CVE-2026-59647

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-08-03. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 5.3Exploit: 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, CRMF/CMP password-MAC honours unbounded iteration count. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100CISA 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
Severity53% × 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
0.4%
EPSS %ILE
34th
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

August 28, 2026

Advisory Details (2)

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

commit c99d6427d681 (bcgit/bc-java)

Fix landed in bcgit/bc-java commit c99d6427d681 — awaiting tagged release

https://github.com/bcgit/bc-java/commit/c99d6427d6818d04165b07b45dfda96f2b384c53
generic

Home · bcgit/bc-java Wiki · GitHub

https://github.com/bcgit/bc-java/wiki/CVE-2026-59647

Vendor Advisories for CVE-2026-59647(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 15× in last 7d / 63× 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 162 total refreshes for this CVE.

  1. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-04 06:23 UTCEG score recompute
  3. 2026-10-04 06:23 UTCGHSA enrichment
  4. 2026-10-03 14:26 UTCEPSS rescore
  5. 2026-10-02 17:56 UTCEPSS rescore
  6. 2026-10-02 10:26 UTCEG score recompute
  7. 2026-10-02 10:26 UTCGHSA enrichment
  8. 2026-10-01 19:50 UTCEPSS rescore
  9. 2026-10-01 02:40 UTCEG score recompute
  10. 2026-10-01 02:40 UTCGHSA enrichment
  11. 2026-09-30 15:03 UTCEPSS rescore
  12. 2026-09-29 15:22 UTCEPSS rescore
  13. 2026-09-29 06:44 UTCEG score recompute
  14. 2026-09-29 06:44 UTCGHSA enrichment
  15. 2026-09-28 13:51 UTCEPSS rescore
  16. 2026-09-27 18:19 UTCEG score recompute
  17. 2026-09-27 18:19 UTCGHSA enrichment
  18. 2026-09-27 13:48 UTCEPSS rescore
  19. 2026-09-26 15:59 UTCEPSS rescore
  20. 2026-09-24 14:04 UTCEPSS rescore
  21. 2026-09-24 09:11 UTCEG score recompute
  22. 2026-09-24 09:11 UTCGHSA enrichment
  23. 2026-09-23 17:54 UTCEPSS rescore
  24. 2026-09-23 07:29 UTCEG score recompute
  25. 2026-09-23 07:29 UTCGHSA enrichment
Show 75 more
  1. 2026-09-22 05:47 UTCEG score recompute
  2. 2026-09-22 05:46 UTCGHSA enrichment
  3. 2026-09-20 20:58 UTCEG score recompute
  4. 2026-09-20 20:58 UTCGHSA enrichment
  5. 2026-09-20 20:16 UTCEPSS rescore
  6. 2026-09-19 13:37 UTCEG score recompute
  7. 2026-09-19 13:37 UTCGHSA enrichment
  8. 2026-09-18 19:28 UTCEPSS rescore
  9. 2026-09-18 08:45 UTCEG score recompute
  10. 2026-09-18 08:45 UTCGHSA enrichment
  11. 2026-09-17 19:31 UTCEPSS rescore
  12. 2026-09-17 07:03 UTCEG score recompute
  13. 2026-09-17 07:03 UTCGHSA enrichment
  14. 2026-09-16 14:08 UTCEPSS rescore
  15. 2026-09-16 05:20 UTCEG score recompute
  16. 2026-09-16 05:20 UTCGHSA enrichment
  17. 2026-09-16 05:15 UTCEPSS rescore
  18. 2026-09-15 03:11 UTCEPSS rescore
  19. 2026-09-15 02:05 UTCGHSA enrichment
  20. 2026-09-13 18:19 UTCEG score recompute
  21. 2026-09-13 18:19 UTCGHSA enrichment
  22. 2026-09-13 16:47 UTCEPSS rescore
