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: 0.6%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
7.5HIGHmedium 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%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
47th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

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

August 28, 2026

Advisory Details (3)

Auto-updated Aug 3, 2026
Patch available. 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 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 20× in last 7d / 89× 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 222 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

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 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 0.6% probability of exploitation in the next 30 days (47th percentile of EPSS-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?
A fix for CVE-2026-59646 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-59646 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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