fzf vulnerabilities

fzf versions 0.36.0 through 0.74.5 contain an inefficient algorithmic complexity vulnerability in maskActionContents that lets local attackers exhaust the --listen HTTP server via quadratic string concatenation. Repeatedly sending ~1 MB POST bodies to the unauthenticated localhost port blocks the single-threaded server for about 30 seconds each time.

A vulnerability in fzf's --listen mode causes a Denial of Service (DoS) 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, monopolizing the single-threaded HTTP server and blocking all other clients.

An integer overflow vulnerability was discovered in the fzf tool within the FuzzyMatchV2 function. When the input line length is approximately 2,200,000 bytes and the pattern length is 999 bytes, an overflow occurs, leading to invalid slice bounds. The Go runtime detects this and immediately terminates the process with a non-recoverable panic.