CVE-2026-26007 (GCVE-0-2026-26007)

Vulnerability from cvelistv5 – Published: 2026-02-10 21:42 – Updated: 2026-06-30 12:08
VLAI
Title
cryptography Subgroup Attack Due to Missing Subgroup Validation for SECT Curves
Summary
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.
Severity
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
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-345 - Insufficient Verification of Data Authenticity
  • CWE-354 - Improper Validation of Integrity Check Value
Assigner
References
URL Tags
https://github.com/pyca/cryptography/security/adv… x_refsource_CONFIRM
https://github.com/pyca/cryptography/commit/0eebb… x_refsource_MISC
http://www.openwall.com/lists/oss-security/2026/02/10/4
https://access.redhat.com/security/cve/CVE-2026-26007 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2438762 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:13512 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:12176 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22330 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21517 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21431 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13672 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19355 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6308 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13553 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13545 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6309 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:2694 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7295 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:10184 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6568 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6497 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6567 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:5665 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:5168 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22993 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
pyca cryptography Affected: < 46.0.5
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Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 8     cpe:/a:redhat:ansible_automation_platform:2.5::el8
    cpe:/a:redhat:ansible_automation_platform_developer:2.5::el8
    cpe:/a:redhat:ansible_automation_platform_inside:2.5::el8
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Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 9     cpe:/a:redhat:ansible_automation_platform:2.5::el9
    cpe:/a:redhat:ansible_automation_platform_developer:2.5::el9
    cpe:/a:redhat:ansible_automation_platform_inside:2.5::el9
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Red Hat Red Hat Enterprise Linux AppStream (v. 8)     cpe:/a:redhat:enterprise_linux:8::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream (v. 9)     cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Red Hat Enterprise Linux HighAvailability (v. 8)     cpe:/a:redhat:enterprise_linux:8::highavailability
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Red Hat Red Hat Enterprise Linux High Availability E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::highavailability
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Red Hat Red Hat Enterprise Linux High Availability EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::highavailability
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Red Hat Red Hat Ansible Automation Platform 2.5     cpe:/a:redhat:ansible_automation_platform:2.5::el8
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Red Hat Red Hat Ansible Automation Platform 2.6     cpe:/a:redhat:ansible_automation_platform:2.6::el9
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Red Hat Red Hat Discovery 2     cpe:/a:redhat:discovery:2::el9
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Red Hat Red Hat Hardened Images     cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat OpenShift AI 2.25     cpe:/a:redhat:openshift_ai:2.25::el9
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Red Hat Red Hat Quay 3.15     cpe:/a:redhat:quay:3.15::el8
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Red Hat Red Hat Quay 3.16     cpe:/a:redhat:quay:3.16::el9
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Red Hat Red Hat Quay 3.1     cpe:/a:redhat:quay:3.10::el8
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Red Hat Red Hat Quay 3.9     cpe:/a:redhat:quay:3.9::el8
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Red Hat Red Hat Satellite 6.18     cpe:/a:redhat:satellite:6.18::el9
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Red Hat Red Hat Enterprise Linux ResilientStorage (v. 8)     cpe:/a:redhat:enterprise_linux:8::resilientstorage
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Red Hat Red Hat Enterprise Linux Resilient Storage E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::resilientstorage
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Red Hat Red Hat Enterprise Linux Resilient Storage EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::resilientstorage
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Red Hat OpenShift Lightspeed     cpe:/a:redhat:openshift_lightspeed
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Red Hat Red Hat Ansible Automation Platform 2     cpe:/a:redhat:ansible_automation_platform:2
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat Red Hat Satellite 6     cpe:/a:redhat:satellite:6
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Red Hat Red Hat Trusted Artifact Signer     cpe:/a:redhat:trusted_artifact_signer:1
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Red Hat Red Hat Advanced Cluster Management for Kubernetes 2     cpe:/a:redhat:acm:2
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Red Hat Red Hat Ansible Automation Platform Ansible Core 2     cpe:/a:redhat:ansible_core:2
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.