Expected Behavior Violation Affecting openssl package, versions [3.5.0,3.5.9)[3.6.0,3.6.5)[4.0.1,4.0.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CONAN-OPENSSL-20537031
- published6 Oct 2026
- disclosed29 Sept 2026
- creditAli Firas,Nikolas Gauder
Introduced: 29 Sep 2026
NewCVE-2026-35191 (opens in a new tab)How to fix?
Upgrade openssl to version 3.5.9, 3.6.5, 4.0.3 or higher.
Overview
Affected versions of this package are vulnerable to Expected Behavior Violation in the QUIC server's unvalidated amplification credit accounting, which adds the full datagram length once per QUIC packet it contains rather than once per datagram. An attacker can use the server as a DDoS amplifier beyond the 3x limit RFC 9000 sets, by spoofing a source address and coalescing several packets into each datagram. This applies to the QUIC server before address validation completes.