René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`dns.lookupService` triggers a SIGABRT when passed a Buffer","articleBody":"### Version\n\nv26.5.1\n\n### Platform\n\n```text\nLinux bombe-mint 6.8.0-136-generic #136-Ubuntu SMP PREEMPT_DYNAMIC Wed Jul  1 21:53:05 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux\n```\n\n### Subsystem\n\n_No response_\n\n### What steps will reproduce the bug?\n\nRun the following code with `node test.js`:\n```js\nconst dns = require('dns');\n\nconst invalidAddress = Buffer.from('127.0.0.1');\ndns.lookupService(invalidAddress, 80, (err) => console.log(err))\n```\n\n### How often does it reproduce? Is there a required condition?\n\nIt reproduces reliably every time that the above code is run.\n\n### What is the expected behavior? Why is that the expected behavior?\n\nWhen an invalid address is passed, a TypeError should be thrown like:\n```js\nTypeError [ERR_INVALID_ARG_VALUE]: The argument 'address' is invalid.\n```\n\n### What do you see instead?\n\n```js\n  #  /usr/local/n/versions/node/26.5.1/bin/node[144772]: void node::cares_wrap::(anonymous namespace)::GetNameInfo(const FunctionCallbackInfo\u003cValue> &) at ../src/cares_wrap.cc:2048\n  #  Assertion failed: args[1]->IsString()\n\n----- Native stack trace -----\n\n 1: 0x81d228 node::Assert(node::AssertionInfo const&) [/usr/local/n/versions/node/26.5.1/bin/node]\n 2: 0x8b268a  [/usr/local/n/versions/node/26.5.1/bin/node]\n 3: 0x70aca7dcfae9 \n\n----- JavaScript stack trace -----\n\n1: lookupService (node:dns:288:21)\n2: /home/username/test.js:4:5\n3: node:internal/modules/cjs/loader:1934:14\n4: node:internal/modules/cjs/loader:2074:10\n5: node:internal/modules/cjs/loader:1656:32\n6: node:internal/modules/cjs/loader:1448:12\n7: wrapModuleLoad (node:internal/modules/cjs/loader:261:19)\n8: executeUserEntryPoint (node:internal/modules/run_main:154:5)\n9: node:internal/main/run_main_module:33:47\n\n\nAborted (core dumped)\n```\n\n### Additional information\n\nIt looks like there is some missing input validation on the JavaScript side. The issue is however caught by the underlying cpp code, preventing security issues.","author":{"url":"https://github.com/davidebombelli","@type":"Person","name":"davidebombelli"},"datePublished":"2026-07-31T17:30:16Z","url":"https://github.com/nodejs/node/issues/64877"}