High severity · published Mar 2, 2026
CVE-2026-3338
PKCS7_verify Signature Validation Bypass in AWS-LC
7.5
CVSS
0.8%
EPSS
No
On KEV
Description
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. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AW
AWS-LC · AWS
1.41.0 before 1.69.0 · source: vendor
AL
Aws Libcrypto · Amazon
1.41.0 before 1.69.0 · source: NVD
AW
Aws-lc-sys · Amazon
0.24.0 before 0.38.0 · source: NVD
CC
Confidential Compute Attestation · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat OpenShift Container Platform 4 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Trusted Artifact Signer 1.3 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Trusted Profile Analyzer · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-3338
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-3338
Vendor Advisory
https://aws.amazon.com/security/security-bulletins/2026-005-AWS/
Release Notes
https://github.com/aws/aws-lc/releases/tag/v1.69.0
Vendor Advisory
https://github.com/aws/aws-lc/security/advisories/GHSA-jchq-39cv-q4wj
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:5459
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-3338
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2444025
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