Vulnerability DatabaseCVE-2026-74901
Mend.io Vulnerability Database
The largest open source vulnerability database
What is a Vulnerability ID?
New vulnerability? Tell us about it!
CVE-2026-74901
Published:August 17, 2026
Updated:September 01, 2026
openssl_encrypt versions before 1.4.0 contain an authentication bypass vulnerability in pqc.py where AES-GCM decryption failures trigger fallback to unauthenticated AES-CTR mode. Attackers can modify ciphertext in transit to bypass integrity verification and perform bit-flipping attacks without detection.
Affected Packages
https://github.com/jahlives/openssl_encrypt.git (GITHUB):
Affected version(s) >=v1.0.0 <v1.4.0
Fix Suggestion:
Update to version v1.4.0
openssl-encrypt (PYTHON):
Affected version(s) >=0.2.2 <1.4.0
Fix Suggestion:
Update to version 1.4.0
Related Resources (4)
https://www.vulncheck.com/advisories/openssl-encrypt-before-authentication-bypass-via-aes-ctr-fallback
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74901.json
https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-w4j7-wfgw-r52w
https://nvd.nist.gov/vuln/detail/CVE-2026-74901
Do you need more information?
Contact Us
CVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Verification of Cryptographic Signature
CWE-347
EPSS
Base Score:
0.24