CVE-2026-12816

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-03. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
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%CVSS: 7.5Exploit: 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, IESEngine stream-mode MAC forgery via length-dependent KDF split. This issue also affects Bouncy Castle for Java LTS before 2.73.12.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

August 3, 2026

Last Modified

September 2, 2026

Advisory Details (2)

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

commit 6d9e4bbaee94 (bcgit/bc-java)

Fix landed in bcgit/bc-java commit 6d9e4bbaee94 — awaiting tagged release

https://github.com/bcgit/bc-java/commit/6d9e4bbaee9409713ada167e5f901554cbb084ac
generic

Home · bcgit/bc-java Wiki · GitHub

https://github.com/bcgit/bc-java/wiki/CVE-2026-12816

Vendor Advisories for CVE-2026-12816(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 22× in last 7d / 97× 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 171 total refreshes for this CVE.

  1. 2026-09-19 03:50 UTCEG score recompute
  2. 2026-09-19 03:50 UTCGHSA enrichment
  3. 2026-09-18 19:27 UTCEPSS rescore
  4. 2026-09-18 13:28 UTCGHSA enrichment
  5. 2026-09-18 01:12 UTCEG score recompute
  6. 2026-09-18 01:12 UTCGHSA enrichment
  7. 2026-09-17 01:16 UTCEG score recompute
  8. 2026-09-17 01:16 UTCGHSA enrichment
  9. 2026-09-16 05:20 UTCEG score recompute
  10. 2026-09-16 05:20 UTCGHSA enrichment
  11. 2026-09-16 05:14 UTCEPSS rescore
  12. 2026-09-15 17:09 UTCEG score recompute
  13. 2026-09-15 17:09 UTCGHSA enrichment
  14. 2026-09-15 02:02 UTCGHSA enrichment
  15. 2026-09-14 09:24 UTCGHSA enrichment
  16. 2026-09-13 21:14 UTCEG score recompute
  17. 2026-09-13 21:14 UTCGHSA enrichment
  18. 2026-09-13 16:46 UTCEPSS rescore
  19. 2026-09-13 09:03 UTCGHSA enrichment
  20. 2026-09-12 20:53 UTCEG score recompute
  21. 2026-09-12 20:53 UTCGHSA enrichment
  22. 2026-09-12 15:00 UTCEPSS rescore
  23. 2026-09-12 08:42 UTCGHSA enrichment
  24. 2026-09-11 20:31 UTCEG score recompute
  25. 2026-09-11 20:31 UTCGHSA enrichment
Show 75 more
  1. 2026-09-11 14:52 UTCEPSS rescore
  2. 2026-09-11 09:36 UTCEPSS rescore
  3. 2026-09-11 08:20 UTCGHSA enrichment
  4. 2026-09-10 20:09 UTCEG score recompute
  5. 2026-09-10 20:09 UTCGHSA enrichment
  6. 2026-09-10 09:34 UTCEPSS rescore
  7. 2026-09-10 07:51 UTCGHSA enrichment
  8. 2026-09-09 19:41 UTCGHSA enrichment
  9. 2026-09-09 06:49 UTCEG score recompute
  10. 2026-09-09 06:49 UTCGHSA enrichment
  11. 2026-09-08 22:00 UTCEPSS rescore
  12. 2026-09-07 19:02 UTCEG score recompute
  13. 2026-09-07 19:02 UTCGHSA enrichment
  14. 2026-09-07 16:01 UTCEPSS rescore
  15. 2026-09-06 19:03 UTCEG score recompute
  16. 2026-09-06 19:03 UTCGHSA enrichment
  17. 2026-09-06 13:47 UTCEPSS rescore
  18. 2026-09-06 06:51 UTCGHSA enrichment
  19. 2026-09-05 18:41 UTCEG score recompute
  20. 2026-09-05 18:41 UTCGHSA enrichment
  21. 2026-09-05 04:30 UTCEG score recompute
  22. 2026-09-05 04:30 UTCGHSA enrichment
  23. 2026-09-04 10:18 UTCEG score recompute
