GHSA-r6ph-v2qm-q3c2 · 深刻度： high · エコシステム： pip — cryptography Vulnerable to a Subgroup Attack Due to Missing Subgroup Validation for SECT Curves
cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to 46.0.5, 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. This vulnerability is fixed in 46.0.5.
総合評価: CVE-2026-26007 は中リスク（42/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 0.34%、26 パーセンタイル） 推奨対応: 影響資産を整理し、修補計画に組み込んでください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-30 | 0.23% | 0.34% | +0.11% |
| 2 | 2026-06-15 | 0.01% | 0.23% | +0.22% |
| 3 | 2026-02-11 | — | 0.01% | — |
EPSS の全履歴 （全 3 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 8.2 | 4.0 | HIGH |
|
— | — | [email protected] |
| 6.5 | 3.1 | MEDIUM |
|
2.8 | 3.6 | [email protected] |
| 7.4 | 3.1 | HIGH |
|
2.2 | 5.2 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c |
GHSA-r6ph-v2qm-q3c2 · 深刻度： high · エコシステム： pip — cryptography Vulnerable to a Subgroup Attack Due to Missing Subgroup Validation for SECT Curves
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2026-26007: 1 source package rows (py3-cryptography); 19 state rows across 3 repos (3.23-main, edge-community, edge-main); fixed 2, open 17. | https://security.alpinelinux.org/vuln/CVE-2026-26007 |
debian
|
not yet assigned | CVE-2026-26007 not yet assigned priority: Debian including 1 source packages (python-cryptography), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. | https://security-tracker.debian.org/tracker/CVE-2026-26007 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2026-26007 |
suse
|
medium | CVE-2026-26007 severity moderate: SUSE including 242 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 302 product×package rows across 49 product lines (Image SL-Micro, Image SL-Micro-Base-VMware, … (49 product lines)): Known Affected 231, Known Not Affected 41, Fixed 29, First Fixed 1. | https://www.suse.com/security/cve/CVE-2026-26007/ |
ubuntu
|
medium | CVE-2026-26007 medium priority: Ubuntu including 1 source packages (python-cryptography), 8 status rows across 8 suites (bionic, focal, jammy, noble, questing, resolute, upstream, xenial): released 7, not-affected 1. | https://ubuntu.com/security/CVE-2026-26007 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| cryptography.io | cryptography | < 46.0.5 | cpe:2.3:a:cryptography.io:cryptography:*:*:*:*:*:python:*:* |