CVE-2026-9546

HIGHPre-NVD 7.5Trending — 5 sources updated this weekElevated
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A vulnerability in libcurl caused the HTTP Referer: header to persist even when explicitly cleared. While the documentation states that passing NULL to CURLOPT_REFERER suppresses the header, the option failed to clear the internal state. As a result the previous referrer string was erroneously reused and sent in subsequent requests, potentially leaking sensitive information to unintended servers.

CVSS v3
7.5
EG Score
0.0(none)
EPSS
10.8%
KEV
Not listed

Published

July 3, 2026

Last Modified

July 6, 2026

Advisory Details (3)

Auto-updated Jul 7, 2026
No patch confirmed yet.
generic

HackerOne

https://hackerone.com/reports/3754343
generic
https://curl.se/docs/CVE-2026-9546.json
generic

curl - sending old referer - CVE-2026-9546

https://curl.se/docs/CVE-2026-9546.html

Vendor Advisories for CVE-2026-9546(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 7× in last 7d / 7× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 17:36 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 11:10 UTCEG score recompute
  4. 2026-07-06 11:10 UTCGHSA enrichment
  5. 2026-07-05 02:31 UTCEPSS rescore
  6. 2026-07-03 08:27 UTCEG score recompute
  7. 2026-07-03 08:26 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-9546?
CVE-2026-9546 is a high vulnerability published on July 3, 2026. A vulnerability in libcurl caused the HTTP Referer: header to persist even when explicitly cleared. While the documentation states that passing NULL to CURLOPT_REFERER suppresses the header, the option failed to clear the internal state. As a result the previous referrer string was erroneously…
When was CVE-2026-9546 disclosed?
CVE-2026-9546 was first published in the National Vulnerability Database on July 3, 2026, with the most recent update on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9546 actively exploited?
CVE-2026-9546 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-9546?
CVE-2026-9546 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 0.0.
How do I remediate CVE-2026-9546?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9546, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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