Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L L N U H H H 8.8 .0034 27.7 —
AFFECTED Product Versions Fixed undici 7.23.0 – 7.26.0
TIMELINE Apr 20 Reserved by openjs Jun 17 Published (CNA: openjs) Aug 3 RESCORED — CVE-2026-6734 (undici). CVSS 7.5 → 8.8 (NVD).
Impact: When using Socks5ProxyAgent, undici reuses a single connection pool across different origins without verifying that the pool's origin matches the requested origin. All requests are dispatched through the pool connected to the first origin, regardless of the intended destination. This causes cross-origin request routing: credentials and request data intended for origin B are sent to origin A, responses from the wrong origin are trusted, and HTTPS requests may be silently downgraded to HTTP. Impacted users are applications that use Socks5ProxyAgent (directly or via setGlobalDispatcher) and make requests to more than one origin. This was introduced in undici 7.23.0 via PR #4385 and affects all versions through 8.1.0. Patches: Upgrade to undici v7.26.0 or v8.2.0. Workarounds: Use a separate Socks5ProxyAgent instance per origin, or avoid using Socks5ProxyAgent with multiple origins.
| Date | Event | Detail |
|---|---|---|
| April 20, 2026 | Reserved | Reserved by openjs |
| June 17, 2026 | Published | Published (CNA: openjs) |
| August 3, 2026 | RESCORED | RESCORED — CVE-2026-6734 (undici). CVSS 7.5 → 8.8 (NVD). |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| undici | undici | — | 7.23.0 | 7.26.0 |
Authoritative record: CVE-2026-6734 at cve.org
Vendors: undici
Weaknesses: CWE-346
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-6734 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.