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CVE

CVE-2026-3338

AWS-LC has PKCS7_verify Signature Validation Bypass
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CVE

CVE-2026-3338

AWS-LC has PKCS7_verify Signature Validation Bypass

Summary

AWS-LC is an open-source, general-purpose cryptographic library.

Impact

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. aws-lc-sys contains code from AWS-LC. Applications using aws-lc-sys should upgrade to the most recent release of aws-lc-sys.

Impacted versions: 

aws-lc-sys versions: >= 0.24.0, < 0.38.0

Patches

The patch is included in v0.38.0

Workarounds

There is no workaround. Applications using aws-lc-sys should upgrade to the most recent release of aws-lc-sys.

Resources

If there are any questions or comments about this advisory, contact AWS/Amazon] Security via the [vulnerability reporting page or directly via email to aws-security@amazon.com. Please do not create a public GitHub issue.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.7
-
4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
C
H
U
-

Related Resources

No items found.

References

https://github.com/aws/aws-lc-rs/security/advisories/GHSA-hfpc-8r3f-gw53, https://github.com/aws/aws-lc/security/advisories/GHSA-jchq-39cv-q4wj, https://nvd.nist.gov/vuln/detail/CVE-2026-3338, https://aws.amazon.com/security/security-bulletins/2026-005-AWS, https://github.com/aws/aws-lc-rs, https://rustsec.org/advisories/RUSTSEC-2026-0047.html

Severity

7.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.5
EPSS Probability
0.00015%
EPSS Percentile
0.03066%
Introduced Version
0.24.0,0
Fix Available
0.38.0,20260311-r0,0.22.1-r2,2.7.5-r0,2.4.2-r2,1.19.5-r4,0.1.9-r0,0.1.7-r0,26.3.2-r0,1.6.6-r2,2.342.0-r1,0.23.0-r1,1.7.1-r1,0.111.0-r3,2.5.14-r1,0.65.0-r1,0.15.0-r5,1.28.2-r5,0.10.8-r0,0.227.1-r1,0.44.0-r0,1.23.1-r1,1.27.8-r1,1.28.5-r1,1.29.1-r1

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