CVE-2026-16458 Oberon microsystems AG CVE debrief

Who should care

Organizations using ocrypto library versions 3.0.0 to 4.0.0 should prioritize updating to version 4.0.1 or later to mitigate this vulnerability. Operators of affected systems, security teams, and vulnerability management teams should review system configurations, assess potential exposure, and implement compensating controls if necessary.

Technical summary

The ocrypto library, used for cryptographic operations, is vulnerable to a padding oracle attack. This vulnerability, identified as CVE-2026-16458, allows an attacker to recover plaintexts via timing measurements of RSA PKCS#1 v1.5 decrypt operations. The vulnerability affects ocrypto library versions from 3.0.0 up to but not including 4.0.1. A fix is available in version 4.0.1 or later.

Defensive priority

Medium-priority defensive review recommended due to potential for timing-based attacks.

Recommended defensive actions

• Review and update ocrypto library to version 4.0.1 or later
• Implement compensating controls for timing-based attacks
• Monitor for potential exploitation attempts
• Review system configurations for potential exposure
• Verify system updates and patch management processes

Evidence notes

Evidence from official CVE and NVD sources indicates a padding oracle attack vulnerability in ocrypto library versions 3.0.0 to 4.0.0. Limited details on affected products and vendors; further review needed. The vulnerability allows an attacker to recover plaintexts via timing measurements of RSA PKCS#1 v1.5 decrypt operations. Affected systems may require updates to ocrypto library version 4.0.1 or later. Defenders should verify system configurations, review for potential exposure, and implement compensating controls if updates are not immediately feasible.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.