AWS-LC: Improper Certificate Validation
CVE-2026-3336 is a high-severity improper certificate validation vulnerability in AWS-LC from AWS, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 1.69.0 as the first without the flaw, so updating AWS-LC to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.74% chance of exploitation within 30 days, higher than 55% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update AWS-LC to 1.69.0 or a later version.
- Update Aws-lc-sys to 0.38.0 or a later version.
- Update Aws Libcrypto to 1.69.0 or a later version.
- Read the advisory on aws.amazon.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| AWS | AWS-LC | 1.41.0 up to, but not including, 1.69.0 | 1.69.0 |
| Red Hat | Red Hat Trusted Artifact Signer 1.3 | Not specified in the record | Not stated |
| Red Hat | Confidential Compute Attestation | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 10 | Not specified in the record | Not stated |
| Red Hat | Red Hat Enterprise Linux 9 | Not specified in the record | Not stated |
| Red Hat | Red Hat OpenShift Container Platform 4 | Not specified in the record | Not stated |
| Red Hat | Red Hat OpenShift Update Service | Not specified in the record | Not stated |
| Red Hat | Red Hat Trusted Profile Analyzer | Not specified in the record | Not stated |
| Amazon | Aws-lc-sys | 0.24.0 up to, but not including, 0.38.0 | 0.38.0 |
| Amazon | Aws Libcrypto | 1.41.0 up to, but not including, 1.69.0 | 1.69.0 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- HighData or code can be modified at will.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N. Scored by CNA.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.7 | High | CNA |
| CVSS 3.1 | 7.5 | High | CNA |
| CVSS 3.1 | 7.5 | High | CNA |
Official description
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.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Certificate Validation
The product does not validate, or incorrectly validates, a certificate.
How developers prevent this class of flaw
- Certificates should be carefully managed and checked to assure that data are encrypted with the intended owner's public key.
- If certificate pinning is being used, ensure that all relevant properties of the certificate are fully validated before the certificate is pinned, including the hostname.
More Improper Certificate Validation vulnerabilities (CWE-295)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Patches and release notes
- github.com/aws/aws-lc/releases/tag/v1.69.0Release Notes
Other references
Other vulnerabilities in AWS-LC
- 7.4 High severity
- 7.5 High severity
Recent Improper Certificate Validation vulnerabilities
- 8.1 High severity
- 7.4 High severity
- 7.4 High severity
- 9.1 Critical severity
- 8.1 High severity
- 9.4 Critical severity
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