CVE-2026-16458

Plaintext recovery via distinguishable decryption errors

Published Aug 13, 2026 · Updated Aug 13, 2026

Timing side channel in Oberon microsystems AG ocrypto 3.0.0 through 4.0.0 allows local users to recover RSA plaintexts. RSA PKCS#1 v1.5 decryption error handling produces distinguishable timings for success, invalid padding, and oversized output states. Exploitation requires local timing measurements across repeated decryptions, and the documented consequence is plaintext recovery without integrity or availability impact.

CVSS severity5.9
Medium
EPSS probability0.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Timing side channel in Oberon microsystems AG ocrypto 3.0.0 through 4.0.0 allows local users to recover RSA plaintexts. RSA PKCS#1 v1.5 decryption error handling produces distinguishable timings for success, invalid padding, and oversized output states. Exploitation requires local timing measurements across repeated decryptions, and the documented consequence is plaintext recovery without integrity or availability impact.

The record

CVE
CVE-2026-16458
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Oberon microsystems AG
Product
ocrypto
Classifications
CWE-327, CWE-208
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.0.0 <4.0.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Oberon microsystems AG · ocryptoversion=3.0.0 <4.0.1

Published CVSS scores

5.9Switzerland Government Common Vulnerability ProgramCVSS: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 describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm
CWE-208Observable Timing Discrepancy

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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