CVE-2026-16318: s2n-tls 0 through v1.7.5

CVE-2026-16318. CVSS 3.1 base score 5.3 (MEDIUM, Source advisory). EPSS 0.00529 (percentile 0.43979), scored 24-Oct-2026.

Affected technology

s2n-tls · 0 through v1.7.5
Amazon

Component: Not specified by the source

Attack conditions (Source advisory, CVSS 4.0): Network (remote) · No privileges required · No user interaction required

What an attacker can do

An unauthenticated user can amplify the issue by deliberately forcing HelloRetryRequests, causing up to approximately 64 KB of unreachable memory per handshake. Source advisory’s CVSS 4.0 assessment (base score 6.9/10) rates confidentiality and integrity impact as none; availability impact as low.

Published 25-Oct-2026 01:30 UTC

CWE: CWE-401
CCR priority: 21.3 /100 (P4)
CVSS 3.1: 5.3 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L · Source advisory
EPSS: 0.00529 · percentile 0.43979 · 2026-10-24
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-25 01:28:19.133527+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-16318.html