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 19× in last 7d / 90× 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 221 total refreshes for this CVE.

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

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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