{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-16317 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-16317 is a high-severity vulnerability in AWS s2n-tls, published on 21 Jul 2026."},"fix_prompt":"Check this codebase for CVE-2026-16317 and fix it if it is affected.\n\nWhat it is: CVE-2026-16317 is a high-severity vulnerability in AWS s2n-tls, published on 21 Jul 2026. \nExploitation: There is no known exploitation of CVE-2026-16317 in the wild and no public exploit code.\n\nAffected product: AWS s2n-tls. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-16317/ (Markdown: https://insights.sbomify.com/CVE-2026-16317/index.md)","id":"CVE-2026-16317","markdown":"https://insights.sbomify.com/CVE-2026-16317/index.md","name":"CVE-2026-16317","record":{"aliases":["GHSA-684c-v35q-fvx7"],"analysis":null,"analysis_generated_by":null,"assigner":"AMZN","cpe":[],"cvss":{"score":8.3,"severity":"high","source":"cna","vector":"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","version":"4.0"},"cwes":[{"id":"CWE-354","name":"Improper Validation of Integrity Check Value"}],"description":"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 8446 Section 5.2 requires that the outer content_type of all encrypted TLS 1.3 records must be application_data (0x17). The s2n-tls AEAD implementation hardcodes this value in the additional authenticated data rather than using the actual wire byte, so the outer content_type is not covered by the authentication tag. \n\nThis 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.\n\nAll TLS 1.3 connections are affected. Both TLS clients and servers are affected. TLS 1.2 and QUIC connections are not affected.\n\nWe recommend you upgrade s2n-tls to version v1.7.6","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Silent Drop of TLS 1.3 Encrypted Records in s2n-tls","id":"CVE-2026-16317","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"QUIC Transport Parameters Memory Leak During HelloRetryRequest in s2n-tls","id":"CVE-2026-16318"},"packages":[],"prev":{"headline":"Malformed IEC 61850 Sampled Values frames cause partial denial of service in StationGuard","id":"CVE-2026-16316"},"products":["s2n-tls"],"published":"2026-07-21","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-22","vendors":["AWS"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-16317/"}