CVE-2026-5588

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 52% 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 — Patch released 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: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules), Legion of the Bouncy Castle Inc. BCPKIX-FIPS bcpkix on All (pkix modules), Legion of the Bouncy Castle Inc. BCPIX-LTS bcpkix on All (pkix modules).

This vulnerability is associated with program files JcaContentVerifierProviderBuilder.Java, JcaContentVerfierProviderBuilder.Java.

This issue affects BC-JAVA: from 1.67 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84; BCPKIX-FIPS: from 2.0.6 before 2.0.11, from 2.1.7 before 2.1.11; BCPIX-LTS: from 2.73.7 before 2.73.11.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
48%
KEV
Not listed

Published

April 15, 2026

Last Modified

August 27, 2026

Advisory Details (2)

Auto-updated May 8, 2026
No patch confirmed yet.
generic

CVE‐2026‐5588 · bcgit/bc-java Wiki · GitHub

https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905588
generic

ensured generic composite always checks at least one signature. Added… · bcgit/bc-java@656bae0 · GitHub

https://github.com/bcgit/bc-java/commit/656bae0dbd9b1521f840521ff786e78749fe3057

Vendor Advisories for CVE-2026-5588(20)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(16)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatocp-tools-4/jenkins-rhel9:17871250692026-08-26redhat
redhatocp-tools-4/jenkins-rhel9:17871251662026-08-26redhat
redhatocp-tools-4/jenkins-rhel8:17865335652026-08-26redhat
redhatocp-tools-4/jenkins-rhel9:17871247792026-08-26redhat
redhatocp-tools-4/jenkins-rhel8:17865335612026-08-26redhat
redhatocp-tools-4/jenkins-rhel8:17866286812026-08-26redhat
redhatocp-tools-4/jenkins-rhel9:17871246322026-08-26redhat
redhatocp-tools-4/jenkins-rhel9:17871246352026-08-26redhat
redhatocp-tools-4/jenkins-rhel9:17871249252026-08-26redhat
redhatocp-tools-4/jenkins-rhel9:17871253112026-08-26redhat
redhatocp-tools-4/jenkins-rhel8:17866286672026-08-26redhat
redhateap7-wildfly-0:7.4.25-2.GA_redhat_00001.1.el7eap2026-08-11redhat
redhatbcpkix-jdk18on2026-08-11redhat
redhatdevspaces/pluginregistry-rhel9:17793594232026-05-28redhat
redhateap8-bouncycastle-0:1.84.0-1.redhat_00001.1.el8eap2026-05-18redhat
redhateap8-yasson-0:3.0.4-5.redhat_00007.1.el9eap2026-05-18redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(11 across 5 ecosystems)
Maven(7)
PackageVulnerable rangeFixed inDependents
org.bouncycastle:bcpkix-debug-jdk141.81, 1.82, 1.831.84—
org.bouncycastle:bcpkix-debug-jdk15to181.73 ... 1.83 (12 versions)1.84—
org.bouncycastle:bcpkix-debug-jdk18on1.73 ... 1.83 (11 versions)1.84—
org.bouncycastle:bcpkix-jdk141.49 ... 1.83 (34 versions)1.84—
org.bouncycastle:bcpkix-jdk15on1.49 ... 1.70 (22 versions)1.84—
org.bouncycastle:bcpkix-jdk15to181.63 ... 1.83 (22 versions)1.84—
org.bouncycastle:bcpkix-jdk18on1.71 ... 1.83 (15 versions)1.84—
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(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 14× in last 7d / 65× 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 179 total refreshes for this CVE.

