CVE-2026-16458 PUBLISHED

Timing side-channel in RSA PKCS#1 v1.5 decryption in ocrypto

Assigner: NCSC.ch
Reserved: 21.07.2026 Published: 13.08.2026 Updated: 13.08.2026

Padding oracle attack vulnerability in Oberon microsystem AG’s ocrypto library in all versions since 3.0.0 and prior to 4.0.1 allows an attacker to recover plaintexts via timing measurements of RSA PKCS#1 v1.5 decrypt operations.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS Score: 5.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Local	Confidentiality	High	Confidentiality	None
Attack Complexity	High	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Oberon microsystems AG
Product	ocrypto
Versions	Default: unaffected affected from 3.0.0 to 4.0.1 (excl.)

References

https://www.oberon.ch/security-advisories/cve-2026-16458/

Problem Types

CWE-208 Observable timing discrepancy CWE
CWE-327 CWE

Impacts

CAPEC-621 Analysis of Packet Timing and Sizes