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
Elevated
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.1Exploit: Elevated riskExposed services: Not assessed

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
8.1HIGHmedium confidence
EG Risk
52
EG Risk 52/100

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
Severity81% × 45%
Exploitation40% × 40%
Automatability0% × 15%
EPSS PROB
0.3%
EPSS %ILE
21st
KEV
Not listed

Published

July 3, 2026

Last Modified

September 15, 2026

Advisory Details (3)

Auto-updated Jul 6, 2026
Patch available.
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(20)

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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibcurl4t64 (8.18.0-1ubuntu2.2) @ resolute2026-09-23ubuntu
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 rangeFix by version rangeDependents
curl—
  • 7.30.0 up to 8.22.0-r0: fixed in 8.22.0-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
curl—
  • 7.30.0 up to 8.21.0-r0: fixed in 8.21.0-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
curl7.74.0-1.3 ... 8.9.1-2~bpo12+1 (219 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
curl7.88.1-10 ... 8.9.1-2~bpo12+1 (184 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
curl8.14.1-2 ... 8.23.0~rc2-1+exp1 (84 versions)
  • every version on: no fix on record
—
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.

Additional Vendor Advisories

(5)

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 6× in last 7d / 45× 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 305 total refreshes for this CVE.

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

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

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 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 0.3% probability of exploitation in the next 30 days (21st percentile of EPSS-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?
A fix for CVE-2026-8286 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-8286 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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