cryptography Vulnerable to a Subgroup Attack Due to Missing Subgroup Validation for SECT Curves
Vulnerability Summary
The public_key_from_numbers (or EllipticCurvePublicNumbers.public_key()), EllipticCurvePublicNumbers.public_key(), load_der_public_key() and load_pem_public_key() functions do not verify that the point belongs to the expected prime-order subgroup of the curve.
This missing validation allows an attacker to provide a public key point P from a small-order subgroup. This can lead to security issues in various situations, such as the most commonly used signature verification (ECDSA) and shared key negotiation (ECDH). When the victim computes the shared secret as S = [victim_private_key]P via ECDH, this leaks information about victim_private_key mod (small_subgroup_order). For curves with cofactor > 1, this reveals the least significant bits of the private key. When these weak public keys are used in ECDSA , it's easy to forge signatures on the small subgroup.
Only SECT curves are impacted by this.
Credit
This vulnerability was discovered by:
- XlabAI Team of Tencent Xuanwu Lab
- Atuin Automated Vulnerability Discovery Engine
Betroffene Software
Klicken Sie auf eine Technologie, um alle zugehörigen Schwachstellen anzuzeigen.
| Plattform | Paket | Anfällige Versionen | Behoben in |
|---|---|---|---|
| Python (PyPI) | cryptography | < 46.0.5 | 46.0.5 |
Verweise
- https://access.redhat.com/security/cve/CVE-2026-26007
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26007.json
- http://www.openwall.com/lists/oss-security/2026/02/10/4
- https://access.redhat.com/errata/RHSA-2026:10184
- https://access.redhat.com/errata/RHSA-2026:12176
- https://access.redhat.com/errata/RHSA-2026:13512
- https://access.redhat.com/errata/RHSA-2026:13545
- https://access.redhat.com/errata/RHSA-2026:13553
- https://access.redhat.com/errata/RHSA-2026:13672
- https://access.redhat.com/errata/RHSA-2026:19355
- https://access.redhat.com/errata/RHSA-2026:21431
- https://access.redhat.com/errata/RHSA-2026:21517
- https://access.redhat.com/errata/RHSA-2026:22330
- https://access.redhat.com/errata/RHSA-2026:22993
- https://access.redhat.com/errata/RHSA-2026:2694
- https://access.redhat.com/errata/RHSA-2026:5168
- https://access.redhat.com/errata/RHSA-2026:5665
- https://access.redhat.com/errata/RHSA-2026:6308
- https://access.redhat.com/errata/RHSA-2026:6309
- https://access.redhat.com/errata/RHSA-2026:6497
- https://access.redhat.com/errata/RHSA-2026:6567
- https://access.redhat.com/errata/RHSA-2026:6568
- https://access.redhat.com/errata/RHSA-2026:7295
- https://github.com/pyca/cryptography/security/advisories/GHSA-r6ph-v2qm-q3c2
- https://bugzilla.redhat.com/show_bug.cgi?id=2438762
- https://github.com/pyca/cryptography/commit/0eebb9dbb6343d9bc1d91e5a2482ed4e054a6d8c
- https://nvd.nist.gov/vuln/detail/CVE-2026-26007
- https://github.com/pyca/cryptography
- https://github.com/pyca/cryptography/releases/tag/46.0.5
- CVSS-Vektor
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X- Schwäche (CWE)
CWE-345- Plattform
- Python (PyPI)
- Paket
cryptography- Veröffentlicht
- 10.02.2026
- Aktualisiert
- 11.10.2026 15:17
Quellen und Lizenzen
OSV / GitHub Advisory Database - PYSEC-2026-2141 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-r6ph-v2qm-q3c2 - CC BY 4.0
Schwachstellenhistorie: cryptography
Alle veröffentlichten Schwachstellen dieses Pakets (Python (PyPI)), neueste zuerst. Zeigt, ob es ein einmaliger Ausrutscher ist oder ein Paket, das man im Auge behalten muss.
- Einträge insgesamt
- 24
- Erste → letzte
- 03.2017 08.2026
- Ohne Fix
- 0
- In Angriffen ausgenutzt
- 0
Verteilung nach Schweregrad
- Hoch 12
- Mittel 7
- Niedrig 5
Veröffentlichungen pro Jahr
- 2017: 1
- 2018: 1
- 2019: 0
- 2020: 1
- 2021: 1
- 2022: 1
- 2023: 7
- 2024: 4
- 2025: 1
- 2026: 7
-
cryptography Vulnerable to a Subgroup Attack Due to Missing Subgroup Validation for SECT Curves dieser Eintrag
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