OWASP ModSecurity up to 2.9.14/3.0.16 Https Client Download https_client.cc HttpsClient::download certificate validation

Summaryinfo

A vulnerability categorized as problematic has been discovered in OWASP ModSecurity ModSecurity up to 2.9.14/3.0.16. Impacted is the function HttpsClient::download of the file src/utils/https_client.cc of the component Https Client Download. The manipulation results in certificate validation. This vulnerability is reported as CVE-2026-61813. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in OWASP ModSecurity ModSecurity up to 2.9.14/3.0.16. It has been classified as problematic. Affected is the function HttpsClient::download of the file src/utils/https_client.cc of the component Https Client Download. The manipulation with an unknown input leads to a certificate validation vulnerability. CWE is classifying the issue as CWE-295. The product does not validate, or incorrectly validates, a certificate. This is going to have an impact on integrity. CVE summarizes:

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Prior to 2.9.15 and 3.0.17, the HttpsClient::download function in src/utils/https_client.cc sets libcurl CURLOPT_SSL_VERIFYHOST to 1 instead of the strict value 2L. Under adversary-in-the-middle and TLS interception conditions, this non-strict setting may weaken TLS peer identity validation and increase the risk of accepting a certificate for an unintended host. End-to-end exploitation is non-trivial in typical environments. This issue is fixed in versions 2.9.15 and 3.0.17.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-61813 since 07/10/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1587.003 by the MITRE ATT&CK project.

Upgrading to version 2.9.15 or 3.0.17 eliminates this vulnerability.

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Productinfo

Vendor

• OWASP ModSecurity

Name

• ModSecurity

Version

• 2.9.0
• 2.9.1
• 2.9.2
• 2.9.3
• 2.9.4
• 2.9.5
• 2.9.6
• 2.9.7
• 2.9.8
• 2.9.9
• 2.9.10
• 2.9.11
• 2.9.12
• 2.9.13
• 2.9.14
• 3.0.0
• 3.0.1
• 3.0.2
• 3.0.3
• 3.0.4
• 3.0.5
• 3.0.6
• 3.0.7
• 3.0.8
• 3.0.9
• 3.0.10
• 3.0.11
• 3.0.12
• 3.0.13
• 3.0.14
• 3.0.15
• 3.0.16

License

• open-source

CPE 2.3info

• 🔒
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CPE 2.2info

• 🔒
• 🔒
• 🔒

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