Timing side-channel in RSA PKCS#1 v1.5 decryption in ocrypto
Priority LOW 25CWE-208Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- Present
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-208.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00091 0th percentileScored 2026-11-07
Fix Fixed ocrypto (Oberon microsystems AG): 4.0.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Oberon microsystems AG | ocrypto | 3.0.0 to before 4.0.1 | 4.0.1 | Patch available | CNA |
- ocrypto VendorOberon microsystems AG Affected 3.0.0 to before 4.0.1 Fixed in 4.0.1 Patch available CNA
Remediation
- Fix · CNA ocrypto (Oberon microsystems AG) Fixed in 4.0.1
Timeline
- 2026-10-02 Threatist record created from CVE-2026-16458
- 2026-10-03 Alias added: GHSA-pfwq-9x97-jv4q
References
More Oberon microsystems AG vulnerabilities
- TI-2026-13753 Timing side-channel in RSA PKCS#1 v1.5 decryption in Oberon PSA Crypto CVSS 4.0MEDIUM 5.9
- TI-2025-06725 Timing side-channel vulnerability in AES-CBC decryption with PKCS#7 padding in Oberon PSA Crypto library CVSS 4.0MEDIUM 5.9
- TI-2025-06433 Timing side-channel vulnerability in AES-CBC decryption with PKCS#7 padding in ocrypto library CVSS 4.0MEDIUM 5.9
- TI-2025-08313 Insecure RSA-OAEP implementation with all-zero seed for padding in Oberon PSA Crypto CVSS 4.0LOW 2.3
Sources
- CVE-2026-16458 · CVE Program
- CVE-2026-16458 · NVD
- FIRST EPSS
- GHSA-pfwq-9x97-jv4q · GitHub Advisory Database · CC BY 4.0
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