TI-2026-02879 Aliases CVE-2026-3336

PKCS7_verify Certificate Chain Validation Bypass in AWS-LC

MEDIUM 45CWE-295Published 2026-03-02 · Updated 2026-08-21

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Spoofing
Confidentiality · integrity · availability: None · High · None
Fix status: Partial Red Hat: 1 fixed, 5 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-295.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00738 54th percentileScored 2026-11-07

Fix Partial AWS-LC (AWS): 1.69.0Red Hat: 1 advisoryRed Hat: 1 fixed, 5 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
AWS	AWS-LC	1.41.0 to before 1.69.0	1.69.0	Patch available	CNA

AWS-LC VendorAWS Affected 1.41.0 to before 1.69.0 Fixed in 1.69.0 Patch available CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:amazon:aws-lc-sys::::::rust::*	0.24.0 to before 0.38.0	Vulnerable	AWS
cpe:2.3:a:amazon:aws_libcrypto::::::::	1.41.0 to before 1.69.0	Vulnerable	AWS

cpe:2.3:a:amazon:aws-lc-sys:*:*:*:*:*:rust:*:* Versions 0.24.0 to before 0.38.0 Vulnerable ·AWS
cpe:2.3:a:amazon:aws_libcrypto:*:*:*:*:*:*:*:* Versions 1.41.0 to before 1.69.0 Vulnerable ·AWS

Remediation

Fix · CNA AWS-LC (AWS) Fixed in 1.69.0

Red Hat 1 advisory

RHSA-2026:5459 Released 2026-03-23 · Red Hat rating Important
RHTAS 1.3.3 - Red Hat Trusted Artifact Signer Release
- Red Hat Trusted Artifact Signer 1.3 registry.redhat.io/rhtas/tuffer-rhel9, registry.redhat.io/rhtas/tuftool-rhel9

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Advisory · 2026-03-02
AWS-LC — aws.amazon.com/security/security-bulletins/2026-005-AWS
3 records Highest priority Priority MEDIUM 2 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2026-02881 PKCS7_verify Signature Validation Bypass in AWS-LCPriority MEDIUM 45
- TI-2026-02880 Timing Side-Channel in AES-CCM Tag Verification in AWS-LCPriority LOW 38
Show all 3 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Product	Status	Plan or fix
Confidential Compute Attestation	Affected	No fix planned: Will not fix
Red Hat Enterprise Linux 10	Affected	No fix planned: Will not fix
Red Hat Enterprise Linux 9	Affected	No fix planned: Will not fix
Red Hat OpenShift Container Platform 4	Affected	No fix planned: Will not fix
Red Hat Trusted Profile Analyzer	Affected	No fix yet
Red Hat Trusted Artifact Signer 1.3	Fixed	RHSA-2026:5459

Not affected: 3 products

Confidential Compute Attestation
Red Hat Enterprise Linux 10
Red Hat OpenShift Update Service

Timeline

2026-10-02 Threatist record created from CVE-2026-3336
2026-10-25 EPSS moved to the 50th–90th percentile

References

Patch 1

https://github.com/aws/aws-lc/releases/tag/v1.69.0

Advisory 2

TI-2026-02881 PKCS7_verify Signature Validation Bypass in AWS-LC CVSS 4.0HIGH 8.7
TI-2026-02880 Timing Side-Channel in AES-CCM Tag Verification in AWS-LC CVSS 4.0HIGH 8.2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences