CVE-2026-8763

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 74% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In Bouncy Castle for Java before 1.85, Name Constraints bypass via trailing dot in rfc822Name and URI. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).

CVSS v3
9.3
EG Score
9.3(medium)
EG Risk
57(Track)
EG Risk 57/100SSVC: 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
Severity93% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

August 3, 2026

Last Modified

August 4, 2026

Advisory Details (2)

Auto-updated Aug 3, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
github_commit

commit 2c28b253a446 (bcgit/bc-java)

Fix landed in bcgit/bc-java commit 2c28b253a446 — awaiting tagged release

https://github.com/bcgit/bc-java/commit/2c28b253a44681fbbc562561eab6ad383d2ae558
generic

Home · bcgit/bc-java Wiki · GitHub

https://github.com/bcgit/bc-java/wiki/CVE-2026-8763

Vendor Advisories for CVE-2026-8763(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
bouncycastle1.68-2 ... 1.80-3 (12 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
bouncycastle1.72-2, 1.77-1, 1.80-1, 1.80-2, 1.80-3——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
bouncycastle1.80-3——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
bouncycastle1.80-3——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 60× in last 7d / 163× 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 163 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-8763?
CVE-2026-8763 is a critical vulnerability published on August 3, 2026. In Bouncy Castle for Java before 1.85, Name Constraints bypass via trailing dot in rfc822Name and URI. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).
When was CVE-2026-8763 disclosed?
CVE-2026-8763 was first published in the National Vulnerability Database on August 3, 2026, with the most recent update on August 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8763 actively exploited?
CVE-2026-8763 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 73.9% of all scored CVEs.
What is the CVSS score of CVE-2026-8763?
CVE-2026-8763 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-8763?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8763, 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

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