CVE-2026-26007
cryptography Subgroup Attack Due to Missing Subgroup Validation for SECT Curves
Description
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.
INFO
Published Date :
Feb. 10, 2026, 10:17 p.m.
Last Modified :
Feb. 23, 2026, 3:40 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update cryptography package to version 46.0.5 or later.
- Ensure public keys are validated against the prime-order subgroup.
- Verify signature verification and key negotiation processes.
- Monitor for any exploited weak public keys.
Public PoC/Exploit Available at Github
CVE-2026-26007 has a 6 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-26007.
| URL | Resource |
|---|---|
| https://github.com/pyca/cryptography/commit/0eebb9dbb6343d9bc1d91e5a2482ed4e054a6d8c | Patch |
| https://github.com/pyca/cryptography/security/advisories/GHSA-r6ph-v2qm-q3c2 | Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2026/02/10/4 | Mailing List Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-26007 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-26007
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-26007 vulnerability anywhere in the article.
-
Daily CyberSecurity
Apple Zero-Day (CVE-2026-20700) Exploited in the Wild
Apple has issued an emergency security update for its entire mobile ecosystem, racing to close a critical zero-day vulnerability that is currently being used in what the company describes as an “extre ... Read more
-
Daily CyberSecurity
CVE-2026-26007: Python Cryptography Flaw (CVSS 8.2) Leaks Private Keys
A high-severity vulnerability has been discovered in the cryptography Python package, one of the most widely used libraries for securing modern applications. The flaw, tracked as CVE-2026-26007, carri ... Read more
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Daily CyberSecurity
The Rise of Vibecoding: AI-Generated Malware Exploits React2Shell
A new class of cyberattack has been caught in the wild, one where the code isn’t written by a human hand, but generated entirely by artificial intelligence. Darktrace has released a report detailing a ... Read more
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Daily CyberSecurity
CVE-2026-25993: Critical EverShop SQL Injection (CVSS 9.3) Exposes Stores
A critical vulnerability has been discovered in EverShop, a modern, developer-focused e-commerce platform built on React and GraphQL. The flaw, tracked as CVE-2026-25993, is a “Second-Order SQL Inject ... Read more
The following table lists the changes that have been made to the
CVE-2026-26007 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 23, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Added CPE Configuration OR *cpe:2.3:a:cryptography.io:cryptography:*:*:*:*:*:python:*:* versions up to (excluding) 46.0.5 Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/02/10/4 Types: Mailing List, Third Party Advisory Added Reference Type GitHub, Inc.: https://github.com/pyca/cryptography/commit/0eebb9dbb6343d9bc1d91e5a2482ed4e054a6d8c Types: Patch Added Reference Type GitHub, Inc.: https://github.com/pyca/cryptography/security/advisories/GHSA-r6ph-v2qm-q3c2 Types: Vendor Advisory -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Feb. 11, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/02/10/4 -
New CVE Received by [email protected]
Feb. 10, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V4.0 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 Added CWE CWE-345 Added Reference https://github.com/pyca/cryptography/commit/0eebb9dbb6343d9bc1d91e5a2482ed4e054a6d8c Added Reference https://github.com/pyca/cryptography/security/advisories/GHSA-r6ph-v2qm-q3c2