CVE-2026-47070 — Security Box Score

CVE · referencelatest edition

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.

CVE-2026-47070MEDIUM

benoitc hackney — HTTP/3 redirect handler leaks Authorization and Cookie headers to cross-origin redirect target in hackney

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   P   N   P   H   N   N    6.0   .0037   30.5     —

AFFECTED
  Product  Versions                                    Fixed
  hackney  3.1.1 –                                     —
  hackney  e61b7d04b7826847e1efe614106ef4d580c78eab –  —

TIMELINE
  May 18  Reserved by EEF
  May 25  EXPLOIT PUBLISHED — CVE-2026-47070 (benoitc hackney). Public exploit reference added.
  May 25  Published (CNA: EEF)

CWE-601 · CNA: EEF · CVSS v4.0 · 4 references · NVD status: Analyzed

Description

Sensitive Data Exposure vulnerability in benoitc hackney allows Retrieve Embedded Sensitive Data. The HTTP/3 redirect handler in src/hackney_h3.erl passes the original request headers unchanged to the redirect target without performing any cross-origin check. When a client issues an HTTP/3 request with follow_redirect enabled and includes Authorization or Cookie headers, a server responding with a 3xx redirect to a different host will cause the client to forward those credentials verbatim to the new origin. The main hackney.erl module has maybe_strip_auth_on_redirect/2 (guarded by the location_trusted option) to address CVE-2018-1000007, but hackney_h3.erl is missing this protection entirely. This issue affects hackney: from 3.1.1 before 4.0.1.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
May 18, 2026	Reserved	Reserved by EEF
May 25, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-47070 (benoitc hackney). Public exploit reference added.
May 25, 2026	Published	Published (CNA: EEF)

Affected

Affected products and packages — 2 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
benoitc	hackney	—	3.1.1	—
benoitc	hackney	—	e61b7d04b7826847e1efe614106ef4d580c78eab	—

Weaknesses

CWE-601

References (4)

https://cna.erlef.org/cves/CVE-2026-47070.html [Patch, Third Party Advisory]
https://github.com/benoitc/hackney/commit/c58d5b50bade146360b85caf3dc8065807b08246 [Patch]
https://github.com/benoitc/hackney/security/advisories/GHSA-h73q-4w9q-82h4 [Exploit, Patch, Vendor Advisory]
https://osv.dev/vulnerability/EEF-CVE-2026-47070 [Patch, Third Party Advisory]

Authoritative record: CVE-2026-47070 at cve.org

Vendors: benoitc

Weaknesses: CWE-601

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-47070 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.