AWS-LC: Improper Verification of Cryptographic Signature
CVE-2026-3338 is a high-severity improper verification of cryptographic signature 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 0.78% chance of exploitation within 30 days, higher than 56% 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 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.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Verification of Cryptographic Signature
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
More Improper Verification of Cryptographic Signature vulnerabilities (CWE-347)
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 Verification of Cryptographic Signature vulnerabilities
- 7.5 High severity
- 8.8 High severity
- 8.1 High severity
- 8.1 High severity
- 7.5 High severity
- 7.5 High severity
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