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MEDIUM

CVE-2026-26007

CVSS v3

6.5

MEDIUM

EPSS Score

0.4 %

exploit probability, as of 2026-10-17

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • cryptographyPyPIall versions · fixed in 46.0.5
  • fence-agents-apcAlmaLinux:8all versions · fixed in 4.2.1-129.el8_10.25and 47 other packages

Vendor advisories

  • CVE-2026-26007 Red Hat Product Security885 products fixed · 39 known affected

    cryptography: cryptography Subgroup Attack Due to Missing Subgroup Validation for SECT Curves

    exploit-intelligence/vulnerability-analysis-rhel9 as a component of Exploit Intelligence · mta/mta-solution-server-rhel9 as a component of Migration Toolkit for Applications 8 · openshift-lightspeed/lightspeed-ocp-rag-rhel9 as a component of OpenShift Lightspeed

  • RHSA-2026:22993 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: satellite/foreman-mcp-server-rhel9 container image available as a Technology Preview

  • RHSA-2026:22330 Red Hat Product Security189 products fixed

    Red Hat Security Advisory: fence-agents security update

  • RHSA-2026:21517 Red Hat Product Security189 products fixed

    Red Hat Security Advisory: fence-agents security update

  • RHSA-2026:21431 Red Hat Product Security96 products fixed

    Red Hat Security Advisory: fence-agents security update

  • RHSA-2026:19355 Red Hat Product Security96 products fixed

    Red Hat Security Advisory: fence-agents security update

16 more advisories

Full record on NVD

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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Published
2026-02-10
Last Modified
2026-02-23

Frequently asked questions

What is CVE-2026-26007?

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.

Is CVE-2026-26007 actively exploited?

Active exploitation of CVE-2026-26007 has not been confirmed. Its EPSS score was 0.4% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-26007?

CVE-2026-26007 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

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