CVE-2026-59640

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory (severity: HIGH) 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%CVSS: 5.3Exploit: 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, OpenPGP CFB quick-check oracle active on symmetric/session-key paths. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

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 6b94b1c146ce (bcgit/bc-java)

Fix landed in bcgit/bc-java commit 6b94b1c146ce — awaiting tagged release

https://github.com/bcgit/bc-java/commit/6b94b1c146cec1f565d9a85847fae511af77503e
generic

Home · bcgit/bc-java Wiki · GitHub

https://github.com/bcgit/bc-java/wiki/CVE-2026-59640

Vendor Advisories for CVE-2026-59640(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 18× in last 7d / 82× 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. 2026-09-19 03:52 UTCEG score recompute
  2. 2026-09-19 03:52 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 02:16 UTCEG score recompute
  5. 2026-09-18 02:16 UTCGHSA enrichment
  6. 2026-09-17 19:31 UTCEPSS rescore
  7. 2026-09-17 01:16 UTCEG score recompute
  8. 2026-09-17 01:16 UTCGHSA enrichment
  9. 2026-09-16 14:08 UTCEPSS rescore
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-15 17:09 UTCEG score recompute
  12. 2026-09-15 17:09 UTCGHSA enrichment
  13. 2026-09-15 03:11 UTCEPSS rescore
  14. 2026-09-14 11:54 UTCEG score recompute
  15. 2026-09-14 11:54 UTCGHSA enrichment
  16. 2026-09-13 16:47 UTCEPSS rescore
  17. 2026-09-13 10:54 UTCEG score recompute
  18. 2026-09-13 10:54 UTCGHSA enrichment
  19. 2026-09-12 09:53 UTCEG score recompute
  20. 2026-09-12 09:53 UTCGHSA enrichment
  21. 2026-09-11 14:53 UTCEPSS rescore
  22. 2026-09-11 08:52 UTCEG score recompute
  23. 2026-09-11 08:52 UTCGHSA enrichment
  24. 2026-09-10 09:35 UTCEPSS rescore
  25. 2026-09-10 07:52 UTCGHSA enrichment
Show 75 more
  1. 2026-09-09 06:51 UTCEG score recompute
  2. 2026-09-09 06:51 UTCGHSA enrichment
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-07 19:04 UTCEG score recompute
  5. 2026-09-07 19:04 UTCGHSA enrichment
  6. 2026-09-07 16:01 UTCEPSS rescore
  7. 2026-09-06 13:47 UTCEPSS rescore
  8. 2026-09-06 12:28 UTCEG score recompute
  9. 2026-09-06 12:27 UTCGHSA enrichment
  10. 2026-09-05 11:26 UTCEG score recompute
  11. 2026-09-05 11:26 UTCGHSA enrichment
  12. 2026-09-04 10:19 UTCEG score recompute
  13. 2026-09-04 10:18 UTCGHSA enrichment
  14. 2026-09-04 05:07 UTCEPSS rescore
  15. 2026-09-03 08:59 UTCEG score recompute
  16. 2026-09-03 08:59 UTCGHSA enrichment
  17. 2026-09-02 14:12 UTCEPSS rescore
  18. 2026-09-02 07:56 UTCEG score recompute
  19. 2026-09-02 07:56 UTCGHSA enrichment
  20. 2026-09-01 13:54 UTCEPSS rescore
  21. 2026-09-01 04:40 UTCEPSS rescore
  22. 2026-09-01 00:31 UTCGHSA enrichment
  23. 2026-08-30 23:09 UTCEG score recompute
  24. 2026-08-30 23:09 UTCGHSA enrichment
  25. 2026-08-30 19:17 UTCEPSS rescore
  26. 2026-08-30 01:22 UTCEPSS rescore
  27. 2026-08-29 22:08 UTCEG score recompute
  28. 2026-08-29 22:08 UTCGHSA enrichment
  29. 2026-08-28 21:42 UTCEPSS rescore
  30. 2026-08-28 15:58 UTCEG score recompute▼ 3.40
  31. 2026-08-28 15:58 UTCGHSA enrichment
  32. 2026-08-28 15:48 UTCNVD updateCVSS v3 → 5.3 · severity → MEDIUM
  33. 2026-08-28 01:31 UTCGHSA enrichment
  34. 2026-08-27 13:51 UTCGHSA enrichment
  35. 2026-08-27 02:10 UTCEG score recompute
  36. 2026-08-27 02:10 UTCGHSA enrichment
  37. 2026-08-26 14:46 UTCEPSS rescore
  38. 2026-08-26 14:30 UTCGHSA enrichment
  39. 2026-08-26 02:50 UTCGHSA enrichment
  40. 2026-08-25 15:09 UTCEG score recompute
  41. 2026-08-25 15:09 UTCGHSA enrichment
  42. 2026-08-25 13:49 UTCEPSS rescore
  43. 2026-08-25 03:24 UTCGHSA enrichment
  44. 2026-08-24 15:45 UTCEG score recompute
  45. 2026-08-24 15:45 UTCGHSA enrichment
  46. 2026-08-24 04:04 UTCGHSA enrichment
  47. 2026-08-23 16:24 UTCGHSA enrichment
  48. 2026-08-23 04:45 UTCEG score recompute
  49. 2026-08-23 04:45 UTCGHSA enrichment
  50. 2026-08-23 00:19 UTCEPSS rescore
  51. 2026-08-22 17:04 UTCGHSA enrichment
  52. 2026-08-22 05:21 UTCEG score recompute
  53. 2026-08-22 05:21 UTCGHSA enrichment
  54. 2026-08-21 23:49 UTCEPSS rescore
  55. 2026-08-21 17:41 UTCGHSA enrichment
  56. 2026-08-21 06:01 UTCEG score recompute
  57. 2026-08-21 06:01 UTCGHSA enrichment
  58. 2026-08-20 22:55 UTCEPSS rescore
  59. 2026-08-20 18:21 UTCGHSA enrichment
  60. 2026-08-20 06:41 UTCGHSA enrichment
  61. 2026-08-19 19:01 UTCEG score recompute
  62. 2026-08-19 19:01 UTCGHSA enrichment
  63. 2026-08-19 17:04 UTCEPSS rescore
  64. 2026-08-19 06:48 UTCGHSA enrichment
  65. 2026-08-18 18:58 UTCEG score recompute
  66. 2026-08-18 18:58 UTCGHSA enrichment
  67. 2026-08-18 13:48 UTCEPSS rescore
  68. 2026-08-18 07:17 UTCGHSA enrichment
  69. 2026-08-17 19:37 UTCEG score recompute
  70. 2026-08-17 19:37 UTCGHSA enrichment
  71. 2026-08-17 13:47 UTCEPSS rescore
  72. 2026-08-17 06:15 UTCGHSA enrichment
  73. 2026-08-16 18:36 UTCEG score recompute
  74. 2026-08-16 18:36 UTCGHSA enrichment
  75. 2026-08-16 14:56 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-59640?
CVE-2026-59640 is a medium vulnerability published on August 3, 2026. In Bouncy Castle for Java before 1.85, OpenPGP CFB quick-check oracle active on symmetric/session-key paths. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X…
When was CVE-2026-59640 disclosed?
CVE-2026-59640 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-2026-59640 actively exploited?
CVE-2026-59640 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 87.6% of all scored CVEs.
What is the CVSS score of CVE-2026-59640?
CVE-2026-59640 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-59640?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59640, 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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