REDHAT-BUG-2496971: Medium severity OpenSSL OpenSSL extension for PHP vulnerability

Q: Which PHP deployments are affected?

Deployments using PHP 8.2 before 8.2.32, 8.3 before 8.3.32, 8.4 before 8.4.23, or 8.5 before 8.5.8 are affected when they use the OpenSSL extension's AES-WRAP-PAD operation.

Q: What must occur for the flaw to be triggered?

An AES key-wrap-with-padding operation using AES-WRAP-PAD must process plaintext whose RFC 5649 output expansion exceeds the buffer allocation derived from the plaintext length. The resulting OpenSSL write can corrupt heap metadata and abort the application.

Q: How can I check whether an application is exposed?

Verify the running PHP version and review whether the application invokes the OpenSSL extension's AES-WRAP-PAD algorithm. Versions at or above 8.2.32, 8.3.32, 8.4.23, or 8.5.8 for their respective release branches are not listed as affected.

Published Jul 3, 2026

Updated

In PHP versions 8.2. before 8.2.32, 8.3. before 8.3.32, 8.4. before 8.4.23, 8.5. before 8.5.8, the AES-WRAP-PAD algorithm implementation in OpenSSL extension contains a buffer allocation flaw. The output buffer for the AES key-wrap-with-padding operation is sized from the plaintext length without accounting for RFC 5649 expansion. This may cause OpenSSL to write beyond allocated memory, corrupting heap metadata and triggering application abort.

Affected Software

1 affected component

OpenSSL OpenSSL extension for PHP<8.2.32, <8.3.32, <8.4.23, <8.5.8

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 8.2.32
Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 8.3.32
Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 8.4.23
Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 8.5.8

Event History

Jul 3, 2026

Data Sourced

via Red Hat·10:01 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

Which PHP deployments are affected?

Deployments using PHP 8.2 before 8.2.32, 8.3 before 8.3.32, 8.4 before 8.4.23, or 8.5 before 8.5.8 are affected when they use the OpenSSL extension's AES-WRAP-PAD operation.

What must occur for the flaw to be triggered?

An AES key-wrap-with-padding operation using AES-WRAP-PAD must process plaintext whose RFC 5649 output expansion exceeds the buffer allocation derived from the plaintext length. The resulting OpenSSL write can corrupt heap metadata and abort the application.

How can I check whether an application is exposed?

Verify the running PHP version and review whether the application invokes the OpenSSL extension's AES-WRAP-PAD algorithm. Versions at or above 8.2.32, 8.3.32, 8.4.23, or 8.5.8 for their respective release branches are not listed as affected.

REDHAT-BUG-2496971: Medium severity OpenSSL OpenSSL extension for PHP vulnerability

Affected Software

Remediation

Event History

Frequently Asked Questions

Which PHP deployments are affected?

What must occur for the flaw to be triggered?

How can I check whether an application is exposed?

Company

Resources

Contact

Frequently Asked Questions

Which PHP deployments are affected?

What must occur for the flaw to be triggered?

How can I check whether an application is exposed?