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Python cryptography CVE-2026-26007

HIGH
Insufficient Verification of Data Authenticity (CWE-345)
2026-02-10 security-advisories@github.com GHSA-r6ph-v2qm-q3c2
Python Cryptography Information Disclosure
8.2
CVSS 4.0 · Vendor: github
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Severity by source

Vendor (github) PRIMARY
8.2 HIGH
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
vuln.today AI
5.3 MEDIUM

Network-reachable and unauthenticated (AV:N/PR:N) but high complexity (AC:H) since only uncommon SECT curves are affected and key recovery needs repeated interactions; impact is private-key disclosure (C:H) with no integrity/availability loss.

3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
4.0 AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Red Hat
7.4 HIGH
qualitative

Primary rating from Vendor (github).

CVSS VectorVendor: github

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
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

11
Analysis Updated
Jun 30, 2026 - 05:46 vuln.today
v5 (cvss_changed)
Source Code Evidence Fetched
Jun 30, 2026 - 05:45 vuln.today
Analysis Updated
Jun 30, 2026 - 05:45 vuln.today
v4 (cvss_changed)
Analysis Updated
Jun 30, 2026 - 05:44 vuln.today
v3 (cvss_changed)
Analysis Updated
Jun 30, 2026 - 05:44 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jun 30, 2026 - 03:23 vuln.today
cvss_changed
Severity Changed
Jun 30, 2026 - 03:23 NVD
MEDIUM HIGH
CVSS changed
Jun 30, 2026 - 03:23 NVD
6.5 (MEDIUM) 8.2 (HIGH)
Analysis Generated
Mar 12, 2026 - 22:02 vuln.today
Patch released
Feb 23, 2026 - 15:40 nvd
Patch available
CVE Published
Feb 10, 2026 - 22:17 nvd
MEDIUM 6.5

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 182 pypi packages depend on cryptography (91 direct, 91 indirect)

Ecosystem-wide dependent count for version 46.0.5.

DescriptionCVE.org

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.

AnalysisAI

Private-key information disclosure in the pyca/cryptography Python package (versions <= 46.0.4) arises because public-key loading and construction routines skip prime-order subgroup validation for SECT binary elliptic curves, letting an attacker submit a small-order point that leaks bits of a victim's private key during ECDH or enables signature forgery in ECDSA. Per the CVSS vector exploitation is unauthenticated and network-reachable (PR:N/AV:N) but high-complexity (AC:H), and only the rarely used SECT/binary curves are affected. There is no public exploit identified at time of analysis, EPSS risk is negligible (0.01%), and a fix is available in 46.0.5.

Technical ContextAI

cryptography exposes ECC primitives backed by OpenSSL through a Rust binding layer (src/rust/src/backend/ec.rs). The affected APIs - EllipticCurvePublicNumbers.public_key()/public_key_from_numbers, from_encoded_point(), load_der_public_key() and load_pem_public_key() - accepted an elliptic-curve point without confirming it lies in the curve's intended prime-order subgroup, the root-cause class captured by CWE-345 (Insufficient Verification of Data Authenticity). On curves with cofactor greater than 1 (the SECT binary-field curves SECT163K1/R2, SECT233K1/R1, SECT283K1/R1, SECT409K1/R1, SECT571K1/R1), an attacker-supplied small-order point P makes [d]P land in a tiny subgroup, so the result reveals d mod (small_subgroup_order) - classic invalid-curve/small-subgroup behaviour. The fix adds an ECPublicKey::new constructor that calls OpenSSL's check_key() whenever the cofactor is not 1, and additionally deprecates all SECT curves for removal. CPE confirms the affected component is cpe:2.3:a:cryptography.io:cryptography for the Python platform.

RemediationAI

Vendor-released patch: 46.0.5 - upgrade the cryptography package to 46.0.5 or later (for example, pin cryptography>=46.0.5 and rebuild/redeploy), which is the primary and complete fix per GHSA-r6ph-v2qm-q3c2 and commit 0eebb9dbb6343d9bc1d91e5a2482ed4e054a6d8c. On managed distributions, apply the corresponding vendor errata instead (Red Hat RHSA-2026:6308/6309/6404/2694/5665/6568/6497/6567/5168, SUSE-SU-2026:20655/20706). If you cannot upgrade immediately, the effective compensating control is to stop using SECT/binary elliptic curves entirely - the package deprecates them in 46.0.5 and will remove them in the next release - and to avoid loading or accepting externally supplied EC public keys over those curves in ECDH/ECDSA flows; the trade-off is that any system genuinely depending on SECT curves must migrate to prime-field curves (e.g., SECP256R1) before disabling them. Where you control the input path, validate or reject untrusted public keys against the expected prime-order subgroup before use.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
Image SL-Micro Image SL-Micro-Base-qcow Image SL-Micro-Default Image SL-Micro-Default-SelfInstall Image SL-Micro-Default-encrypted Image SL-Micro-Default-qcow Image SL-Micro-EC2 Image SLE-Micro Image SLE-Micro-Azure Image SLE-Micro-BYOS Image SLE-Micro-BYOS-Azure Image SLE-Micro-BYOS-EC2 Image SLE-Micro-BYOS-GCE Image SLE-Micro-EC2 Image SLE-Micro-GCE Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected
SUSE Linux Micro 6.0 Fixed
SUSE Linux Micro 6.1 Fixed
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed

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CVE-2026-26007 vulnerability details – vuln.today
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