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CVE-2026-5588 is an improper cryptographic-signature verification flaw in the PKIX draft CompositeVerifier implementation in Bouncy Castle bcpkix modules. CompositeVerifier accepts an empty signature sequence as valid rather than rejecting it. This affects BC-JAVA bcpkix versions from 1.67 before 1.80.2, version 1.81 before 1.81.1, and versions from 1.82 before 1.84; BCPKIX-FIPS versions from 2.0.6 before 2.0.11 and from 2.1.7 before 2.1.11; and BCPIX-LTS versions from 2.73.7 before 2.73.11.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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22 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Bouncy Castle PKIX vulnerability where CompositeVerifier incorrectly accepts an empty signature sequence as valid.
A Bouncy Castle PKIX vulnerability where CompositeVerifier incorrectly accepts an empty signature sequence as valid.
A signature validation flaw in bcpkix-fips where PKIX draft CompositeVerifier accepts an empty signature sequence as valid.
A Bouncy Castle PKIX draft CompositeVerifier vulnerability that accepts an empty signature sequence as valid.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.