Covert Timing Channel Affecting armmbed/mbedtls package, versions [0,]
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-ARMMBEDMBEDTLS-15924844
- published7 Apr 2026
- disclosed1 Apr 2026
- creditJing Liu, Zhiyuan Zhang, Lucía Martínez Gavier, Gilles Barthe, Marcel Böhme
Introduced: 1 Apr 2026
CVE-2025-66442 (opens in a new tab)How to fix?
There is no fixed version for armmbed/mbedtls.
Overview
Affected versions of this package are vulnerable to Covert Timing Channel via timing differences in RSA and CBC/ECB decryption operations when the LLVM compiler's select-optimize feature is enabled. An attacker can infer sensitive information, such as cryptographic keys, by analyzing the timing of cryptographic operations.