  23. 2026-09-12 16:36 UTCEG score recompute
  24. 2026-09-12 16:36 UTCGHSA enrichment
  25. 2026-09-11 14:54 UTCEG score recompute
  26. 2026-09-11 14:54 UTCGHSA enrichment
  27. 2026-09-11 14:53 UTCEPSS rescore
  28. 2026-09-10 09:35 UTCEPSS rescore
  29. 2026-09-10 08:50 UTCGHSA enrichment
  30. 2026-09-09 06:51 UTCEG score recompute
  31. 2026-09-09 06:51 UTCGHSA enrichment
  32. 2026-09-08 22:01 UTCEPSS rescore
  33. 2026-09-07 19:05 UTCEG score recompute
  34. 2026-09-07 19:05 UTCGHSA enrichment
  35. 2026-09-07 16:01 UTCEPSS rescore
  36. 2026-09-06 13:47 UTCEPSS rescore
  37. 2026-09-06 06:32 UTCEG score recompute
  38. 2026-09-06 06:32 UTCGHSA enrichment
  39. 2026-09-05 04:32 UTCEG score recompute
  40. 2026-09-05 04:32 UTCGHSA enrichment
  41. 2026-09-04 05:07 UTCEPSS rescore
  42. 2026-09-03 17:56 UTCEG score recompute
  43. 2026-09-03 17:55 UTCGHSA enrichment
  44. 2026-09-02 14:12 UTCEPSS rescore
  45. 2026-09-02 07:56 UTCEG score recompute
  46. 2026-09-02 07:56 UTCGHSA enrichment
  47. 2026-09-01 13:54 UTCEPSS rescore
  48. 2026-09-01 04:40 UTCEPSS rescore
  49. 2026-09-01 02:54 UTCGHSA enrichment
  50. 2026-08-31 00:34 UTCEG score recompute
  51. 2026-08-31 00:34 UTCGHSA enrichment
  52. 2026-08-30 19:17 UTCEPSS rescore
  53. 2026-08-30 01:22 UTCEPSS rescore
  54. 2026-08-29 22:52 UTCEG score recompute
  55. 2026-08-29 22:51 UTCGHSA enrichment
  56. 2026-08-28 21:42 UTCEPSS rescore
  57. 2026-08-28 21:09 UTCEG score recompute▼ 1.60
  58. 2026-08-28 21:08 UTCGHSA enrichment
  59. 2026-08-28 19:57 UTCNVD updateCVSS v3 → 5.3
  60. 2026-08-28 04:50 UTCEG score recompute
  61. 2026-08-28 04:50 UTCGHSA enrichment
  62. 2026-08-27 14:25 UTCEPSS rescore
  63. 2026-08-27 03:07 UTCEG score recompute
  64. 2026-08-27 03:07 UTCGHSA enrichment
  65. 2026-08-26 14:46 UTCEPSS rescore
  66. 2026-08-26 01:22 UTCEG score recompute
  67. 2026-08-26 01:22 UTCGHSA enrichment
  68. 2026-08-25 13:49 UTCEPSS rescore
  69. 2026-08-24 23:40 UTCEG score recompute
  70. 2026-08-24 23:40 UTCGHSA enrichment
  71. 2026-08-23 21:58 UTCEG score recompute
  72. 2026-08-23 21:58 UTCGHSA enrichment
  73. 2026-08-23 00:19 UTCEPSS rescore
  74. 2026-08-22 20:16 UTCEG score recompute
  75. 2026-08-22 20:16 UTCGHSA enrichment

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-59647?
CVE-2026-59647 is a medium vulnerability published on August 3, 2026. In Bouncy Castle for Java before 1.85, CRMF/CMP password-MAC honours unbounded iteration count. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).
When was CVE-2026-59647 disclosed?
CVE-2026-59647 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-2026-59647 actively exploited?
CVE-2026-59647 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (34th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-59647?
CVE-2026-59647 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-59647?
An upstream fix for CVE-2026-59647 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-2026-59647 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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