DEBIAN-CVE-2026-34872

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Source
https://security-tracker.debian.org/tracker/CVE-2026-34872
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34872.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-34872
Upstream
Published
2026-04-01T20:16:27Z
Modified
2026-09-14T17:03:08Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Summary
[none]
Details

An issue was discovered in Mbed TLS 3.5.x and 3.6.x through 3.6.5 and TF-PSA-Crypto 1.0. There is a lack of contributory behavior in FFDH due to improper input validation. Using finite-field Diffie-Hellman, the other party can force the shared secret into a small set of values (lack of contributory behavior). This is a problem for protocols that depend on contributory behavior (which is not the case for TLS). The attack can be carried by the peer, or depending on the protocol by an active network attacker (person in the middle).

References

Affected packages

Debian:12 / mbedtls

Package

Name
mbedtls
Purl
pkg:deb/debian/mbedtls?arch=source&distro=bookworm

Affected ranges

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

Affected versions

2.*
2.28.3-1
2.28.4-1
2.28.5-1
2.28.6-1
2.28.7-1
2.28.7-1.1~exp1
2.28.7-1.1
2.28.8-1
3.*
3.6.0-1
3.6.0-2
3.6.0-3
3.6.2-1
3.6.2-2
3.6.2-3
3.6.3-1
3.6.4-1
3.6.4-2
3.6.5-0.1~deb13u1
3.6.5-0.1
3.6.6-0.1~deb13u1
3.6.6-0.1
3.6.7-2
3.6.7-3

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34872.json"

Debian:13 / mbedtls

Package

Name
mbedtls
Purl
pkg:deb/debian/mbedtls?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.6.6-0.1~deb13u1

Affected versions

3.*
3.6.4-2
3.6.5-0.1~deb13u1
3.6.5-0.1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34872.json"

Debian:14 / mbedtls

Package

Name
mbedtls
Purl
pkg:deb/debian/mbedtls?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.6.6-0.1

Affected versions

3.*
3.6.4-2
3.6.5-0.1~deb13u1
3.6.5-0.1
3.6.6-0.1~deb13u1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34872.json"