Timing Attack Affecting openssl package, versions [1.0.2u,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-20537025
- published6 Oct 2026
- disclosed29 Sept 2026
- creditAlicja Kario, George Pantelakis,Youngjae Choi
Introduced: 29 Sep 2026
NewCVE-2026-54872 (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 the generic elliptic curve scalar multiplication used by ECDSA and SM2, which performs non constant time BIGNUM operations on a scalar derived from the secret nonce. 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 affects only curves without a dedicated implementation, with the leak strongest where the group order sits on a machine word boundary as in brainpoolP384r1, so the NIST curves and their constant time implementations are unaffected.