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-2026-9079

CVE-2026-9079CRITICAL

curl curl — stale proxy password leak

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  H  H  H    9.8   .0058   46.0     —

AFFECTED
  Product  Versions                                    Fixed
  curl     8.8.0 –                                     —
  curl     d5e83eb745762f48d8fafadc5df5dd3ae8d8941e –  —
  curl     8.20.0 –                                    —

TIMELINE
  May 20  Reserved by curl
  Jul 3   EXPLOIT PUBLISHED — CVE-2026-9079 (curl). Public exploit reference added.
  Jul 3   Published (CNA: curl)
  Sep 15  EXPLOIT PUBLISHED — CVE-2026-9079 (curl). Public exploit reference added.

CWE-522 · CNA: curl · CVSS v3.1 · 3 references · NVD status: Modified

Description

libcurl had a flaw that when instructed to clear proxy authentication credentials which made it not do so, leaving the old credentials around to get used for subsequent transfers that should not know nor use them.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
May 20, 2026	Reserved	Reserved by curl
July 3, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-9079 (curl). Public exploit reference added.
July 3, 2026	Published	Published (CNA: curl)
September 15, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-9079 (curl). Public exploit reference added.

Affected

Affected products and packages — 3 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
curl	curl	—	8.8.0	—
curl	curl	—	d5e83eb745762f48d8fafadc5df5dd3ae8d8941e	—
curl	curl	—	8.20.0	—

Weaknesses

CWE-522

References (3)

https://curl.se/docs/CVE-2026-9079.html [Patch, Vendor Advisory]
https://curl.se/docs/CVE-2026-9079.json [Vendor Advisory]
https://hackerone.com/reports/3750295 [Exploit, Issue Tracking, Third Party Advisory]

Authoritative record: CVE-2026-9079 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-2026-9079 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.