CVE-2026-8927

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.1Exploit: NoneExposed: 0

A fix is available — apply it.

When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy authentication state between requests. Specifically, if the initial transfer authenticates against proxyA using Digest auth, a subsequent transfer routed through proxyB erroneously leaks the Proxy-Authorization: header intended solely for proxyA.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
—
EPSS
51.2%
KEV
Not listed

Published

July 3, 2026

Last Modified

July 7, 2026

Advisory Details (3)

Auto-updated Jul 6, 2026
No patch confirmed yet.
generic

HackerOne

https://hackerone.com/reports/3744543
generic
https://curl.se/docs/CVE-2026-8927.json
generic

curl - env-set cross-proxy Digest auth state leak - CVE-2026-8927

https://curl.se/docs/CVE-2026-8927.html

Vendor Advisories for CVE-2026-8927(4)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibcurl4-openssl-dev (7.68.0-1ubuntu2.25+esm4) @ focal2026-07-17ubuntu
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.

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 24× in last 7d / 137× 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 137 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-8927?
CVE-2026-8927 is a critical vulnerability published on July 3, 2026. When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy authentication state between requests. Specifically, if the initial transfer authenticates against proxyA using Digest auth, a subsequent transfer routed…
When was CVE-2026-8927 disclosed?
CVE-2026-8927 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-2026-8927 actively exploited?
CVE-2026-8927 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 51.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8927?
CVE-2026-8927 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-8927?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8927, 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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