SB2026052529 - Multiple vulnerabilities in Bouncy Castle for Java

Description

This security bulletin contains information about 4 vulnerabilities.

1) LDAP injection (CVE-ID: CVE-2026-0636)

CWE-ID: CWE-90 - Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to manipulate LDAP queries.

The vulnerability exists due to improper neutralization of special elements used in an LDAP query in LDAPStoreHelper when processing user-supplied input for LDAP queries. A remote attacker can supply crafted input to manipulate LDAP queries.

This issue is associated with the prov modules.

2) Use of a broken or risky cryptographic algorithm (CVE-ID: CVE-2026-5588)

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

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to bypass signature verification.

The vulnerability exists due to use of a broken or risky cryptographic algorithm in the PKIX draft CompositeVerifier when processing composite signatures. A remote attacker can provide an empty signature sequence to bypass signature verification.

3) Resource exhaustion (CVE-ID: CVE-2026-3505)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled resource consumption in the bcpg PGP AEAD processing when parsing crafted PGP data with an unbounded AEAD chunk size. A remote attacker can send specially crafted PGP data to cause a denial of service.

Exploitation leads to pre-authentication resource exhaustion.

4) Incorrect calculation (CVE-ID: CVE-2025-14813)

CWE-ID: CWE-682 - Incorrect Calculation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to cause cryptographic operations to fail.

The vulnerability exists due to improper implementation in G3413CTRBlockCipher when encrypting or decrypting more than 255 blocks. A remote attacker can supply data that exceeds this limit to cause cryptographic operations to fail.

The issue affects the GOST-R-3413-2015 CTR mode implementation because it uses a single-byte counter instead of a counter size aligned with the algorithm definition.

Remediation

Install update from vendor's website.

References

• https://github.com/advisories/GHSA-c3fc-8qff-9hwx
• https://github.com/advisories/GHSA-wg6q-6289-32hp
• https://github.com/advisories/GHSA-cj8j-37rh-8475
• https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902025%E2%80%9014813
• https://github.com/bcgit/bc-java/commit/b42574345414e4b7c8051b16fa1fafe01c29871f