High 7.5Published Mar 2, 2026

CVE-2026-3336Improper 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 fin…

Updated under an hour ago (2026-10-19 06:10 UTC)

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It affects amazon aws-lc-sys and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0.

CVSS: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-295
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jul 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

amazon aws-lc-sys amazon:aws-lc-sys	from 0.24.0 before 0.38.0	NVD
amazon aws_libcrypto amazon:aws_libcrypto	from 1.41.0 before 1.69.0	NVD

References

https://aws.amazon.com/security/security-bulletins/2026-005-AWS/vendor-advisory
https://github.com/aws/aws-lc/releases/tag/v1.69.0release-notes
https://github.com/aws/aws-lc/security/advisories/GHSA-cfwj-9wp5-wqvpvendor-advisory
https://access.redhat.com/errata/RHSA-2026:5459
https://access.redhat.com/security/cve/CVE-2026-3336
https://bugzilla.redhat.com/show_bug.cgi?id=2444026
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3336.json

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.