CVE-2026-12817

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 95% 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
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: 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
8.7
EG Score
8.7(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
Severity87% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
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 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 25× in last 7d / 76× 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.

  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 20:10 UTCGHSA enrichment
  3. 2026-08-20 08:06 UTCGHSA enrichment
  4. 2026-08-19 20:01 UTCEG score recompute
  5. 2026-08-19 20:01 UTCGHSA enrichment
  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-19 07:56 UTCGHSA enrichment
  8. 2026-08-18 19:51 UTCEG score recompute
  9. 2026-08-18 19:51 UTCGHSA enrichment
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-18 07:46 UTCGHSA enrichment
  12. 2026-08-17 19:37 UTCEG score recompute
  13. 2026-08-17 19:37 UTCGHSA enrichment
  14. 2026-08-17 05:46 UTCGHSA enrichment
  15. 2026-08-16 17:13 UTCEG score recompute
  16. 2026-08-16 17:13 UTCGHSA enrichment
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 05:08 UTCEG score recompute
  19. 2026-08-16 05:08 UTCGHSA enrichment
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-15 17:03 UTCGHSA enrichment
  22. 2026-08-15 04:58 UTCEG score recompute
  23. 2026-08-15 04:58 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 16:52 UTCGHSA enrichment
Show 51 more
  1. 2026-08-14 04:46 UTCEG score recompute
  2. 2026-08-14 04:46 UTCGHSA enrichment
  3. 2026-08-13 22:00 UTCEPSS rescore
  4. 2026-08-13 16:41 UTCGHSA enrichment
  5. 2026-08-13 04:19 UTCGHSA enrichment
  6. 2026-08-12 16:14 UTCEG score recompute
  7. 2026-08-12 16:14 UTCGHSA enrichment
  8. 2026-08-12 13:50 UTCEPSS rescore
  9. 2026-08-12 04:10 UTCGHSA enrichment
  10. 2026-08-11 16:05 UTCEG score recompute
  11. 2026-08-11 16:04 UTCGHSA enrichment
  12. 2026-08-11 13:42 UTCEPSS rescore
  13. 2026-08-11 03:59 UTCEG score recompute
  14. 2026-08-11 03:59 UTCGHSA enrichment
  15. 2026-08-10 23:59 UTCEPSS rescore
  16. 2026-08-10 15:55 UTCGHSA enrichment
  17. 2026-08-10 03:46 UTCGHSA enrichment
  18. 2026-08-09 15:42 UTCGHSA enrichment
  19. 2026-08-09 03:37 UTCEG score recompute
  20. 2026-08-09 03:37 UTCGHSA enrichment
  21. 2026-08-08 16:37 UTCEPSS rescore
  22. 2026-08-08 15:33 UTCGHSA enrichment
  23. 2026-08-08 03:28 UTCEG score recompute
  24. 2026-08-08 03:28 UTCGHSA enrichment
  25. 2026-08-07 15:23 UTCGHSA enrichment
  26. 2026-08-07 03:18 UTCGHSA enrichment
  27. 2026-08-06 15:13 UTCEG score recompute
  28. 2026-08-06 15:13 UTCGHSA enrichment
  29. 2026-08-06 13:46 UTCEPSS rescore
  30. 2026-08-06 03:08 UTCEG score recompute
  31. 2026-08-06 03:08 UTCGHSA enrichment
  32. 2026-08-05 19:17 UTCEPSS rescore
  33. 2026-08-05 15:03 UTCGHSA enrichment
  34. 2026-08-05 02:58 UTCEG score recompute
  35. 2026-08-05 02:58 UTCGHSA enrichment
  36. 2026-08-04 15:09 UTCEPSS rescore
  37. 2026-08-04 14:54 UTCEG score recompute
  38. 2026-08-04 14:54 UTCGHSA enrichment
  39. 2026-08-04 10:38 UTCEPSS rescore
  40. 2026-08-04 04:41 UTCGHSA enrichment
  41. 2026-08-03 16:36 UTCEG score recompute
  42. 2026-08-03 16:36 UTCGHSA enrichment
  43. 2026-08-03 15:28 UTCEG score recompute
  44. 2026-08-03 15:28 UTCGHSA enrichment
  45. 2026-08-03 07:29 UTCEG score recompute
  46. 2026-08-03 07:29 UTCGHSA enrichment
  47. 2026-08-03 06:39 UTCEG score recompute
  48. 2026-08-03 06:38 UTCGHSA enrichment
  49. 2026-08-03 04:18 UTCEG score recompute
  50. 2026-08-03 04:04 UTCEG score recompute
  51. 2026-08-03 04:03 UTCMITRE cvelistV5first tracked

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 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12817 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 94.6% of all scored CVEs.
What is the CVSS score of CVE-2026-12817?
CVE-2026-12817 has a CVSS v3 base score of 8.7 (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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-12817

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