Timing Attack Affecting openssl package, versions [1.1.1q,3.4.8)[3.5.0,3.5.9)[3.6.0,3.6.5)[4.0.1,4.0.3)
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-CONAN-OPENSSL-20536981
- published6 Oct 2026
- disclosed29 Sept 2026
- creditVladimir Tokarev
Introduced: 29 Sep 2026
NewCVE-2026-77696 (opens in a new tab)How to fix?
Upgrade openssl to version 3.4.8, 3.5.9, 3.6.5, 4.0.3 or higher.
Overview
Affected versions of this package are vulnerable to Timing Attack in SM2 signature generation, which performs variable time BIGNUM operations on both the secret nonce and the private key. An attacker can learn nonce information and recover the private key through a lattice or Hidden Number Problem attack, by measuring signing times across many signatures. This requires the ability to observe signing timings for a workload using SM2, and recovery needs many signatures rather than a single observation.