CVE-2026-12817

HIGHNVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

Score 8.6 from GitHub Security Advisory (severity: HIGH) published 2026-08-03. NVD baseline CVSS 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.6Exploit: 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, OpenPGP AEAD decryption skips final tag on chunk-aligned data. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).

CVSS v3
8.6
EG Score
8.6(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity86% × 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

August 31, 2026

Advisory Details (2)

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

commit 4b712819846e (bcgit/bc-java)

Fix landed in bcgit/bc-java commit 4b712819846e — awaiting tagged release

https://github.com/bcgit/bc-java/commit/4b712819846ec944379f4909101abac20f0ad4b0
generic

Home · bcgit/bc-java Wiki · GitHub

https://github.com/bcgit/bc-java/wiki/CVE-2026-12817

Vendor Advisories for CVE-2026-12817(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 / 99× 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 173 total refreshes for this CVE.

  1. 2026-09-19 01:23 UTCEG score recompute
  2. 2026-09-19 01:23 UTCGHSA enrichment
  3. 2026-09-18 19:27 UTCEPSS rescore
  4. 2026-09-18 13:18 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 17:08 UTCGHSA enrichment
  14. 2026-09-15 02:02 UTCGHSA enrichment
  15. 2026-09-14 08:50 UTCGHSA enrichment
  16. 2026-09-13 20:45 UTCEG score recompute
  17. 2026-09-13 20:45 UTCGHSA enrichment
  18. 2026-09-13 16:46 UTCEPSS rescore
  19. 2026-09-13 08:40 UTCGHSA enrichment
  20. 2026-09-12 20:35 UTCEG score recompute
  21. 2026-09-12 20:35 UTCGHSA enrichment
  22. 2026-09-12 15:00 UTCEPSS rescore
  23. 2026-09-12 08:30 UTCGHSA enrichment
  24. 2026-09-11 20:24 UTCEG score recompute
  25. 2026-09-11 20:24 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 07:57 UTCGHSA enrichment
  4. 2026-09-10 19:52 UTCEG score recompute
  5. 2026-09-10 19:52 UTCGHSA enrichment
  6. 2026-09-10 09:34 UTCEPSS rescore
  7. 2026-09-10 07:47 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 18:51 UTCEG score recompute
  16. 2026-09-06 18:51 UTCGHSA enrichment
  17. 2026-09-06 13:47 UTCEPSS rescore
  18. 2026-09-06 06:46 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 14:11 UTCEPSS rescore
  30. 2026-09-01 22:21 UTCEG score recompute
  31. 2026-09-01 22:21 UTCGHSA enrichment
  32. 2026-09-01 13:53 UTCEPSS rescore
  33. 2026-09-01 07:23 UTCEG score recompute
  34. 2026-09-01 07:23 UTCGHSA enrichment
  35. 2026-09-01 04:39 UTCEPSS rescore
  36. 2026-08-31 15:39 UTCEG score recompute▼ 0.10
  37. 2026-08-31 15:39 UTCGHSA enrichment
  38. 2026-08-31 15:20 UTCNVD updateCVSS v3 → 8.6
  39. 2026-08-30 22:15 UTCEG score recompute
  40. 2026-08-30 22:15 UTCGHSA enrichment
  41. 2026-08-30 19:17 UTCEPSS rescore
  42. 2026-08-30 10:10 UTCEG score recompute
  43. 2026-08-30 10:10 UTCGHSA enrichment
  44. 2026-08-30 01:21 UTCEPSS rescore
  45. 2026-08-29 22:06 UTCEG score recompute
  46. 2026-08-29 22:05 UTCGHSA enrichment
  47. 2026-08-28 21:40 UTCEPSS rescore
  48. 2026-08-27 22:42 UTCEG score recompute
  49. 2026-08-27 22:42 UTCGHSA enrichment
  50. 2026-08-27 14:24 UTCEPSS rescore
  51. 2026-08-27 10:37 UTCGHSA enrichment
  52. 2026-08-26 22:33 UTCEG score recompute
  53. 2026-08-26 22:32 UTCGHSA enrichment
  54. 2026-08-26 10:27 UTCGHSA enrichment
  55. 2026-08-25 21:04 UTCEG score recompute
  56. 2026-08-25 21:04 UTCGHSA enrichment
  57. 2026-08-25 13:48 UTCEPSS rescore
  58. 2026-08-25 08:58 UTCGHSA enrichment
  59. 2026-08-24 20:54 UTCEG score recompute
  60. 2026-08-24 20:54 UTCGHSA enrichment
  61. 2026-08-24 08:48 UTCGHSA enrichment
  62. 2026-08-23 20:40 UTCGHSA enrichment
  63. 2026-08-23 08:35 UTCEG score recompute
  64. 2026-08-23 08:35 UTCGHSA enrichment
  65. 2026-08-23 00:19 UTCEPSS rescore
  66. 2026-08-22 20:30 UTCGHSA enrichment
  67. 2026-08-22 08:25 UTCEG score recompute
  68. 2026-08-22 08:25 UTCGHSA enrichment
  69. 2026-08-21 23:48 UTCEPSS rescore
  70. 2026-08-21 20:20 UTCGHSA enrichment
  71. 2026-08-21 08:15 UTCEG score recompute
  72. 2026-08-21 08:15 UTCGHSA enrichment
  73. 2026-08-20 22:55 UTCEPSS rescore
  74. 2026-08-20 20:10 UTCGHSA enrichment
  75. 2026-08-20 08:06 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-12817?
CVE-2026-12817 is a high vulnerability published on August 3, 2026. In Bouncy Castle for Java before 1.85, OpenPGP AEAD decryption skips final tag on chunk-aligned data. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).
When was CVE-2026-12817 disclosed?
CVE-2026-12817 was first published in the National Vulnerability Database on August 3, 2026, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12817 actively exploited?
CVE-2026-12817 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 96.3% of all scored CVEs.
What is the CVSS score of CVE-2026-12817?
CVE-2026-12817 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-12817?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12817, 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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