CVE-2026-45446: Incorrect Tag Processing for Empty Messages in AES-GCM-SIV and AES-SIV modes

Published May 27, 2026
·
Updated

Incorrect Tag Processing for Empty Messages in AES-GCM-SIV and AES-SIV modes

Other sources

Issue summary: The implementations of AES-SIV (RFC 5297) and AES-GCM-SIV (RFC 8452) mishandle the authentication of AAD (Additional Authenticated Data) with an empty ciphertext allowing a forgery of such messages.

— Launchpad

Affected Software

8 affected componentsFixes available
OpenSSL OpenSSL>=3.0, >=3.2
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 openssl 3.3.5-5<3.3.7-3
3.3.7-3

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 3.3.7-3
  3. Upgrade

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

    Fixed in 3.0.20
  4. Upgrade

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

    Fixed in 3.4.5
  5. Upgrade

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

    Fixed in 3.5.6
  6. Upgrade

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

    Fixed in 3.6.2
  7. Upgrade

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

    Fixed in 4.0.1

Event History

May 27, 2026
Data Sourced
via Red Hat·02:22 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·08:04 AM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·08:04 AM
Affected Software
Updated
via Microsoft·08:04 AM
DescriptionSeverity

Frequently Asked Questions

1

What is the severity of CVE-2026-45446?

The severity of CVE-2026-45446 is classified as medium with a CVSS score of 4.8.

2

What vulnerabilities are associated with CVE-2026-45446?

CVE-2026-45446 is associated with incorrect tag processing for empty messages in AES-GCM-SIV and AES-SIV modes.

3

How does CVE-2026-45446 affect AES-GCM-SIV and AES-SIV modes?

CVE-2026-45446 affects AES-GCM-SIV and AES-SIV modes by mishandling the authentication process for empty messages.

4

How can I mitigate the risks posed by CVE-2026-45446?

Mitigation strategies for CVE-2026-45446 involve updating to a patched version of OpenSSL that addresses the tag processing issues.

5

Which software versions are impacted by CVE-2026-45446?

CVE-2026-45446 impacts OpenSSL and Debian's version of OpenSSL that utilize AES-SIV and AES-GCM-SIV modes.

Company

Resources

Contact

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