CVE-2026-59639

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 93% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: 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, CMS verifySignatures returns true for SignedData with zero signers. 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
8.7
EG Score
8.7(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity87% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

August 3, 2026

Last Modified

August 4, 2026

Advisory Details (2)

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

commit 99ddc6dcc678 (bcgit/bc-java)

Fix landed in bcgit/bc-java commit 99ddc6dcc678 — awaiting tagged release

https://github.com/bcgit/bc-java/commit/99ddc6dcc6782e6a76b0dd587c77e62eb7096ad0
generic

Home · bcgit/bc-java Wiki · GitHub

https://github.com/bcgit/bc-java/wiki/CVE-2026-59639

Vendor Advisories for CVE-2026-59639(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 / 75× 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.

  1. 2026-08-20 08:10 UTCGHSA enrichment
  2. 2026-08-19 20:04 UTCEG score recompute
  3. 2026-08-19 20:04 UTCGHSA enrichment
  4. 2026-08-19 17:04 UTCEPSS rescore
  5. 2026-08-19 07:58 UTCGHSA enrichment
  6. 2026-08-18 19:52 UTCGHSA enrichment
  7. 2026-08-18 07:46 UTCGHSA enrichment
  8. 2026-08-17 19:37 UTCEG score recompute
  9. 2026-08-17 19:37 UTCGHSA enrichment
  10. 2026-08-17 13:47 UTCEPSS rescore
  11. 2026-08-17 05:46 UTCGHSA enrichment
  12. 2026-08-16 17:25 UTCEG score recompute
  13. 2026-08-16 17:25 UTCGHSA enrichment
  14. 2026-08-16 14:56 UTCEPSS rescore
  15. 2026-08-16 05:18 UTCEG score recompute
  16. 2026-08-16 05:18 UTCGHSA enrichment
  17. 2026-08-16 02:14 UTCEPSS rescore
  18. 2026-08-15 17:13 UTCGHSA enrichment
  19. 2026-08-15 05:07 UTCEG score recompute
  20. 2026-08-15 05:07 UTCGHSA enrichment
  21. 2026-08-15 01:30 UTCEPSS rescore
  22. 2026-08-14 17:00 UTCGHSA enrichment
  23. 2026-08-14 04:54 UTCEG score recompute
  24. 2026-08-14 04:54 UTCGHSA enrichment
  25. 2026-08-13 22:00 UTCEPSS rescore
Show 50 more
  1. 2026-08-13 16:48 UTCGHSA enrichment
  2. 2026-08-13 04:42 UTCGHSA enrichment
  3. 2026-08-12 16:36 UTCEG score recompute
  4. 2026-08-12 16:36 UTCGHSA enrichment
  5. 2026-08-12 13:51 UTCEPSS rescore
  6. 2026-08-12 04:29 UTCGHSA enrichment
  7. 2026-08-11 16:18 UTCEG score recompute
  8. 2026-08-11 16:18 UTCGHSA enrichment
  9. 2026-08-11 04:11 UTCEG score recompute
  10. 2026-08-11 04:11 UTCGHSA enrichment
  11. 2026-08-11 00:00 UTCEPSS rescore
  12. 2026-08-10 16:05 UTCGHSA enrichment
  13. 2026-08-10 03:59 UTCGHSA enrichment
  14. 2026-08-09 15:53 UTCEG score recompute
  15. 2026-08-09 15:53 UTCGHSA enrichment
  16. 2026-08-09 13:46 UTCEPSS rescore
  17. 2026-08-09 03:48 UTCEG score recompute
  18. 2026-08-09 03:48 UTCGHSA enrichment
  19. 2026-08-08 16:37 UTCEPSS rescore
  20. 2026-08-08 15:42 UTCGHSA enrichment
  21. 2026-08-08 03:36 UTCEG score recompute
  22. 2026-08-08 03:36 UTCGHSA enrichment
  23. 2026-08-07 15:30 UTCGHSA enrichment
  24. 2026-08-07 03:24 UTCGHSA enrichment
  25. 2026-08-06 15:18 UTCEG score recompute
  26. 2026-08-06 15:18 UTCGHSA enrichment
  27. 2026-08-06 13:47 UTCEPSS rescore
  28. 2026-08-06 03:12 UTCEG score recompute
  29. 2026-08-06 03:12 UTCGHSA enrichment
  30. 2026-08-05 19:17 UTCEPSS rescore
  31. 2026-08-05 15:06 UTCGHSA enrichment
  32. 2026-08-05 03:01 UTCEG score recompute
  33. 2026-08-05 03:00 UTCGHSA enrichment
  34. 2026-08-04 15:10 UTCEPSS rescore
  35. 2026-08-04 14:54 UTCGHSA enrichment
  36. 2026-08-04 14:45 UTCEG score recompute
  37. 2026-08-04 14:45 UTCGHSA enrichment
  38. 2026-08-04 10:39 UTCEPSS rescore
  39. 2026-08-04 02:39 UTCGHSA enrichment
  40. 2026-08-03 14:33 UTCEG score recompute
  41. 2026-08-03 14:33 UTCGHSA enrichment
  42. 2026-08-03 13:40 UTCEG score recompute
  43. 2026-08-03 13:40 UTCGHSA enrichment
  44. 2026-08-03 06:23 UTCEG score recompute
  45. 2026-08-03 06:23 UTCGHSA enrichment
  46. 2026-08-03 05:25 UTCEG score recompute
  47. 2026-08-03 05:25 UTCGHSA enrichment
  48. 2026-08-03 01:21 UTCEG score recompute
  49. 2026-08-03 01:04 UTCEG score recompute
  50. 2026-08-03 01:03 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-59639?
CVE-2026-59639 is a high vulnerability published on August 3, 2026. In Bouncy Castle for Java before 1.85, CMS verifySignatures returns true for SignedData with zero signers. 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…
When was CVE-2026-59639 disclosed?
CVE-2026-59639 was first published in the National Vulnerability Database on August 3, 2026, with the most recent update on August 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59639 actively exploited?
CVE-2026-59639 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 92.8% of all scored CVEs.
What is the CVSS score of CVE-2026-59639?
CVE-2026-59639 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-59639?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59639, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-59639

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