CVE-2026-59646

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, DTLS handshake reassembler allocates buffer from unchecked 24-bit length. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bctls-fips 1.0.24 (1.0.X series), 2.0.24 (2.0.X series) and 2.1.24 (2.1.X series).

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
29%
KEV
Not listed

Published

August 3, 2026

Last Modified

August 28, 2026

Advisory Details (3)

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

commit 2d98721e71bb (bcgit/bc-java)

Fix landed in bcgit/bc-java commit 2d98721e71bb — awaiting tagged release

https://github.com/bcgit/bc-java/commit/2d98721e71bbd822ffa0f84e088eea645cf679fa
github_commit

commit 2ea38942c791 (bcgit/bc-java)

Fix landed in bcgit/bc-java commit 2ea38942c791 — awaiting tagged release

https://github.com/bcgit/bc-java/commit/2ea38942c7917f6d7ab4de93d8a5336d021df0d9
generic

Home · bcgit/bc-java Wiki · GitHub

https://github.com/bcgit/bc-java/wiki/CVE-2026-59646

Vendor Advisories for CVE-2026-59646(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 26× in last 7d / 102× 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 179 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-59646?
CVE-2026-59646 is a high vulnerability published on August 3, 2026. In Bouncy Castle for Java before 1.85, DTLS handshake reassembler allocates buffer from unchecked 24-bit length. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bctls-fips 1.0.24 (1.0.X series), 2.0.24 (2.0.X series) and 2.1.24…
When was CVE-2026-59646 disclosed?
CVE-2026-59646 was first published in the National Vulnerability Database on August 3, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59646 actively exploited?
CVE-2026-59646 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 71.0% of all scored CVEs.
What is the CVSS score of CVE-2026-59646?
CVE-2026-59646 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-59646?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59646, 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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