Vulnerability · Published Sep 22, 2026 · Assigned by GitHub_M
CVE-2026-62985request-filtering-agent: Synchronous throw from createConnection() for literal private-IP hosts bypasses req.on('error'), crashing the Node.js process
High 7.5
In plain English
A high-severity security flaw in request-filtering-agent from azu. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
request-filtering-agent is an http(s).Agent implementation that blocks requests to Private/Reserved IP addresses. Prior to 3.2.1, RequestFilteringHttpAgent and RequestFilteringHttpsAgent synchronously threw from createConnection when rejecting a literal private-IP host such as 169.254.169.254 or 127.0.0.1. Because Node.js http.request and http.get expect connection failures to be delivered asynchronously, the throw bypassed req.on('error') and became an uncaught exception that could terminate the application process. Hostnames resolved through the asynchronous lookup path were not affected by this error-delivery asymmetry. This issue is fixed in version 3.2.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | request-filtering-agent | 3.2.1 | GHSA-r3r9-wp5j-pq5g |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| azu | request-filtering-agent | < 3.2.1 |
Weakness: CWE-248 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/azu/request-filtering-agent/security/advisories/GHSA-r3r9-wp5j-pq5g x_refsource_CONFIRM
- https://github.com/azu/request-filtering-agent/commit/9d12561064524807fc399158eaa5bd7a40dd8cd0 x_refsource_MISC
- https://github.com/azu/request-filtering-agent/releases/tag/v3.2.1 x_refsource_MISC