CVE-2026-3336
HIGH7.5EPSS 0.01%PKCS7_verify Certificate Chain Validation Bypass in AWS-LC
Published: 3/3/2026Modified: 3/21/2026
Description
Improper certificate validation in `PKCS7_verify()` in AWS-LC allows an unauthenticated user to bypass certificate chain verification when processing PKCS7 objects with multiple signers, except the final signer. Customers of AWS services do not need to take action. `aws-lc-sys` contains code from AWS-LC. Applications using `aws-lc-sys` should upgrade to the most recent release of `aws-lc-sys`. There is no workaround; applications using `aws-lc-sys` should upgrade to the most recent release of aws-lc-sys.
Affected packages (2)
- crates.io/aws-lc-sys>= 0.24.0, < 0.38.0
- crates.io/aws-lc-sys>= 0.24.0, < 0.38.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
References (7)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-3336
- PATCHhttps://crates.io/crates/aws-lc-sys
- PATCHhttps://github.com/aws/aws-lc-rs
- WEBhttps://aws.amazon.com/security/security-bulletins/2026-005-AWS
- WEBhttps://github.com/aws/aws-lc-rs/security/advisories/GHSA-vw5v-4f2q-w9xf
- WEBhttps://github.com/aws/aws-lc/security/advisories/GHSA-cfwj-9wp5-wqvp
- WEBhttps://rustsec.org/advisories/RUSTSEC-2026-0046.html