CVE-2026-54872

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Source
https://cve.org/CVERecord?id=CVE-2026-54872
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54872.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-54872
Downstream
Published
2026-09-29T15:32:15Z
Modified
2026-09-30T08:06:05Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Summary
Timing Side-Channel in Scalar Multiplication for Non-NIST EC Curves
Details

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.

Database specific 
{
    "cna_assigner":  "openssl",
    "cwe_ids":  [
        "CWE-208"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54872.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "introduced":  "4.0.0"
                },
                {
                    "fixed":  "4.0.3"
                },
                {
                    "introduced":  "3.6.0"
                },
                {
                    "fixed":  "3.6.5"
                },
                {
                    "introduced":  "3.5.0"
                },
                {
                    "fixed":  "3.5.9"
                },
                {
                    "introduced":  "3.4.0"
                },
                {
                    "fixed":  "3.4.8"
                },
                {
                    "introduced":  "3.0.0"
                },
                {
                    "fixed":  "3.0.23"
                }
            ],
            "source":  "AFFECTED_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/openssl/openssl

Affected ranges

Type
GIT
Repo
https://github.com/openssl/openssl
Events
Introduced
e04bd3433fd84e1861bf258ea37928d9845e6a86
Fixed
e04bd3433fd84e1861bf258ea37928d9845e6a86
Introduced
e818b74be2170fbe957a07b0da4401c2b694b3b8
Fixed
e818b74be2170fbe957a07b0da4401c2b694b3b8
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "1.1.1"
        },
        {
            "fixed":  "1.1.1zj"
        },
        {
            "introduced":  "1.0.2"
        },
        {
            "fixed":  "1.0.2zs"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54872.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "28170854778703993674264004058177114599",
                "73132526844288570625317440636111911761",
                "177405411499435185068645597737938634778",
                "224809958623850711330610094965797758930",
                "295554444428855106393106961197201359586"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-54872-c377fa22",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/openssl/openssl/commit/e04bd3433fd84e1861bf258ea37928d9845e6a86",
        "target":  {
            "file":  "include/openssl/opensslv.h"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "251633914150035957322733061977107206211",
                "338514574181828579838011565939158652696",
                "76638288692106140328510055542557597351",
                "142922657400765574308962710386922248045",
                "71649992455794854055653842592139575350",
                "65527166711110472566013424527579064967",
                "253196866009476977787139000804413898733",
                "172177136897997206866313011107384691461"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-54872-e051451f",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/openssl/openssl/commit/e818b74be2170fbe957a07b0da4401c2b694b3b8",
        "target":  {
            "file":  "crypto/opensslv.h"
        }
    }
]
vanir_signatures_modified 
"2026-09-30T08:06:05Z"