DEBIAN-CVE-2026-26007

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Source
https://security-tracker.debian.org/tracker/CVE-2026-26007
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-26007.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-26007
Upstream
Published
2026-02-10T22:17:00.307Z
Modified
2026-02-11T11:30:18.635457Z
Severity
  • 8.2 (High) CVSS_V4 - 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 CVSS Calculator
Summary
[none]
Details

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to 46.0.5, the publickeyfromnumbers (or EllipticCurvePublicNumbers.publickey()), EllipticCurvePublicNumbers.publickey(), loadderpublickey() and loadpempublickey() 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 = [victimprivatekey]P via ECDH, this leaks information about victimprivatekey mod (smallsubgroup_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.

References

Affected packages

Debian:11 / python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/debian/python-cryptography?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.3.2-1
3.3.2-1+deb11u1
3.4.8-1
3.4.8-2
38.*
38.0.4-1
38.0.4-2
38.0.4-3~deb12u1
38.0.4-3
38.0.4-4
41.*
41.0.7-1
41.0.7-2
41.0.7-3
41.0.7-4
41.0.7-5
42.*
42.0.5-1
42.0.5-2
43.*
43.0.0-1
43.0.0-2
43.0.0-3
44.*
44.0.2-1
44.0.2-2
45.*
45.0.6-1~exp1
45.0.6-1
45.0.7-1
46.*
46.0.1-1~exp1
46.0.1-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-26007.json"

Debian:12 / python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/debian/python-cryptography?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

38.*
38.0.4-3
38.0.4-3+deb12u1
38.0.4-4
41.*
41.0.7-1
41.0.7-2
41.0.7-3
41.0.7-4
41.0.7-5
42.*
42.0.5-1
42.0.5-2
43.*
43.0.0-1
43.0.0-2
43.0.0-3
44.*
44.0.2-1
44.0.2-2
45.*
45.0.6-1~exp1
45.0.6-1
45.0.7-1
46.*
46.0.1-1~exp1
46.0.1-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-26007.json"

Debian:13 / python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/debian/python-cryptography?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

43.*
43.0.0-3
44.*
44.0.2-1
44.0.2-2
45.*
45.0.6-1~exp1
45.0.6-1
45.0.7-1
46.*
46.0.1-1~exp1
46.0.1-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-26007.json"

Debian:14 / python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/debian/python-cryptography?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

43.*
43.0.0-3
44.*
44.0.2-1
44.0.2-2
45.*
45.0.6-1~exp1
45.0.6-1
45.0.7-1
46.*
46.0.1-1~exp1
46.0.1-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-26007.json"