CVE-2026-12803

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, KCCMBlockCipher MAC does not bind nonce when AAD is absent (cross-nonce AEAD forgery). 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
6%
KEV
Not listed

Published

August 3, 2026

Last Modified

September 2, 2026

Advisory Details (3)

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

commit 7d79aa76e984 (bcgit/bc-java)

Fix landed in bcgit/bc-java commit 7d79aa76e984 — awaiting tagged release

https://github.com/bcgit/bc-java/commit/7d79aa76e984da85f2a541cae8ba2ae56e1713bc
github_commit

commit 697794413ebf (bcgit/bc-java)

Fix landed in bcgit/bc-java commit 697794413ebf — awaiting tagged release

https://github.com/bcgit/bc-java/commit/697794413ebf7bc5e3fce609a707826ba52981af
generic

Home · bcgit/bc-java Wiki · GitHub

https://github.com/bcgit/bc-java/wiki/CVE-2026-12803

Vendor Advisories for CVE-2026-12803(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 23× 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 175 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-12803?
CVE-2026-12803 is a high vulnerability published on August 3, 2026. In Bouncy Castle for Java before 1.85, KCCMBlockCipher MAC does not bind nonce when AAD is absent (cross-nonce AEAD forgery). This issue also affects Bouncy Castle for Java LTS before 2.73.12.
When was CVE-2026-12803 disclosed?
CVE-2026-12803 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-2026-12803 actively exploited?
CVE-2026-12803 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 93.9% of all scored CVEs.
What is the CVSS score of CVE-2026-12803?
CVE-2026-12803 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-12803?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12803, 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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