CVE-2026-8286

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-07-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — Patch released this weekElevated
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: Elevated riskExposed: 0

A fix is available — apply it.

A vulnerability exists where a new transfer that uses STARTTLS to upgrade the connection might reuse an existing live connection even though the TLS configuration mismatches so it should not.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
52(Track*)
EG Risk 52/100SSVC: Track*

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
Severity81% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

July 3, 2026

Last Modified

September 15, 2026

Advisory Details (3)

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

HackerOne

https://hackerone.com/reports/3718195
generic
https://curl.se/docs/CVE-2026-8286.json
generic

curl - wrong STARTTLS connection reuse - CVE-2026-8286

https://curl.se/docs/CVE-2026-8286.html

Vendor Advisories for CVE-2026-8286(16)

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

Patch Availability(16)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibcurl4-openssl-dev (7.68.0-1ubuntu2.25+esm4) @ focal2026-09-18ubuntu
redhatrhcos-4.22.9.8.202609081748-02026-09-15redhat
redhatrhui5/rhua-rhel9:17888805812026-09-09redhat
redhatcert-manager/cert-manager-istio-csr-rhel9:17883485942026-09-03redhat
redhatcert-manager/cert-manager-operator-rhel9:17883485222026-09-03redhat
redhatcert-manager/jetstack-cert-manager-rhel9:17883485712026-09-03redhat
redhatrhcos-4.22.9.8.202608251819-02026-09-01redhat
redhatdevspaces/code-rhel9:17877627932026-09-01redhat
redhatdiscovery/discovery-ui-rhel9:17882061962026-08-31redhat
redhatrhui5/rhua-tp-rhel9:17872412602026-08-24redhat
redhatcurl-0:7.61.1-34.el8_10.132026-08-20redhat
redhatpatch2026-08-19redhat
redhatcurl-0:7.76.1-40.el9_8.52026-08-17redhat
redhatcurl-0:8.12.1-4.el10_2.32026-08-17redhat
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

(6 across 6 ecosystems)
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
curl—8.22.0-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
curl—8.21.0-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
curl7.74.0-1.3 ... 8.9.1-2~bpo12+1 (219 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
curl7.88.1-10 ... 8.9.1-2~bpo12+1 (178 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
curl8.14.1-2 ... 8.22.0~rc3-1+exp1 (78 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
curl8.14.1-2 ... 8.21.0~rc1-1+exp1 (59 versions)8.21.0~rc2-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

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 / 87× 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 285 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-8286?
CVE-2026-8286 is a high vulnerability published on July 3, 2026. A vulnerability exists where a new transfer that uses STARTTLS to upgrade the connection might reuse an existing live connection even though the TLS configuration mismatches so it should not.
When was CVE-2026-8286 disclosed?
CVE-2026-8286 was first published in the National Vulnerability Database 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-2026-8286 actively exploited?
CVE-2026-8286 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 76.0% of all scored CVEs.
What is the CVSS score of CVE-2026-8286?
CVE-2026-8286 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-8286?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8286, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-8286

Explore →

Is Your Infrastructure Affected by CVE-2026-8286?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs