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 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, 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
7.5HIGHmedium 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
9th
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 (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 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 / 86× 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 215 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 14:07 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 05:44 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 08:51 UTCGHSA enrichment
  2. 2026-09-23 21:24 UTCEG score recompute
  3. 2026-09-23 21:24 UTCGHSA enrichment
  4. 2026-09-23 13:47 UTCEPSS rescore
  5. 2026-09-23 08:55 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 05:43 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 01:12 UTCEG score recompute
  14. 2026-09-20 01:12 UTCGHSA enrichment
  15. 2026-09-19 13:36 UTCGHSA enrichment
  16. 2026-09-19 00:45 UTCEG score recompute
  17. 2026-09-19 00:45 UTCGHSA enrichment
  18. 2026-09-18 19:27 UTCEPSS rescore
  19. 2026-09-18 13:18 UTCGHSA enrichment
  20. 2026-09-18 01:13 UTCEG score recompute
  21. 2026-09-18 01:13 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 02:44 UTCGHSA enrichment
  30. 2026-09-14 14:42 UTCGHSA enrichment
  31. 2026-09-14 03:07 UTCEG score recompute
  32. 2026-09-14 03:07 UTCGHSA enrichment
  33. 2026-09-13 16:46 UTCEPSS rescore
  34. 2026-09-13 15:41 UTCGHSA enrichment
  35. 2026-09-13 04:14 UTCGHSA enrichment
  36. 2026-09-12 16:40 UTCEG score recompute
  37. 2026-09-12 16:40 UTCGHSA enrichment
  38. 2026-09-12 15:00 UTCEPSS rescore
  39. 2026-09-12 05:13 UTCGHSA enrichment
  40. 2026-09-11 17:46 UTCEG score recompute
  41. 2026-09-11 17:46 UTCGHSA enrichment
  42. 2026-09-11 14:52 UTCEPSS rescore
  43. 2026-09-11 09:36 UTCEPSS rescore
  44. 2026-09-11 06:12 UTCGHSA enrichment
  45. 2026-09-10 18:45 UTCEG score recompute
  46. 2026-09-10 18:45 UTCGHSA enrichment
  47. 2026-09-10 09:34 UTCEPSS rescore
  48. 2026-09-10 07:08 UTCGHSA enrichment
  49. 2026-09-09 19:41 UTCGHSA enrichment
  50. 2026-09-09 06:49 UTCEG score recompute
  51. 2026-09-09 06:49 UTCGHSA enrichment
  52. 2026-09-08 22:00 UTCEPSS rescore
  53. 2026-09-07 19:02 UTCEG score recompute
  54. 2026-09-07 19:02 UTCGHSA enrichment
  55. 2026-09-07 16:01 UTCEPSS rescore
  56. 2026-09-06 17:59 UTCEG score recompute
  57. 2026-09-06 17:59 UTCGHSA enrichment
  58. 2026-09-06 13:47 UTCEPSS rescore
  59. 2026-09-06 06:32 UTCGHSA enrichment
  60. 2026-09-05 18:41 UTCEG score recompute
  61. 2026-09-05 18:41 UTCGHSA enrichment
  62. 2026-09-05 04:30 UTCEG score recompute
  63. 2026-09-05 04:30 UTCGHSA enrichment
  64. 2026-09-04 10:18 UTCEG score recompute
  65. 2026-09-04 10:18 UTCGHSA enrichment
  66. 2026-09-04 05:06 UTCEPSS rescore
  67. 2026-09-03 20:45 UTCGHSA enrichment
  68. 2026-09-03 08:59 UTCEG score recompute
  69. 2026-09-03 08:59 UTCGHSA enrichment
  70. 2026-09-02 14:46 UTCEG score recompute▼ 1.20
  71. 2026-09-02 14:46 UTCGHSA enrichment
  72. 2026-09-02 14:43 UTCNVD updateCVSS v3 → 7.5
  73. 2026-09-02 14:11 UTCEPSS rescore
  74. 2026-09-01 22:21 UTCEG score recompute
  75. 2026-09-01 22:21 UTCGHSA enrichment

Related CVEs(same product + same CWE)

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 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 0.2% probability of exploitation in the next 30 days (9th percentile of EPSS-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?
An upstream fix for CVE-2026-12803 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-2026-12803 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-12803

Explore →

Is Your Infrastructure Affected by CVE-2026-12803?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs