CVE
CVE-2026-3336
PKCS7_verify Certificate Chain Validation Bypass in AWS-LC
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.
Package Versions Affected
Package Version
patch Availability
No items found.
Automatically patch vulnerabilities without upgrading
Fix Without Upgrading
Detect compatible fix
Apply safe remediation
Fix with a single pull request
CVSS Version
Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.7
-
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
C
H
U
-
Related Resources
No items found.
References
https://crates.io/crates/aws-lc-sys, https://rustsec.org/advisories/RUSTSEC-2026-0046.html, https://aws.amazon.com/security/security-bulletins/2026-005-AWS, https://github.com/aws/aws-lc-rs/security/advisories/GHSA-vw5v-4f2q-w9xf