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High ALAS2-2026-3245 5 CVEs

Important: amazon-efs-utils security update (Amazon Linux 2)

Published Apr 13, 2026 · Updated Apr 13, 2026

Ecosystem: Amazon Linux

Summary

Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: CVE-2026-4428: A logic error in CRL distribution point validation in AWS-LC before 1.71.0 causes partitioned CRLs to be incorrectly rejected as out of scope, which allows a revoked certificate to bypass certificate revocation checks. To remediate this issue, users should upgrade to AWS-LC 1.71.0 or AWS-LC-FIPS-3.3.0. CVE-2026-3338: 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. CVE-2026-3337: Observable timing discrepancy in AES-CCM decryption in AWS-LC allows an unauthenticated user to potentially determine authentication tag validity via timing analysis. The impacted implementations are through the EVP CIPHER API: EVP_aes_128_ccm, EVP_aes_192_ccm, and EVP_aes_256_ccm. Customers of AWS services do not need to take action. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0. CVE-2026-3336: 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. CVE-2026-25727: time provides date and time handling in Rust. From 0.3.6 to before 0.3.47, when user-provided input is provided to any type that parses with the RFC 2822 format, a denial of service attack via stack exhaustion is possible. The attack relies on formally deprecated and rarely-used features that are part of the RFC 2822 format used in a malicious manner. Ordinary, non-malicious input will never encounter this scenario. A limit to the depth of recursion was added in v0.3.47. From this version, an error will be returned rather than exhausting the stack.

Fixed packages 1

ReleasePackageFixed in
Amazon Linux · 2 amazon-efs-utils 0:3.0.0-4.amzn2

Vulnerabilities 5

  • High 7.5
    CVE-2026-3336

    PKCS7_verify Certificate Chain Validation Bypass in AWS-LC

    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 act…

    AWS AWS-LC aws-lc-sys crates.io
  • High 7.5
    CVE-2026-3338

    PKCS7_verify Signature Validation Bypass in AWS-LC

    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…

    AWS AWS-LC aws-lc-sys crates.io
  • High 7.4
    CVE-2026-4428

    CRL Distribution Point Scope Check Logic Error in AWS-LC

    A logic error in CRL distribution point validation in AWS-LC before 1.71.0 causes partitioned CRLs to be incorrectly rejected as out of scope, which allows a revoked certificate to bypass certificate revocation checks. To remediate this issue, users should up…

    AWS AWS-LC AWS-LC-FIPS aws-lc-sys crates.io
  • Medium 6.8
    CVE-2026-25727

    time affected by a stack exhaustion denial of service attack

    time provides date and time handling in Rust. From 0.3.6 to before 0.3.47, when user-provided input is provided to any type that parses with the RFC 2822 format, a denial of service attack via stack exhaustion is possible. The attack relies on formally deprec…

    time-rs time rust kata-containers Debian Ubuntu Azure Linux Wolfi crates.io
  • Medium 5.9
    CVE-2026-3337

    Timing Side-Channel in AES-CCM Tag Verification in AWS-LC

    Observable timing discrepancy in AES-CCM decryption in AWS-LC allows an unauthenticated user to potentially determine authentication tag validity via timing analysis. The impacted implementations are through the EVP CIPHER API: EVP_aes_128_ccm, EVP_aes_192_cc…

    AWS AWS-LC AWS-LC-FIPS aws-lc-sys crates.io

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-25727.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-3336.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-3337.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-3338.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-4428.html