  1. 2026-08-30 19:17 UTCEPSS rescore
  2. 2026-08-30 01:22 UTCEPSS rescore
  3. 2026-08-28 21:42 UTCEPSS rescore
  4. 2026-08-27 14:25 UTCEPSS rescore
  5. 2026-08-27 13:36 UTCEG score recompute
  6. 2026-08-27 13:36 UTCVendor advisory
  7. 2026-08-27 13:02 UTCEG score recompute
  8. 2026-08-27 13:02 UTCVendor advisory
  9. 2026-08-26 16:12 UTCEG score recompute
  10. 2026-08-26 16:12 UTCVendor advisory
  11. 2026-08-26 14:46 UTCEPSS rescore
  12. 2026-08-26 12:23 UTCEG score recompute
  13. 2026-08-26 12:23 UTCVendor advisory
  14. 2026-08-25 13:49 UTCEPSS rescore
  15. 2026-08-23 00:19 UTCEPSS rescore
  16. 2026-08-21 23:49 UTCEPSS rescore
  17. 2026-08-20 22:55 UTCEPSS rescore
  18. 2026-08-19 17:04 UTCEPSS rescore
  19. 2026-08-18 13:48 UTCEPSS rescore
  20. 2026-08-17 13:47 UTCEPSS rescore
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-16 06:41 UTCEG score recompute
  23. 2026-08-16 06:41 UTCVendor advisory
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 15:53 UTCVendor advisory
Show 75 more
  1. 2026-08-14 04:46 UTCEG score recompute
  2. 2026-08-14 04:46 UTCVendor advisory
  3. 2026-08-13 22:00 UTCEPSS rescore
  4. 2026-08-13 10:53 UTCVendor advisory
  5. 2026-08-12 23:45 UTCEG score recompute
  6. 2026-08-12 23:45 UTCVendor advisory
  7. 2026-08-12 13:51 UTCEPSS rescore
  8. 2026-08-12 12:38 UTCEG score recompute
  9. 2026-08-12 12:38 UTCVendor advisory
  10. 2026-08-12 12:13 UTCEG score recompute
  11. 2026-08-12 12:13 UTCVendor advisory
  12. 2026-08-11 18:52 UTCEG score recompute
  13. 2026-08-11 18:52 UTCVendor advisory
  14. 2026-08-11 02:40 UTCEG score recompute
  15. 2026-08-11 02:40 UTCVendor advisory
  16. 2026-08-11 00:00 UTCEPSS rescore
  17. 2026-08-10 02:18 UTCVendor advisory
  18. 2026-08-09 15:11 UTCEG score recompute
  19. 2026-08-09 15:11 UTCVendor advisory
  20. 2026-08-09 13:46 UTCEPSS rescore
  21. 2026-08-09 04:03 UTCEG score recompute
  22. 2026-08-09 04:03 UTCVendor advisory
  23. 2026-08-08 16:37 UTCEPSS rescore
  24. 2026-08-08 11:47 UTCVendor advisory
  25. 2026-08-08 00:40 UTCEG score recompute
  26. 2026-08-08 00:40 UTCVendor advisory
  27. 2026-08-07 13:33 UTCEG score recompute
  28. 2026-08-07 13:33 UTCVendor advisory
  29. 2026-08-06 13:47 UTCEPSS rescore
  30. 2026-08-06 10:35 UTCVendor advisory
  31. 2026-08-05 23:25 UTCEG score recompute
  32. 2026-08-05 23:25 UTCVendor advisory
  33. 2026-08-05 19:17 UTCEPSS rescore
  34. 2026-08-04 15:10 UTCEPSS rescore
  35. 2026-08-04 10:39 UTCEPSS rescore
  36. 2026-08-03 21:37 UTCVendor advisory
  37. 2026-08-03 00:48 UTCVendor advisory
  38. 2026-08-02 13:17 UTCEG score recompute
  39. 2026-08-02 13:17 UTCVendor advisory
  40. 2026-08-02 02:27 UTCEPSS rescore
  41. 2026-08-01 04:16 UTCEPSS rescore
  42. 2026-07-30 16:28 UTCEPSS rescore
  43. 2026-07-30 01:30 UTCEPSS rescore
  44. 2026-07-30 01:30 UTCEPSS rescore
  45. 2026-07-28 15:37 UTCEPSS rescore
  46. 2026-07-27 14:14 UTCEPSS rescore
  47. 2026-07-26 14:54 UTCEPSS rescore
  48. 2026-07-26 14:54 UTCEPSS rescore
  49. 2026-07-25 14:18 UTCEPSS rescore
  50. 2026-07-25 14:18 UTCEPSS rescore
  51. 2026-07-24 14:18 UTCEPSS rescore
  52. 2026-07-24 14:18 UTCEPSS rescore
  53. 2026-07-23 14:18 UTCEPSS rescore
  54. 2026-07-23 14:18 UTCEPSS rescore
  55. 2026-07-23 03:20 UTCEG score recompute▲ 1.20
  56. 2026-07-22 14:08 UTCEPSS rescore
  57. 2026-07-22 14:08 UTCEPSS rescore
  58. 2026-07-21 15:25 UTCEPSS rescore
  59. 2026-07-21 15:25 UTCEPSS rescore
  60. 2026-07-20 17:08 UTCEPSS rescore
  61. 2026-07-20 10:04 UTCOSV refresh
  62. 2026-07-19 02:29 UTCEPSS rescore
  63. 2026-07-18 10:04 UTCEPSS rescore
  64. 2026-07-16 17:03 UTCEPSS rescore
  65. 2026-07-15 16:57 UTCEPSS rescore
  66. 2026-07-15 02:00 UTCEPSS rescore
  67. 2026-07-15 02:00 UTCEPSS rescore
  68. 2026-07-13 22:31 UTCEPSS rescore
  69. 2026-07-13 06:13 UTCEPSS rescore
  70. 2026-07-13 06:13 UTCEPSS rescore
  71. 2026-07-12 05:46 UTCEPSS rescore
  72. 2026-07-11 08:27 UTCEPSS rescore
  73. 2026-07-11 08:27 UTCEPSS rescore
  74. 2026-07-09 19:10 UTCEPSS rescore
  75. 2026-07-09 19:10 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-5588?
CVE-2026-5588 is a high vulnerability published on April 15, 2026. Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules), Legion of the Bouncy Castle Inc. BCPKIX-FIPS bcpkix on All (pkix modules), Legion of the Bouncy Castle Inc. BCPIX-LTS bcpkix on All (pkix modules). This…
When was CVE-2026-5588 disclosed?
CVE-2026-5588 was first published in the National Vulnerability Database on April 15, 2026, with the most recent update on August 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-5588 actively exploited?
CVE-2026-5588 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 51.8% of all scored CVEs.
What is the CVSS score of CVE-2026-5588?
CVE-2026-5588 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-5588?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-5588, 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-2026-5588

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