CVE-2026-54872 (GCVE-0-2026-54872)

Vulnerability from cvelistv5 – Published: 2026-09-29 15:32 – Updated: 2026-09-29 17:28
VLAI
Title
Timing Side-Channel in Scalar Multiplication for Non-NIST EC Curves
Summary
Issue summary: The generic elliptic-curve scalar multiplication used for ECDSA and SM2 signature operations with curves that do not have a dedicated implementation leaks information about the secret nonce through timing. Impact summary: An attacker able to measure signing times may learn information about the per-signature secret nonce, which over many signatures can, via a lattice / Hidden Number Problem attack, lead to recovery of the private key. CWE: CWE-208: Observable Timing Discrepancy Description: The generic elliptic-curve scalar multiplication used for curves that do not have a dedicated constant-time implementation pads the secret scalar with non-constant-time BIGNUM operations, so the time taken depends on the value of the secret scalar derived from the ECDSA and SM2 nonce. The leak is very small; observing it requires a large number of measurements. The effect is largest for curves whose group order lies on a machine-word boundary, such as brainpoolP384r1. Applications using ECDSA signing over the Brainpool and other generic prime curves, and SM2 signing on platforms that use the generic implementation, are vulnerable to this issue. The NIST curves P-256, P-384 and P-521 use dedicated constant-time implementations and are not affected. FIPS Impact: no The FIPS modules are not affected: the approved NIST curves used in the FIPS provider have dedicated constant-time implementations and do not use the affected code path.
Severity
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 17:27 UTC
CWE
  • CWE-208 - Observable Timing Discrepancy
Assigner
References
Impacted products
Vendor Product Version CPE status
OpenSSL OpenSSL Affected: 4.0.0 , < 4.0.3 (semver)
Affected: 3.6.0 , < 3.6.5 (semver)
Affected: 3.5.0 , < 3.5.9 (semver)
Affected: 3.4.0 , < 3.4.8 (semver)
Affected: 3.0.0 , < 3.0.23 (semver)
Affected: 1.1.1 , < 1.1.1zj (custom)
Affected: 1.0.2 , < 1.0.2zs (custom)
guessed Create a notification for this product.
Date Public
2026-09-29 14:21
Credits
Igor Ustinov
Show details on NVD website
To clipboard 

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                  "value": "Issue summary: The generic elliptic-curve scalar multiplication used for\u003cbr\u003eECDSA and SM2 signature operations with curves that do not have a dedicated\u003cbr\u003eimplementation leaks information about the secret nonce through timing.\u003cbr\u003e\u003cbr\u003eImpact summary: An attacker able to measure signing times may learn\u003cbr\u003einformation about the per-signature secret nonce, which over many signatures\u003cbr\u003ecan, via a lattice / Hidden Number Problem attack, lead to recovery of the\u003cbr\u003eprivate key.\u003cbr\u003e\u003cbr\u003eCWE: CWE-208: Observable Timing Discrepancy\u003cbr\u003e\u003cbr\u003eDescription: The generic elliptic-curve scalar multiplication used for\u003cbr\u003ecurves that do not have a dedicated constant-time implementation pads the\u003cbr\u003esecret scalar with non-constant-time BIGNUM operations, so the time taken\u003cbr\u003edepends on the value of the secret scalar derived from the ECDSA and SM2 nonce.\u003cbr\u003e\u003cbr\u003eThe leak is very small; observing it requires a large number of\u003cbr\u003emeasurements. The effect is largest for curves whose group order lies\u003cbr\u003eon a machine-word boundary, such as brainpoolP384r1.\u003cbr\u003e\u003cbr\u003eApplications using ECDSA signing over the Brainpool and other generic prime\u003cbr\u003ecurves, and SM2 signing on platforms that use the generic implementation,\u003cbr\u003eare vulnerable to this issue.\u003cbr\u003e\u003cbr\u003eThe NIST curves P-256, P-384 and P-521 use dedicated constant-time\u003cbr\u003eimplementations and are not affected.\u003cbr\u003e\u003cbr\u003eFIPS Impact: no\u003cbr\u003eThe FIPS modules are not affected: the approved NIST curves used in the FIPS\u003cbr\u003eprovider have dedicated constant-time implementations and do not use the\u003cbr\u003eaffected code path."
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            "orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
            "shortName": "openssl"
          },
          "references": [
            {
              "name": "OpenSSL Advisory",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://openssl-library.org/news/secadv/20260929.txt"
            },
            {
              "name": "4.0.3 git commit",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/openssl/openssl/commit/8166827a78aad164a07aa86dea2b425403ced471"
            },
            {
              "name": "3.6.5 git commit",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/openssl/openssl/commit/1a5bee8dc57430a2be69cd1ffe7fec6a62f4f179"
            },
            {
              "name": "3.5.9 git commit",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/openssl/openssl/commit/3f7e1363dccec6f7732bb9e9fa471bb6e4aa68cb"
            },
            {
              "name": "3.4.8 git commit",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/openssl/openssl/commit/7d83bc7764999dfd91b83b4f0815b45390422afd"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "Timing Side-Channel in Scalar Multiplication for Non-NIST EC Curves",
          "x_generator": {
            "engine": "Vulnogram 0.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
        "assignerShortName": "openssl",
        "cveId": "CVE-2026-54872",
        "datePublished": "2026-09-29T15:32:15.075Z",
        "dateReserved": "2026-06-16T10:18:08.635Z",
        "dateUpdated": "2026-09-29T17:28:12.657Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.