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High ALAS2023-2026-1510 4 CVEs

Important: mount-s3 security update (Amazon Linux 2023)

Published Mar 30, 2026 · Updated Apr 1, 2026

Summary

Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: 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 3

ReleasePackageFixed in
Amazon Linux · 2023 mount-s3 0:1.22.2-1.amzn2023
Amazon Linux · 2023 mount-s3-debuginfo 0:1.22.2-1.amzn2023
Amazon Linux · 2023 mount-s3-debugsource 0:1.22.2-1.amzn2023

Vulnerabilities 4

  • High 7.5

    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…

  • High 7.5

    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…

  • Medium 6.8

    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…

  • Medium 5.9

    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…

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