CVE-2026-5588
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk48th percentile - higher than 48% of all known CVEs
Summary
A broken or risky cryptographic algorithm vulnerability was found in Bouncy Castle libraries (BC-JAVA, BCPKIX-FIPS, BCPIX-LTS) in pkix modules. The issue affects files JcaContentVerifierProviderBuilder.Java and JcaContentVerfierProviderBuilder.Java.
Risk Assessment
An attacker could exploit the weak cryptographic algorithm to bypass digital signature verification mechanisms, potentially leading to data integrity compromise or impersonation of trusted sources.
Recommendation
Immediately update Bouncy Castle libraries to versions: BC-JAVA >= 1.80.2 (for 1.67), >= 1.81.1 (for 1.81), >= 1.84 (for 1.82); BCPKIX-FIPS >= 2.0.11 (for 2.0.6), >= 2.1.11 (for 2.1.7); BCPIX-LTS >= 2.73.11 (for 2.73.7).
Other vulnerabilities in Bouncy Castle
See all- CVE-2026-58062Critical
In Bouncy Castle for Java before 1.85, a Stapled OCSP response is accepted without binding to the checked certificate. This issue also affects LTS before 2.73.12 and FIPS before 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).
- CVE-2026-8763Critical
In Bouncy Castle for Java before 1.85, Name Constraints can be bypassed via a trailing dot in rfc822Name and URI. This issue also affects LTS before 2.73.12 and FIPS before appropriate versions.
- CVE-2026-59650Critical
In Bouncy Castle for Java before 1.85, the MTI/A0 Diffie-Hellman key agreement exponentiates an unvalidated peer value. This issue also affects LTS before 2.73.12.
- CVE-2026-14682High
In Bouncy Castle for Java before 1.85, a possible Out-of-Memory (OOM) condition exists due to unbounded up-front allocation on a definite-length read. This issue also affects LTS and FIPS versions.
- CVE-2026-13586High
In Bouncy Castle for Java before 1.85, the PKCS#12 MAC and bag-decryption KDF iteration-count bound can lead to DoS. This issue also affects LTS before 2.73.12 and BC-FJA before specific versions.
- CVE-2026-13506High
In Bouncy Castle for Java before 1.85, a Lazy ASN.1 sequence forces resetting the nesting-depth guard. This issue also affects LTS and FIPS versions.
- CVE-2026-12860Medium
In Bouncy Castle for Java before 1.85, RSA PKCS#1 signature verification skips the last two hash bytes in the NULL-omitted path. This issue also affects LTS before 2.73.12.
- CVE-2026-12852High
In Bouncy Castle for Java before 1.85, the MLS wire decoder allocates attacker-declared opaque length before bounds check.
- CVE-2026-12817High
In Bouncy Castle for Java before 1.85, OpenPGP AEAD decryption skips the final tag on chunk-aligned data. This issue also affects LTS and FIPS versions.
- CVE-2026-12816High
In Bouncy Castle for Java before 1.85, the IESEngine in stream mode allows MAC forgery via length-dependent KDF split. This issue also affects LTS before 2.73.12.
Original NVD description (English source)
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.