CVE-2026-41319: jstedfast MailKit, инжекция

Описание

Оригинално описание

MailKit is a cross-platform mail client library built on top of MimeKit. A STARTTLS Response Injection vulnerability in versions prior to 4.16.0 allows a Man-in-the-Middle attacker to inject arbitrary protocol responses across the plaintext-to-TLS trust boundary, enabling SASL authentication mechanism downgrade (e.g., forcing PLAIN instead of SCRAM-SHA-256). The internal read buffer in `SmtpStream`, `ImapStream`, and `Pop3Stream` is not flushed when the underlying stream is replaced with `SslStream` during STARTTLS upgrade, causing pre-TLS attacker-injected data to be processed as trusted post-TLS responses. Version 4.16.0 patches the issue.

Засегнати продукти

• jstedfast MailKit: < 4.16.0

Вид слабост

• CWE-74 Неправилна неутрализация на специални елементи в изходни данни

История

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-41319
• https://nvd.nist.gov/vuln/detail/CVE-2026-41319
• https://github.com/jstedfast/MailKit/security/advisories/GHSA-9j88-vvj5-vhgr