CVE-2026-34182: CMS AuthEnvelopedData Processing May Accept Forged Messages

Published May 27, 2026
·
Updated

CMS AuthEnvelopedData Processing May Accept Forged Messages

Other sources

Issue Summary: Cryptographic Message Services (CMS) processing fails to perform sufficient input validation on the cipher and tag length fields of AuthEnvelopedData containers, leading to various potential compromises.

— Launchpad

Affected Software

9 affected componentsFixes available
OpenSSL OpenSSL
debian/openssl<=3.0.20-1~deb12u1, <=3.5.6-1~deb13u1, <=3.6.2-1
1.1.1w-0+deb11u11.1.1w-0+deb11u73.0.20-1~deb12u23.5.6-1~deb13u2
OpenSSL OpenSSL>=3.0.0<3.0.21
OpenSSL OpenSSL>=3.4.0<3.4.6
OpenSSL OpenSSL>=3.5.0<3.5.7
OpenSSL OpenSSL>=3.6.0<3.6.3
OpenSSL OpenSSL=4.0.0
Microsoft azl3 edk2 20240524git3e722403cd16-17<20240524git3e722403cd16-18
20240524git3e722403cd16-18
Microsoft azl3 openssl 3.3.5-5<3.3.7-2
3.3.7-2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade debian/openssl to a version that resolves this vulnerability.

    Fixed in 1.1.1w-0+deb11u1Fixed in 1.1.1w-0+deb11u7Fixed in 3.0.20-1~deb12u2Fixed in 3.5.6-1~deb13u2
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 20240524git3e722403cd16-18
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 3.3.7-2
  4. Upgrade

    Upgrade OpenSSL to a version that resolves this vulnerability.

    Fixed in 3.0.21
  5. Upgrade

    Upgrade OpenSSL to a version that resolves this vulnerability.

    Fixed in 3.4.6
  6. Upgrade

    Upgrade OpenSSL to a version that resolves this vulnerability.

    Fixed in 3.5.7
  7. Upgrade

    Upgrade OpenSSL to a version that resolves this vulnerability.

    Fixed in 3.6.3
  8. Upgrade

    Upgrade OpenSSL to a version that resolves this vulnerability.

    Fixed in 4.0.1

Event History

May 27, 2026
Data Sourced
via Red Hat·02:00 PM
DescriptionSeverityAffected Software
Jun 9, 2026
CVE Published
via MITRE·04:03 PM
Data Sourced
via MITRE·04:03 PM
DescriptionWeakness
Data Sourced
via NVD·05:17 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·05:17 PM
RemedyAffected Software
Data Sourced
via Ubuntu·08:07 PM
RemedyDescriptionSeverityAffected Software
Jun 10, 2026
Data Sourced
via Launchpad·08:09 PM
Description
Jun 11, 2026
Data Sourced
via Debian·08:10 PM
DescriptionAffected Software
Jun 13, 2026
Data Sourced
via Microsoft·08:03 AM
DescriptionSeverityWeaknessAffected Software
Updated
via Microsoft·08:03 AM
Affected Software
Updated
via Microsoft·08:03 AM
DescriptionSeverity
Updated
via Microsoft·08:03 AM
DescriptionSeverityWeakness

Frequently Asked Questions

1

What is the severity of CVE-2026-34182?

The severity of CVE-2026-34182 is critical with a CVSS score of 9.1.

2

How do I fix CVE-2026-34182?

To fix CVE-2026-34182, update OpenSSL to the latest version that addresses the vulnerability.

3

What issue does CVE-2026-34182 expose in OpenSSL?

CVE-2026-34182 exposes a potential for accepting forged messages due to insufficient input validation in CMS AuthEnvelopedData processing.

4

Which software versions are affected by CVE-2026-34182?

CVE-2026-34182 affects the OpenSSL library, including Debian's OpenSSL package.

5

What are the potential consequences of CVE-2026-34182?

The potential consequences of CVE-2026-34182 include various compromises from accepting malformed AuthEnvelopedData messages.

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