Answer in brief
CVE-2026-53433 records a Medium severity (CVSS 7.5) vulnerability in fzf vulnerable to denial of service through quadratic HTTP request-body accumulation. The current sources do not mark it as known exploited. The current feed maps github.com/junegunn/fzf (go), github.com/junegunn/fzf (go). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps github.com/junegunn/fzf (go), github.com/junegunn/fzf (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| github.com/junegunn/fzfgo | <0.73.1 | 0.73.1 |
| github.com/junegunn/fzfgo | >=0 <0.73.1 | 0.73.1 |
Published upstream
Jun 30, 2026
Evidence: source:ghsa:source_dates:source-dates:recordSource modified
Oct 1, 2026
Evidence: source:ghsa:source_dates:source-dates:recordFirst seen by HOL
Jun 30, 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.
Quoted source text, attributed separately from HOL analysis.