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: 0.3%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
5.3MEDIUMmedium 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: 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
0.3%
EPSS %ILE
26th
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 (2)

Auto-updated Aug 3, 2026
Patch available. 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 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 12× in last 7d / 64× 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 203 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

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 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 0.3% probability of exploitation in the next 30 days (26th percentile of EPSS-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?
A fix for CVE-2026-59640 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-59640 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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