# undici vulnerable to TLS certificate validation bypass via dropped tls options in Agent Advisory record · `GHSA-2m5v-pch6-74hx` - **Identifiers:** `GHSA-2m5v-pch6-74hx` · `CVE-2026-109383` - **State:** Confirmed - **Severity:** CVSS 7.4 High - **Critical:** No - **Weakness (CWE):** [CWE-295](https://cwe.mitre.org/data/definitions/295.html) - **Tags:** [Weak cryptography or TLS](https://agentprime.io/advisories/tag/weak-crypto.md) - **Published:** 27 Oct 2026 - **Updated:** 27 Oct 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 27 Oct 2026, 19:02 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `undici` (npm): affected `>=4.0.0, <6.29.1 || >=7.0.0, <7.30.1 || >=8.0.0, <8.12.2`; fixed in `6.29.1`, `7.30.1`, `8.12.2` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > Undici versions 4.0.0 up to but not including 6.29.1, 7.0.0 up to but not including 7.30.1, and 8.0.0 up to but not including 8.12.2 are affected. When a caller passes a custom checkServerIdentity callback through the tls option of Agent, the JSON-based cloning drops the function, so a server whose certificate the callback should reject is accepted if it passes Node's default checks. Upgrade to undici 6.29.1, 7.30.1, or 8.12.2, which forward the tls option unchanged; if upgrading is not possible, pass TLS options through connect instead. Written 31 Oct 2026. ## Not analysed yet We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check. ## Severity and exploitation - 7.4 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N`, from CNA (openjs) - **CISA KEV:** Not listed. - **EPSS:** 0.0018, the 8th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 31 Oct 2026, 13:33 UTC: First seen by agentprime - 31 Oct 2026, 13:33 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-2m5v-pch6-74hx) ## Sources - [GitHub Advisory Database: GHSA-2m5v-pch6-74hx](https://github.com/advisories/GHSA-2m5v-pch6-74hx) - [OSV: GHSA-2m5v-pch6-74hx](https://osv.dev/vulnerability/GHSA-2m5v-pch6-74hx) - - - - - - - - - - Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code. ## Check whether this affects you A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet. - With the agentprime MCP server (), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .