Vulnerability DatabaseCVE-2026-25834
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CVE-2026-25834
Published:April 01, 2026
Updated:May 16, 2026
Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.
Affected Packages
mbedtls (CONAN):
Affected version(s) >=3.4.1 <3.6.6
Fix Suggestion:
Update to version 3.6.6
https://github.com/Mbed-TLS/mbedtls.git (GITHUB):
Affected version(s) =v4.0.0 <v4.1.0
Fix Suggestion:
Update to version v4.1.0
https://github.com/Mbed-TLS/mbedtls.git (GITHUB):
Affected version(s) >=mbedtls-3.3.0 <mbedtls-3.6.6
Fix Suggestion:
Update to version mbedtls-3.6.6
https://github.com/Mbed-TLS/mbedtls.git (GITHUB):
Affected version(s) >=v3.3.0 <v3.6.6
Fix Suggestion:
Update to version v3.6.6
https://github.com/Mbed-TLS/mbedtls.git (GITHUB):
Affected version(s) =mbedtls-4.0.0 <mbedtls-4.1.0
Fix Suggestion:
Update to version mbedtls-4.1.0
Related Resources (2)
https://mbed-tls.readthedocs.io/en/latest/security-advisories/
https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2026-03-sigalg-injection/
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
LOW
Weakness Type (CWE)
Improper Certificate Validation
CWE-295
Use of a Broken or Risky Cryptographic Algorithm
CWE-327
EPSS
Base Score:
0.02