Vulnerability-Lookup

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

Vulnerability from cvelistv5 – Published: 2026-04-15 09:06 – Updated: 2026-04-15 19:35

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). PKIX draft CompositeVerifier accepts empty signature sequence as valid. This issue affects BC-JAVA: from 1.49 before 1.84.

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:Green

CWE

CWE-327 - Use of a Broken or Risky Cryptographic Algorithm

Assigner

bcorg

References

URL

Tags

https://github.com/bcgit/bc-java/wiki/CVE%E2%80%9…

Impacted products

	Vendor	Product	Version
	Legion of the Bouncy Castle Inc.	BC-JAVA	Affected: 1.67 , < 1.84 (maven)

Credits

Nicholas Carlini using Claude, Anthropic

Show details on NVD website

JSON

To clipboard

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GHSA-WG6Q-6289-32HP

Vulnerability from github – Published: 2026-04-15 18:31 – Updated: 2026-04-16 21:32

Summary

Bouncy Castle Crypto Package For Java: Use of a Broken or Risky Cryptographic Algorithm vulnerability in bcpkix modules

Details

: Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules).

PKIX draft CompositeVerifier accepts empty signature sequence as valid.

This issue affects BC-JAVA: from 1.49 before 1.84.

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:Green

Show details on source website

JSON

To clipboard

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      "package": {
        "ecosystem": "Maven",
        "name": "org.bouncycastle:bcpkix-jdk18on"
      },
      "ranges": [
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    "nvd_published_at": "2026-04-15T10:16:49Z",
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  "id": "GHSA-wg6q-6289-32hp",
  "modified": "2026-04-16T21:32:20Z",
  "published": "2026-04-15T18:31:54Z",
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}

FKIE_CVE-2026-5588

Vulnerability from fkie_nvd - Published: 2026-04-15 10:16 - Updated: 2026-04-17 15:38

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:Green

Summary

References

	URL	Tags
	91579145-5d7b-4cc5-b925-a0262ff19630	https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905588

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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}

Sightings

Author	Source	Type	Date

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.

Action not permitted

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

GHSA-WG6Q-6289-32HP

FKIE_CVE-2026-5588

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