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CVE-2026-61813ModSecurity: Incorrect libcurl TLS hostname verification setting in HttpsClient::download
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.
3.7 LOWEPSS 0.15%Not in KEVNVD: Received
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 3.7 | LOW | 3.1GitHub_M (CNA) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |
Details
- CVE ID
- CVE-2026-61813
- Status
- Received
- Assigner (CNA)
- GitHub_M
- Published
- Nov 5, 2026
- Last modified
- 2026-11-05 16:17 UTC
- Weaknesses
- CWE-295 · Improper Certificate Validation
Affected Products
As published by the CNA in the CVE record.
owasp-modsecurityModSecurity2 version ranges
- < 2.9.15
- >= 3.0.0, < 3.0.17
References
- github.com https://github.com/owasp-modsecurity/ModSecurity/commit/cce204806430e4848327aadeb9113e654631a0c1
- github.com https://github.com/owasp-modsecurity/ModSecurity/commit/edca70d853bfb725325137fa40d178beebc324fc
- github.com https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v2.9.15
- github.com https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.17
- github.com https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-2vqc-36qp-ccmw