TLS 1.3 Vulnerability in Botan Cryptography Library
CVE-2026-34582

8.7HIGH

Key Information:

Vendor

Randombit

Status
Botan
Vendor
CVE Published:
7 April 2026

What is CVE-2026-34582?

The Botan cryptography library, utilized extensively in various applications for secure data handling, has a vulnerability in its TLS 1.3 implementation. This issue allows for the processing of ApplicationData records before the necessary Finished message is received. Consequently, this can enable a malicious client to bypass enforced client authentication, compromising the communication's integrity. Users are strongly advised to upgrade to version 3.11.1 or later to mitigate this risk.

Affected Version(s)

botan < 3.11.1

References

https://github.com/randombit/botan/security/advisories/GH...
x_refsource_CONFIRM

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.