  24. 2026-09-04 10:18 UTCGHSA enrichment
  25. 2026-09-04 05:06 UTCEPSS rescore
  26. 2026-09-03 21:09 UTCGHSA enrichment
  27. 2026-09-03 08:59 UTCEG score recompute
  28. 2026-09-03 08:59 UTCGHSA enrichment
  29. 2026-09-02 14:46 UTCEG score recompute▼ 1.20
  30. 2026-09-02 14:46 UTCGHSA enrichment
  31. 2026-09-02 14:43 UTCNVD updateCVSS v3 → 7.5
  32. 2026-09-02 14:11 UTCEPSS rescore
  33. 2026-09-01 22:21 UTCEG score recompute
  34. 2026-09-01 22:21 UTCGHSA enrichment
  35. 2026-09-01 13:53 UTCEPSS rescore
  36. 2026-09-01 04:39 UTCEPSS rescore
  37. 2026-08-31 23:16 UTCGHSA enrichment
  38. 2026-08-30 22:35 UTCEG score recompute
  39. 2026-08-30 22:35 UTCGHSA enrichment
  40. 2026-08-30 19:17 UTCEPSS rescore
  41. 2026-08-30 10:25 UTCEG score recompute
  42. 2026-08-30 10:25 UTCGHSA enrichment
  43. 2026-08-30 01:21 UTCEPSS rescore
  44. 2026-08-29 22:06 UTCEG score recompute
  45. 2026-08-29 22:05 UTCGHSA enrichment
  46. 2026-08-28 21:40 UTCEPSS rescore
  47. 2026-08-28 00:56 UTCEG score recompute
  48. 2026-08-28 00:56 UTCGHSA enrichment
  49. 2026-08-27 14:24 UTCEPSS rescore
  50. 2026-08-27 12:14 UTCGHSA enrichment
  51. 2026-08-27 00:03 UTCEG score recompute
  52. 2026-08-27 00:03 UTCGHSA enrichment
  53. 2026-08-26 11:52 UTCGHSA enrichment
  54. 2026-08-25 23:39 UTCEG score recompute
  55. 2026-08-25 23:39 UTCGHSA enrichment
  56. 2026-08-25 13:48 UTCEPSS rescore
  57. 2026-08-25 11:28 UTCGHSA enrichment
  58. 2026-08-24 23:18 UTCEG score recompute
  59. 2026-08-24 23:18 UTCGHSA enrichment
  60. 2026-08-24 11:07 UTCEG score recompute
  61. 2026-08-24 11:07 UTCGHSA enrichment
  62. 2026-08-23 22:56 UTCGHSA enrichment
  63. 2026-08-23 10:46 UTCGHSA enrichment
  64. 2026-08-22 22:36 UTCGHSA enrichment
  65. 2026-08-22 10:26 UTCEG score recompute
  66. 2026-08-22 10:26 UTCGHSA enrichment
  67. 2026-08-21 23:48 UTCEPSS rescore
  68. 2026-08-21 22:16 UTCGHSA enrichment
  69. 2026-08-21 10:06 UTCEG score recompute
  70. 2026-08-21 10:06 UTCGHSA enrichment
  71. 2026-08-20 22:55 UTCEPSS rescore
  72. 2026-08-20 21:56 UTCGHSA enrichment
  73. 2026-08-20 09:46 UTCGHSA enrichment
  74. 2026-08-19 21:36 UTCEG score recompute
  75. 2026-08-19 21:36 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-12816?
CVE-2026-12816 is a high vulnerability published on August 3, 2026. In Bouncy Castle for Java before 1.85, IESEngine stream-mode MAC forgery via length-dependent KDF split. This issue also affects Bouncy Castle for Java LTS before 2.73.12.
When was CVE-2026-12816 disclosed?
CVE-2026-12816 was first published in the National Vulnerability Database on August 3, 2026, with the most recent update on September 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12816 actively exploited?
CVE-2026-12816 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 95.7% of all scored CVEs.
What is the CVSS score of CVE-2026-12816?
CVE-2026-12816 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-12816?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12816, 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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