Mojolicious up to 9.46 Mojo/JSON.pm decode_json/from_json/j recursion

Summaryinfo

A vulnerability categorized as problematic has been discovered in Mojolicious up to 9.46. Affected is the function decode_json/from_json/j of the file Mojo/JSON.pm. The manipulation results in recursion. This vulnerability is cataloged as CVE-2026-68914. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Mojolicious up to 9.46. Affected is the function decode_json/from_json/j of the file Mojo/JSON.pm. The manipulation with an unknown input leads to a recursion vulnerability. CWE is classifying the issue as CWE-674. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. This is going to have an impact on availability. CVE summarizes:

Mojolicious is a real-time web framework for Perl. Prior to 9.47, the pure-Perl implementation of Mojo::JSON does not limit nesting depth when Cpanel::JSON::XS is unavailable or MOJO_NO_JSON_XS is enabled. An attacker who can supply untrusted JSON to decode_json, from_json, or j can submit deeply nested arrays or objects, causing unbounded recursion, memory exhaustion, and a process crash. Applications using the Cpanel::JSON::XS backend are not affected because that backend already enforces a nesting limit. This issue is fixed in version 9.47.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-68914 since 07/31/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 9.47 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• Mojolicious

Version

• 9.0
• 9.1
• 9.2
• 9.3
• 9.4
• 9.5
• 9.6
• 9.7
• 9.8
• 9.9
• 9.10
• 9.11
• 9.12
• 9.13
• 9.14
• 9.15
• 9.16
• 9.17
• 9.18
• 9.19
• 9.20
• 9.21
• 9.22
• 9.23
• 9.24
• 9.25
• 9.26
• 9.27
• 9.28
• 9.29
• 9.30
• 9.31
• 9.32
• 9.33
• 9.34
• 9.35
• 9.36
• 9.37
• 9.38
• 9.39
• 9.40
• 9.41
• 9.42
• 9.43
• 9.44
• 9.45
• 9.46

CPE 2.3info

• 🔒
• 🔒
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CPE 2.2info

• 🔒
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Once again VulDB remains the best source for vulnerability data.

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