HighGHSA-2qh5-382h-3jpcCVE-2026-77634

CakePHP: SmtpTransport vulnerable to CRLF header injection

Published 8 Sept 2026 · Updated 8 Sept 2026

Affected packages

cakephp/cakephpComposer

Affected: >=4.5.0 <4.5.12
Fixed in: 4.5.12

Update to the fixed version for your release line, for example:composer require cakephp/cakephp:^4.5.12

cakephp/cakephpComposer

Affected: >=4.6.0 <4.6.5
Fixed in: 4.6.5

Update to the fixed version for your release line, for example:composer require cakephp/cakephp:^4.6.5

cakephp/cakephpComposer

Affected: >=5.0.0 <5.1.9
Fixed in: 5.1.9

Update to the fixed version for your release line, for example:composer require cakephp/cakephp:^5.1.9

cakephp/cakephpComposer

Affected: >=5.2.0 <5.2.14
Fixed in: 5.2.14

Update to the fixed version for your release line, for example:composer require cakephp/cakephp:^5.2.14

cakephp/cakephpComposer

Affected: >=5.3.0 <5.3.7
Fixed in: 5.3.7

Update to the fixed version for your release line, for example:composer require cakephp/cakephp:^5.3.7

Details

Impact

Custom mail headers added with Message::setHeaders() or addHeaders() do not have CRLF replaced allowing header injection if user controlled data is added to message headers without stripping CRLF bytes.

Patches

5.3.7, 5.2.14, 5.1.9, 4.6.5, 4.5.12 contain fixes for this issue.

Workarounds

You can strip CRLF bytes from email header values before setting header values.

Is GHSA-2qh5-382h-3jpc in any of your client repos?

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References

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.