | (unfixed) | unimportant | Not reported | Not reported |
| Cpe | fzf | cpe | Not reported | 0.73.1 | Not reported | Not reported | Not reported |
| Go | github.com/junegunn/fzf | go | Not reported | 0.73.1 | Not reported | GHSA-MVMF-94V6-879G | Not reported |
OpenFactory catalog packages
References
- [https://github.com/advisories/GHSA-mvmf-94v6-879g]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-53433]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-53433]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-53433]
- [https://security-tracker.debian.org/tracker/CVE-2026-53433]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53433.json]
[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]