CVE-2026-5588 (GCVE-0-2026-5588)

Vulnerability from cvelistv5 – Published: 2026-04-15 09:06 – Updated: 2026-06-30 12:11
VLAI
Title
PKIX draft CompositeVerifier accepts empty signature sequence as valid.
Summary
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.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amber
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-327 - Use of a Broken or Risky Cryptographic Algorithm
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
Legion of the Bouncy Castle Inc. BC-JAVA Affected: 1.67 , < 1.80.2 (maven)
Affected: 1.81 , < 1.81.1 (maven)
Affected: 1.82 , < 1.84 (maven)
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Legion of the Bouncy Castle Inc. BCPKIX-FIPS Affected: 2.0.6 , < 2.0.11 (maven)
Affected: 2.1.7 , < 2.1.11 (maven)
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Legion of the Bouncy Castle Inc. BCPIX-LTS Affected: 2.73.7 , < 2.73.11 (maven)
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Red Hat Red Hat JBoss EAP 8.1 for RHEL 8     cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8
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Red Hat Red Hat JBoss EAP 8.1 for RHEL 9     cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
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Red Hat Red Hat AMQ Broker 7.12.7     cpe:/a:redhat:amq_broker:7.12
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Red Hat Red Hat AMQ Broker 7.13.5     cpe:/a:redhat:amq_broker:7.13
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Red Hat Red Hat Build of Apache Camel 4.14 for Quarkus 3.27     cpe:/a:redhat:apache_camel_quarkus:3.27
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Red Hat Red Hat JBoss Enterprise Application Platform 8.1     cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
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Red Hat Red Hat OpenShift Dev Spaces 3.28     cpe:/a:redhat:openshift_devspaces:3.28::el9
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Red Hat Red Hat build of Apache Camel 4.18.1 for Spring Boot 3.5.14     cpe:/a:redhat:apache_camel_spring_boot:4.18
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Red Hat Red Hat build of Quarkus 3.20.6.SP1     cpe:/a:redhat:quarkus:3.20::el8
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Red Hat Red Hat build of Quarkus 3.27.3.SP1     cpe:/a:redhat:quarkus:3.27::el8
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Red Hat OpenShift Developer Tools and Services     cpe:/a:redhat:ocp_tools
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Red Hat Red Hat build of Apache Camel 4 for Quarkus 3     cpe:/a:redhat:camel_quarkus:3
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Red Hat Red Hat build of Apicurio Registry 3     cpe:/a:redhat:apicurio_registry:3
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Red Hat Red Hat build of Debezium 3     cpe:/a:redhat:debezium:3
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Fuse 7     cpe:/a:redhat:jboss_fuse:7
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Red Hat Red Hat JBoss Enterprise Application Platform 7     cpe:/a:redhat:jboss_enterprise_application_platform:7
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat Red Hat Process Automation 7     cpe:/a:redhat:jboss_enterprise_bpms_platform:7
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Red Hat Red Hat Single Sign-On 7     cpe:/a:redhat:red_hat_single_sign_on:7
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Red Hat Cryostat 4     cpe:/a:redhat:cryostat:4
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Red Hat Red Hat AMQ Broker 7     cpe:/a:redhat:amq_broker:7
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Red Hat Red Hat Data Grid 8     cpe:/a:redhat:jboss_data_grid:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack     cpe:/a:redhat:jbosseapxp
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Red Hat Red Hat Satellite 6     cpe:/a:redhat:satellite:6
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Red Hat streams for Apache Kafka 2     cpe:/a:redhat:amq_streams:2
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Red Hat streams for Apache Kafka 3     cpe:/a:redhat:amq_streams:3
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Credits
Nicholas Carlini using Claude, Anthropic
Show details on NVD website
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      "cveMetadata": "{\"cveId\": \"CVE-2026-5588\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-30T12:11:15.811Z\", \"dateReserved\": \"2026-04-04T23:50:59.336Z\", \"assignerOrgId\": \"91579145-5d7b-4cc5-b925-a0262ff19630\", \"datePublished\": \"2026-04-15T09:06:15.617Z\", \"assignerShortName\": \"bcorg\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.