What is CVE-2026-16317?

CVE-2026-16317 is a medium-severity vulnerability in Aws S2n-tls, classified under Improper Validation of Integrity Check Value. CVSS score: 6.5/10. Published 2026-07-21.

How severe is CVE-2026-16317?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Aws S2n-tls

CVE-2026-16317

Missing validation of the outer content_type byte on TLS 1.3 encrypted records in s2n-tls allows an active man-in-the-middle to silently discard individual application data records without either endpoint detecting the modification. RFC 84…

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L.

Affected products

Aws S2n-tls — versions 0

Weakness classification (CWE)

CWE-354 — Improper Validation of Integrity Check Value

References

ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes, patch)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes)

Frequently asked questions

What is CVE-2026-16317?: CVE-2026-16317 is a medium-severity vulnerability in Aws S2n-tls, classified under Improper Validation of Integrity Check Value. CVSS score: 6.5/10. Published 2026-07-21.
How severe is CVE-2026-16317?: Medium severity. CVSS v3 base score is 6.5 out of 10.