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
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

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
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100

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%
EPSS PROB
0.7%
EPSS %ILE
49th
KEV
Not listed

Published

July 3, 2026

Last Modified

September 15, 2026

Advisory Details (3)

Auto-updated Jul 7, 2026
Patch available.
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(4)

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 / EcosystemFix (by version range) / 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

(3 across 3 ecosystems)
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
curl—
  • 8.18.0 up to 8.22.0-r0: fixed in 8.22.0-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
curl—
  • 8.18.0 up to 8.21.0-r0: fixed in 8.21.0-r0
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
curl8.14.1-2 ... 8.21.0~rc1-1+exp1 (59 versions)
  • every version up to 8.21.0~rc2-1: fixed in 8.21.0~rc2-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 54× 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 317 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

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 on July 3, 2026, with the most recent update on September 15, 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 0.7% probability of exploitation in the next 30 days (49th percentile of EPSS-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?
A fix for CVE-2026-9546 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-9546 are linked in the Vendor Advisories panel on this page.

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