CVE-2026-9546

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

A fix is available — apply it.

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
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

July 3, 2026

Last Modified

July 7, 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(3)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrust-main-1.96.1-1.hum12026-07-02redhat
redhatcurl-main-8.21.0-0.1.hum12026-06-24redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(2 across 2 ecosystems)
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
curl—8.21.0-r0—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
curl8.14.1-2 ... 8.21.0~rc1-1+exp1 (59 versions)8.21.0~rc2-1—

Data Freshness Timeline

(refreshed 42× in last 7d / 162× 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.

Showing the most recent 100 of 219 total refreshes for this CVE.

  1. 2026-08-21 04:26 UTCEG score recompute
  2. 2026-08-21 04:26 UTCVendor advisory
  3. 2026-08-21 04:26 UTCGHSA enrichment
  4. 2026-08-20 22:56 UTCEPSS rescore
  5. 2026-08-20 15:52 UTCVendor advisory
  6. 2026-08-20 15:52 UTCGHSA enrichment
  7. 2026-08-20 03:56 UTCEG score recompute
  8. 2026-08-20 03:56 UTCVendor advisory
  9. 2026-08-20 03:56 UTCGHSA enrichment
  10. 2026-08-19 17:04 UTCEPSS rescore
  11. 2026-08-19 10:52 UTCVendor advisory
  12. 2026-08-19 10:52 UTCGHSA enrichment
  13. 2026-08-18 23:21 UTCEG score recompute
  14. 2026-08-18 23:21 UTCVendor advisory
  15. 2026-08-18 23:21 UTCGHSA enrichment
  16. 2026-08-18 13:49 UTCEPSS rescore
  17. 2026-08-18 11:46 UTCVendor advisory
  18. 2026-08-18 11:46 UTCGHSA enrichment
  19. 2026-08-17 22:49 UTCEG score recompute
  20. 2026-08-17 22:49 UTCVendor advisory
  21. 2026-08-17 22:49 UTCGHSA enrichment
  22. 2026-08-17 13:47 UTCEPSS rescore
  23. 2026-08-17 07:51 UTCVendor advisory
  24. 2026-08-17 07:51 UTCGHSA enrichment
  25. 2026-08-16 20:19 UTCEG score recompute
Show 75 more
  1. 2026-08-16 20:19 UTCVendor advisory
  2. 2026-08-16 20:19 UTCGHSA enrichment
  3. 2026-08-16 14:56 UTCEPSS rescore
  4. 2026-08-16 08:47 UTCEG score recompute
  5. 2026-08-16 08:47 UTCVendor advisory
  6. 2026-08-16 08:47 UTCGHSA enrichment
  7. 2026-08-16 02:15 UTCEPSS rescore
  8. 2026-08-15 21:16 UTCVendor advisory
  9. 2026-08-15 21:16 UTCGHSA enrichment
  10. 2026-08-15 09:44 UTCEG score recompute
  11. 2026-08-15 09:44 UTCVendor advisory
  12. 2026-08-15 09:44 UTCGHSA enrichment
  13. 2026-08-15 01:31 UTCEPSS rescore
  14. 2026-08-14 22:12 UTCVendor advisory
  15. 2026-08-14 22:12 UTCGHSA enrichment
  16. 2026-08-14 10:41 UTCVendor advisory
  17. 2026-08-14 10:41 UTCGHSA enrichment
  18. 2026-08-13 23:09 UTCEG score recompute
  19. 2026-08-13 23:09 UTCVendor advisory
  20. 2026-08-13 23:09 UTCGHSA enrichment
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-13 11:37 UTCVendor advisory
  23. 2026-08-13 11:37 UTCGHSA enrichment
  24. 2026-08-13 00:05 UTCEG score recompute
  25. 2026-08-13 00:05 UTCVendor advisory
  26. 2026-08-13 00:05 UTCGHSA enrichment
  27. 2026-08-12 13:51 UTCEPSS rescore
  28. 2026-08-12 12:34 UTCVendor advisory
  29. 2026-08-12 12:34 UTCGHSA enrichment
  30. 2026-08-12 01:02 UTCEG score recompute
  31. 2026-08-12 01:02 UTCVendor advisory
  32. 2026-08-12 01:02 UTCGHSA enrichment
  33. 2026-08-11 13:43 UTCEPSS rescore
  34. 2026-08-11 13:31 UTCVendor advisory
  35. 2026-08-11 13:31 UTCGHSA enrichment
  36. 2026-08-11 01:59 UTCEG score recompute
  37. 2026-08-11 01:59 UTCVendor advisory
  38. 2026-08-11 01:59 UTCGHSA enrichment
  39. 2026-08-11 00:00 UTCEPSS rescore
  40. 2026-08-10 14:28 UTCVendor advisory
  41. 2026-08-10 14:28 UTCGHSA enrichment
  42. 2026-08-10 02:57 UTCVendor advisory
  43. 2026-08-10 02:57 UTCGHSA enrichment
  44. 2026-08-09 15:25 UTCEG score recompute
  45. 2026-08-09 15:25 UTCVendor advisory
  46. 2026-08-09 15:25 UTCGHSA enrichment
  47. 2026-08-09 13:47 UTCEPSS rescore
  48. 2026-08-09 03:54 UTCEG score recompute
  49. 2026-08-09 03:54 UTCVendor advisory
  50. 2026-08-09 03:54 UTCGHSA enrichment
  51. 2026-08-08 16:37 UTCEPSS rescore
  52. 2026-08-08 16:23 UTCVendor advisory
  53. 2026-08-08 16:23 UTCGHSA enrichment
  54. 2026-08-08 04:51 UTCVendor advisory
  55. 2026-08-08 04:51 UTCGHSA enrichment
  56. 2026-08-07 17:20 UTCEG score recompute
  57. 2026-08-07 17:20 UTCVendor advisory
  58. 2026-08-07 17:20 UTCGHSA enrichment
  59. 2026-08-07 16:30 UTCEPSS rescore
  60. 2026-08-07 05:48 UTCVendor advisory
  61. 2026-08-07 05:48 UTCGHSA enrichment
  62. 2026-08-06 18:16 UTCEG score recompute
  63. 2026-08-06 18:16 UTCVendor advisory
  64. 2026-08-06 18:16 UTCGHSA enrichment
  65. 2026-08-06 13:47 UTCEPSS rescore
  66. 2026-08-06 06:45 UTCEG score recompute
  67. 2026-08-06 06:45 UTCVendor advisory
  68. 2026-08-06 06:45 UTCGHSA enrichment
  69. 2026-08-05 19:17 UTCEPSS rescore
  70. 2026-08-05 19:13 UTCVendor advisory
  71. 2026-08-05 19:13 UTCGHSA enrichment
  72. 2026-08-05 07:41 UTCVendor advisory
  73. 2026-08-05 07:41 UTCGHSA enrichment
  74. 2026-08-04 20:08 UTCEG score recompute
  75. 2026-08-04 20:08 UTCVendor advisory

Related CVEs(same vendor)

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 7, 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 0% probability of exploitation in the next 30 days, which ranks it in the top 66.7% of all scored CVEs.
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).
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.

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