PKCS7_verify Signature Validation Bypass in AWS-LC
cve-program · CVE-2026-3338
PublishedImproper signature validation in PKCS7_verify() in AWS-LC allows an unauthenticated user to bypass signature verification when processing PKCS7 objects with Authenticated Attributes. Customers of AWS services do not need to take action. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0.
Read the publisher's advisoryeuvd · EUVD-2026-9266
PublishedImproper signature validation in PKCS7_verify() in AWS-LC allows an unauthenticated user to bypass signature verification when processing PKCS7 objects with Authenticated Attributes. Customers of AWS services do not need to take action. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0.
Read the publisher's advisorynvd · CVE-2026-3338
PublishedImproper signature validation in PKCS7_verify() in AWS-LC allows an unauthenticated user to bypass signature verification when processing PKCS7 objects with Authenticated Attributes. Customers of AWS services do not need to take action. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0.
Read the publisher's advisoryosv · GHSA-hfpc-8r3f-gw53
Published### Summary AWS-LC is an open-source, general-purpose cryptographic library. ### Impact Improper signature validation in PKCS7_verify() in AWS-LC allows an unauthenticated user to bypass signature verification when processing PKCS7 objects with Authenticated Attributes. 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. #### Impacted versions: aws-lc-sys versions: >= 0.24.0, < 0.38.0 ### Patches The patch is included in v0.38.0 ### Workarounds There is no workaround. Applications using aws-lc-sys should upgrade to the most recent release of aws-lc-sys. ### Resources If there are any questions or comments about this advisory, contact [AWS/Amazon] Security via the [vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting) or directly via email to [[email protected]](mailto:[email protected]). Please do not create a public GitHub issue.
Read the publisher's advisoryosv · RUSTSEC-2026-0047
PublishedImproper signature validation in `PKCS7_verify()` in AWS-LC allows an unauthenticated user to bypass signature verification when processing PKCS7 objects with Authenticated Attributes. 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`.
Read the publisher's advisoryAffected versions, risk and source history
Related advisories and sources
Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.
CVE-2026-3338 · CVE overview and exploitation status
cve-program · CVE-2026-3338
- https://aws.amazon.com/security/security-bulletins/2026-005-AWS/
- https://github.com/aws/aws-lc/releases/tag/v1.69.0
- https://github.com/aws/aws-lc/security/advisories/GHSA-jchq-39cv-q4wj
euvd · EUVD-2026-9266
- https://aws.amazon.com/security/security-bulletins/2026-005-AWS/
- https://github.com/aws/aws-lc/releases/tag/v1.69.0
- https://github.com/aws/aws-lc/security/advisories/GHSA-jchq-39cv-q4wj
nvd · CVE-2026-3338
- https://aws.amazon.com/security/security-bulletins/2026-005-AWS/
- https://github.com/aws/aws-lc/releases/tag/v1.69.0
- https://github.com/aws/aws-lc/security/advisories/GHSA-jchq-39cv-q4wj
- https://access.redhat.com/errata/RHSA-2026:5459
- https://access.redhat.com/security/cve/CVE-2026-3338
- https://bugzilla.redhat.com/show_bug.cgi?id=2444025
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3338.json
osv · GHSA-hfpc-8r3f-gw53
- https://github.com/aws/aws-lc-rs/security/advisories/GHSA-hfpc-8r3f-gw53
- https://github.com/aws/aws-lc/security/advisories/GHSA-jchq-39cv-q4wj
- https://nvd.nist.gov/vuln/detail/CVE-2026-3338
- https://aws.amazon.com/security/security-bulletins/2026-005-AWS
- https://github.com/aws/aws-lc-rs
- https://rustsec.org/advisories/RUSTSEC-2026-0047.html
osv · RUSTSEC-2026-0047
Related changes
Linked by CVE identifier- PKCS7_verify Signature Validation Bypass in AWS-LC · Advisory content revised · 9 Nov 2026