# AWS-LC has Timing Side-Channel in AES-CCM Tag Verification

Advisory record · `GHSA-65p9-r9h6-22vj`

- **Identifiers:** `GHSA-65p9-r9h6-22vj` · `CVE-2026-3337` · `GHSA-frmv-5gcm-jwxh` · `RUSTSEC-2026-0043` · `RUSTSEC-2026-0045`
- **State:** Confirmed
- **Severity:** CVSS 8.2 High
- **Critical:** No
- **Weakness (CWE):** [CWE-208](https://cwe.mitre.org/data/definitions/208.html)
- **Tags:** [CWE-208](https://agentprime.io/advisories/tag/cwe-208.md)
- **Published:** 3 Mar 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 3 Mar 2026, 20:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `aws-lc-sys` (crates.io): affected `>=0.14.0, <0.38.0`; fixed in `0.38.0`
- `aws-lc-fips-sys` (crates.io): affected `>=0.13.0, <0.13.12`; fixed in `0.13.12`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 8.2 High, CVSS 4.0: `CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N`, from CNA (AMZN)

- **CISA KEV:** Not listed.
- **EPSS:** 0.011, the 65th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:17 UTC: First seen by agentprime
- 31 Oct 2026, 15:17 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-65p9-r9h6-22vj)

## Sources

- [GitHub Advisory Database: GHSA-65p9-r9h6-22vj](https://github.com/advisories/GHSA-65p9-r9h6-22vj)
- [OSV: GHSA-65p9-r9h6-22vj](https://osv.dev/vulnerability/GHSA-65p9-r9h6-22vj)
- <https://github.com/aws/aws-lc-rs/security/advisories/GHSA-65p9-r9h6-22vj>
- <https://github.com/aws/aws-lc/security/advisories/GHSA-frmv-5gcm-jwxh>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-3337>
- <https://aws.amazon.com/security/security-bulletins/2026-005-AWS>
- <https://github.com/aws/aws-lc-rs>
- <https://rustsec.org/advisories/RUSTSEC-2026-0043.html>
- <https://rustsec.org/advisories/RUSTSEC-2026-0045.html>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-65p9-r9h6-22vj>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-65p9-r9h6-22vj/>. Everything for agents: <https://agentprime.io/llms.txt>.