CVE-2026-16317

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Source
https://cve.org/CVERecord?id=CVE-2026-16317
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-16317.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-16317
Aliases
  • GHSA-684c-v35q-fvx7
Published
2026-07-21T20:12:48.047Z
Modified
2026-07-22T05:31:23.460933972Z
Severity
  • 8.3 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:L/SA:N CVSS Calculator
Summary
Silent Drop of TLS 1.3 Encrypted Records in s2n-tls
Details

Missing validation of the outer contenttype 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 8446 Section 5.2 requires that the outer contenttype of all encrypted TLS 1.3 records must be applicationdata (0x17). The s2n-tls AEAD implementation hardcodes this value in the additional authenticated data rather than using the actual wire byte, so the outer contenttype is not covered by the authentication tag.

This enables selective suppression of application data. In HTTP pipelining scenarios, dropping a TLS record containing an HTTP request can cause request/response desynchronization, where subsequent responses are delivered to the wrong requests. In write-heavy workloads, a dropped record containing a write request can result in undetectable data loss when the client interprets a subsequent success response as confirmation of the dropped write.

All TLS 1.3 connections are affected. Both TLS clients and servers are affected. TLS 1.2 and QUIC connections are not affected.

We recommend you upgrade s2n-tls to version v1.7.6

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/16xxx/CVE-2026-16317.json",
    "cna_assigner": "AMZN",
    "cwe_ids": [
        "CWE-354"
    ]
}
References

Affected packages

Git / github.com/aws/s2n-tls

Affected ranges

Type
GIT
Repo
https://github.com/aws/s2n-tls
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
f5f6c6c2ce2370de1aa3ade6899a7321d1127bb8
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "1.7.5"
        }
    ]
}

Affected versions

0.*
0.10.24
1.*
1.0.3
1.3.19
1.7.1
v0.*
v0.10.0
v0.10.1
v0.10.10
v0.10.11
v0.10.12
v0.10.13
v0.10.14
v0.10.15
v0.10.16
v0.10.17
v0.10.18
v0.10.19
v0.10.2
v0.10.20
v0.10.21
v0.10.22
v0.10.23
v0.10.24
v0.10.25
v0.10.26
v0.10.3
v0.10.4
v0.10.5
v0.10.6
v0.10.7
v0.10.8
v0.10.9
v0.9.0
v1.*
v1.0.0
v1.0.1
v1.0.10
v1.0.11
v1.0.12
v1.0.13
v1.0.14
v1.0.15
v1.0.16
v1.0.17
v1.0.18
v1.0.19
v1.0.2
v1.0.4
v1.0.5
v1.0.8
v1.0.9
v1.1.0
v1.1.1
v1.1.2
v1.2.0
v1.2.1
v1.3.0
v1.3.1
v1.3.10
v1.3.11
v1.3.12
v1.3.13
v1.3.14
v1.3.15
v1.3.16
v1.3.17
v1.3.18
v1.3.19
v1.3.2
v1.3.20
v1.3.21
v1.3.22
v1.3.23
v1.3.24
v1.3.25
v1.3.26
v1.3.27
v1.3.28
v1.3.29
v1.3.3
v1.3.30
v1.3.31
v1.3.32
v1.3.33
v1.3.34
v1.3.35
v1.3.36
v1.3.37
v1.3.38
v1.3.39
v1.3.4
v1.3.40
v1.3.41
v1.3.42
v1.3.43
v1.3.44
v1.3.45
v1.3.46
v1.3.47
v1.3.48
v1.3.49
v1.3.5
v1.3.50
v1.3.51
v1.3.52
v1.3.53
v1.3.54
v1.3.55
v1.3.56
v1.3.6
v1.3.7
v1.3.8
v1.3.9
v1.4.0
v1.4.1
v1.4.10
v1.4.11
v1.4.12
v1.4.13
v1.4.14
v1.4.15
v1.4.16
v1.4.17
v1.4.18
v1.4.2
v1.4.3
v1.4.4
v1.4.5
v1.4.6
v1.4.7
v1.4.8
v1.4.9
v1.5.0
v1.5.1
v1.5.10
v1.5.11
v1.5.12
v1.5.13
v1.5.14
v1.5.15
v1.5.16
v1.5.17
v1.5.18
v1.5.19
v1.5.2
v1.5.20
v1.5.21
v1.5.22
v1.5.23
v1.5.24
v1.5.25
v1.5.26
v1.5.27
v1.5.3
v1.5.4
v1.5.5
v1.5.6
v1.5.7
v1.5.8
v1.5.9
v1.6.0
v1.6.1
v1.6.2
v1.6.3
v1.6.4
v1.7.0
v1.7.2
v1.7.3
v1.7.4
v1.7.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-16317.json"