CVE-2026-5588

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7% (51st percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation0.7% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
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
0.7%
EPSS %ILE
51st
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

April 15, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated May 8, 2026
Patch available.
Web page

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

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

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(19)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatbcpkix-jdk18on2026-09-10redhat
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
redhatocp-tools-4/jenkins-rhel9:17871251662026-08-26redhat
redhatocp-tools-4/jenkins-rhel8:17865335652026-08-26redhat
redhatocp-tools-4/jenkins-rhel9:17871250692026-08-26redhat
redhateap7-wildfly-0:7.4.25-2.GA_redhat_00001.1.el8eap2026-08-11redhat
redhateap7-wildfly-0:7.4.25-2.GA_redhat_00001.1.el7eap2026-08-11redhat
redhateap7-wildfly-0:7.4.25-2.GA_redhat_00001.1.el9eap2026-08-11redhat
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
redhatorg.bouncycastle/bcpkix-jdk18on:1.84.0.redhat-000012026-05-18redhat

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 rangeFix by version rangeDependents
org.bouncycastle:bcpkix-debug-jdk141.81, 1.82, 1.83
  • 1.49 up to 1.84: fixed in 1.84
—
org.bouncycastle:bcpkix-debug-jdk15to181.73 ... 1.83 (12 versions)
  • 1.49 up to 1.84: fixed in 1.84
—
org.bouncycastle:bcpkix-debug-jdk18on1.73 ... 1.83 (11 versions)
  • 1.49 up to 1.84: fixed in 1.84
—
org.bouncycastle:bcpkix-jdk141.49 ... 1.83 (34 versions)
  • 1.49 up to 1.84: fixed in 1.84
—
org.bouncycastle:bcpkix-jdk15on1.49 ... 1.70 (22 versions)
  • 1.49 up to 1.84: fixed in 1.84
—
org.bouncycastle:bcpkix-jdk15to181.63 ... 1.83 (22 versions)
  • 1.49 up to 1.84: fixed in 1.84
—
org.bouncycastle:bcpkix-jdk18on1.71 ... 1.83 (17 versions)
  • 1.49 up to 1.84: fixed in 1.84
—
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(2)

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

Additional Vendor Advisories

(11)

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 11× in last 7d / 34× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 244 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 144 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  2. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  3. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  5. 2026-10-12 15:55 UTCEG score recompute
  6. 2026-10-11 19:38 UTCEG score recompute
  7. 2026-10-11 16:53 UTCEG score recompute
  8. 2026-10-11 14:16 UTCEG score recompute
  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  13. 2026-10-08 07:35 UTCOSV refresh
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  15. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  16. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  17. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  18. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  19. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  20. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  21. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  22. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  23. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  24. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  25. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.8% · 54th percentile
Show 75 more
  1. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  2. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  3. 2026-09-18 13:24 UTCEG score recompute
  4. 2026-09-18 13:24 UTCVendor advisory
  5. 2026-09-18 12:20 UTCEG score recompute
  6. 2026-09-18 12:20 UTCVendor advisory
  7. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  8. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  9. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  10. 2026-09-15 12:14 UTCEG score recompute
  11. 2026-09-15 12:14 UTCVendor advisory
  12. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  13. 2026-09-14 12:35 UTCEG score recompute
  14. 2026-09-14 12:35 UTCVendor advisory
  15. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  16. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  17. 2026-09-11 13:25 UTCEG score recompute
  18. 2026-09-11 13:25 UTCVendor advisory
  19. 2026-09-11 12:21 UTCEG score recompute
  20. 2026-09-11 12:21 UTCVendor advisory
  21. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  22. 2026-09-09 13:41 UTCEG score recompute
  23. 2026-09-09 13:41 UTCVendor advisory
  24. 2026-09-09 12:40 UTCEG score recompute
  25. 2026-09-09 12:40 UTCVendor advisory
  26. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  27. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  28. 2026-09-07 14:00 UTCEG score recompute
  29. 2026-09-07 14:00 UTCVendor advisory
  30. 2026-09-07 13:14 UTCEG score recompute
  31. 2026-09-07 13:14 UTCVendor advisory
  32. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  33. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  34. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  35. 2026-09-02 13:43 UTCEG score recompute
  36. 2026-09-02 13:43 UTCVendor advisory
  37. 2026-09-02 12:39 UTCEG score recompute
  38. 2026-09-02 12:39 UTCVendor advisory
  39. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  40. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  41. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  42. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  43. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  44. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  45. 2026-08-27 13:36 UTCEG score recompute
  46. 2026-08-27 13:36 UTCVendor advisory
  47. 2026-08-27 13:02 UTCEG score recompute
  48. 2026-08-27 13:02 UTCVendor advisory
  49. 2026-08-26 16:12 UTCEG score recompute
  50. 2026-08-26 16:12 UTCVendor advisory
  51. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  52. 2026-08-26 12:23 UTCEG score recompute
  53. 2026-08-26 12:23 UTCVendor advisory
  54. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  55. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  56. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  57. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  58. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  59. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  60. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  61. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  62. 2026-08-16 06:41 UTCEG score recompute
  63. 2026-08-16 06:41 UTCVendor advisory
  64. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  65. 2026-08-14 15:53 UTCVendor advisory
  66. 2026-08-14 04:46 UTCEG score recompute
  67. 2026-08-14 04:46 UTCVendor advisory
  68. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  69. 2026-08-13 10:53 UTCVendor advisory
  70. 2026-08-12 23:45 UTCEG score recompute
  71. 2026-08-12 23:45 UTCVendor advisory
  72. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  73. 2026-08-12 12:38 UTCEG score recompute
  74. 2026-08-12 12:38 UTCVendor advisory
  75. 2026-08-12 12:13 UTCEG score recompute

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-5588?
CVE-2026-5588 is a high-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-5588 published?
The CVE record for CVE-2026-5588 was published on April 15, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 18, 2026; the record at its source may have been updated since.
Is CVE-2026-5588 actively exploited?
CVE-2026-5588 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (51st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-5588?
CVE-2026-5588 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-5588?
A fix for CVE-2026-5588 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-5588 are linked in the Vendor Advisories panel on this page.

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