PT-2026-29578 · Arm · Mbed Tls

M. Heuft · CVE-2026-25834 · Published 2026-04-01 · Updated 2026-06-22

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Name of the Vulnerable Software and Affected Versions Mbed TLS versions 3.3.0 through 3.6.5 and version 4.0.0

Description The Mbed TLS software contains a flaw related to Algorithm Downgrade.

Recommendations Update to a version later than 3.6.5. Update to a version later than 4.0.0.

Exploit

Fix

Improper Certificate Validation

Use of a Broken Cryptographic Algorithm

Weakness Enumeration

CWE-295

CWE-327

Related Identifiers

CVE-2026-25834

OPENSUSE-SU-2026:10498-1

OPENSUSE-SU-2026:20875-1

OPENSUSE-SU-2026:21144-1

SUSE-SU-2026:1952-1

SUSE-SU-2026:21440-1

SUSE-SU-2026:21981-1

SUSE-SU-2026:22016-1

Affected Products

Mbed Tls

References · 54

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25834.json · Exploit
• https://osv.dev/vulnerability/CVE-2026-25834 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-25834 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:10498-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-25834 · Security Note
• https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-sigalg-injection · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-25834 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-25834 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:22016-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-25834 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:21144-1 · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2026-25834 · Vendor Advisory
• https://mbed-tls.readthedocs.io/en/latest/security-advisories · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-25834 · Vendor Advisory
• https://bugzilla.suse.com/1246783 · Note