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OpenAdvisories
High ALAS2023-2026-1990 3 CVEs

Important: openvpn security update (Amazon Linux 2023)

Published Jul 20, 2026 · Updated Jul 20, 2026

Summary

Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-13122: openvpn Server crash on reception of suitably malformed auth-token, if --auth-gen-token external-auth is active CVE-2026-12996: If the active TLS session has a pending dedicated ACK packet, tls_multi_process sets to_link to ks->ack_write_buf. If in the same execution of tls_multi_process, the initializing session reaches the authenticated stage, the active session will be freed which leaves to_link.data pointing to freed memory. CVE-2026-11771: An attacker controlling an HTTP proxy (or performing MITM on the plaintext pre-TLS proxy connection) can trigger a single 0-byte overrun to a buffer on the stack by sending a crafted NTLM Type 2 challenge response.

Fixed packages 4

ReleasePackageFixed in
Amazon Linux · 2023 openvpn 0:2.6.12-1.amzn2023.0.5
Amazon Linux · 2023 openvpn-debuginfo 0:2.6.12-1.amzn2023.0.5
Amazon Linux · 2023 openvpn-debugsource 0:2.6.12-1.amzn2023.0.5
Amazon Linux · 2023 openvpn-devel 0:2.6.12-1.amzn2023.0.5

Vulnerabilities 3

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-11771.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-12996.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-13122.html