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 mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.5Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

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
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.
EPSS PROB
0.2%
EPSS %ILE
6th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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 rangeFix by version rangeDependents
bouncycastle1.68-2 ... 1.80-3 (12 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
bouncycastle1.72-2 ... 1.86-1 (6 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
bouncycastle1.80-3, 1.86-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
bouncycastle1.80-3
  • every version up to 1.86-1: fixed in 1.86-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 85× 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 211 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

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 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 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-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?
An upstream fix for CVE-2026-12816 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-12816 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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