Bug 2494891 (CVE-2026-53433) - CVE-2026-53433 fzf: fzf: Denial of Service via inefficient HTTP body processing
Summary: CVE-2026-53433 fzf: fzf: Denial of Service via inefficient HTTP body processing
Keywords:
Status: NEW
Alias: CVE-2026-53433
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2494940 2494941
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-30 13:09 UTC by OSIDB Bzimport
Modified: 2026-06-30 14:20 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-06-30 13:09:16 UTC 
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.
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