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
ALPINE (1)
AZL (9)
BELL (1)
CGA (8)
DEBIAN (1)
ECHO (1)
MGASA (1)
MINI (1)
openSUSE (1)
RHSA (2)
SUSE (6)
UBUNTU (1)
Related
openSUSE (1)
SUSE (6)
Published
2026-09-29T15:32:15Z
Modified
2026-10-20T17:39:39Z
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":  "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
e818b74be2170fbe957a07b0da4401c2b694b3b8
Fixed
e818b74be2170fbe957a07b0da4401c2b694b3b8
Introduced
e04bd3433fd84e1861bf258ea37928d9845e6a86
Fixed
e04bd3433fd84e1861bf258ea37928d9845e6a86
Introduced
98acb6b02839c609ef5b837794e08d906d965335
Fixed
e72c946f6f6d94c8ba5119acb25340b7b6b2073f
Introduced
636dfadc70ce26f2473870570bfd9ec352806b1d
Fixed
45e844fa2a14ec92d146bd8f5778ac130b6625fb
Introduced
7b371d80d959ec9ab4139d09d78e83c090de9779
Fixed
c8bd5a57108599ac650bbae77fcabe3109dab2e8
Introduced
11b7b6ea3b65a584e1d31408ed1bdb139465cffd
Fixed
af1775b60dfa141a4ad762585052cabeb9f37e9e
Fixed
1a5bee8dc57430a2be69cd1ffe7fec6a62f4f179
Fixed
3f7e1363dccec6f7732bb9e9fa471bb6e4aa68cb
Fixed
7d83bc7764999dfd91b83b4f0815b45390422afd
Fixed
8166827a78aad164a07aa86dea2b425403ced471
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "1.0.2"
                },
                {
                    "fixed":  "1.0.2zs"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "1.1.1"
                },
                {
                    "fixed":  "1.1.1zj"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "3.4.0"
                },
                {
                    "fixed":  "3.4.8"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "3.5.0"
                },
                {
                    "fixed":  "3.5.9"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "3.6.0"
                },
                {
                    "fixed":  "3.6.5"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "4.0.0"
                },
                {
                    "fixed":  "4.0.3"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "range":  [
                {
                    "fixed":  "1a5bee8dc57430a2be69cd1ffe7fec6a62f4f179"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "3f7e1363dccec6f7732bb9e9fa471bb6e4aa68cb"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "7d83bc7764999dfd91b83b4f0815b45390422afd"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "8166827a78aad164a07aa86dea2b425403ced471"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

3.*
3.4-POST-CLANG-FORMAT-WEBKIT
3.4-PRE-CLANG-FORMAT-WEBKIT
3.5-POST-CLANG-FORMAT-WEBKIT
3.5-PRE-CLANG-FORMAT-WEBKIT
3.6-POST-CLANG-FORMAT-WEBKIT
3.6-PRE-CLANG-FORMAT-WEBKIT
openssl-3.*
openssl-3.4.0
openssl-3.4.1
openssl-3.4.2
openssl-3.4.3
openssl-3.4.4
openssl-3.4.5
openssl-3.4.6
openssl-3.4.7
openssl-3.5.0
openssl-3.5.1
openssl-3.5.2
openssl-3.5.3
openssl-3.5.4
openssl-3.5.5
openssl-3.5.6
openssl-3.5.7
openssl-3.5.8
openssl-3.6.0
openssl-3.6.1
openssl-3.6.2
openssl-3.6.3
openssl-3.6.4
openssl-4.*
openssl-4.0.0
openssl-4.0.1
openssl-4.0.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54872.json"
vanir_signatures 
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vanir_signatures_modified 
"2026-10-20T17:39:39Z"