Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-3783

CVE-2026-3783MEDIUM

curl curl — token leak with redirect and netrc

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  L  N  N    5.3   .0050   41.0     —

AFFECTED
  Product  Versions                                    Fixed
  curl     7.33.0 –                                    —
  curl     06c1bea72faabb6fad4b7ef818aafaa336c9a7aa –  —
  curl     8.18.0 –                                    —

TIMELINE
  Mar 8   Reserved by curl
  Mar 11  Published (CNA: curl)
  Sep 15  EXPLOIT PUBLISHED — CVE-2026-3783 (curl). Public exploit reference added.

CWE-522 · CNA: curl · CVSS v3.1 · 4 references · NVD status: Modified

Description

When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a redirect to a second URL, curl could leak that token to the second hostname under some circumstances. If the hostname that the first request is redirected to has information in the used .netrc file, with either of the `machine` or `default` keywords, curl would pass on the bearer token set for the first host also to the second one.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
March 8, 2026	Reserved	Reserved by curl
March 11, 2026	Published	Published (CNA: curl)
September 15, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-3783 (curl). Public exploit reference added.

Affected

Affected products and packages — 3 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
curl	curl	—	7.33.0	—
curl	curl	—	06c1bea72faabb6fad4b7ef818aafaa336c9a7aa	—
curl	curl	—	8.18.0	—

Weaknesses

CWE-522

References (4)

http://www.openwall.com/lists/oss-security/2026/03/11/2 [Mailing List, Third Party Advisory]
https://curl.se/docs/CVE-2026-3783.html [Patch, Vendor Advisory]
https://curl.se/docs/CVE-2026-3783.json [Vendor Advisory]
https://hackerone.com/reports/3583983 [Exploit, Issue Tracking, Third Party Advisory]

Authoritative record: CVE-2026-3783 at cve.org

Vendors: curl

Weaknesses: CWE-522

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-3783 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 Sunday, October 4, 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.