ModSecurity: Incorrect libcurl TLS hostname verification setting in HttpsClient::download

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-61813
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-05 16:17:47 UTC
Updated2026-11-09 17:17:31 UTC
DescriptionModSecurity 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.

Risk And Classification

Primary CVSS: v3.1 3.7 LOW from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.001550000 probability, percentile 0.046040000 (date 2026-11-09)

Problem Types: CWE-295 | CWE-295 CWE-295: Improper Certificate Validation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Owasp-modsecurity ModSecurity affected < 2.9.15 Not specified
CNA Owasp-modsecurity ModSecurity affected >= 3.0.0, < 3.0.17 Not specified

References

ReferenceSourceLinkTags
github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.17 [email protected] github.com
github.com/owasp-modsecurity/ModSecurity/releases/tag/v2.9.15 [email protected] github.com
github.com/owasp-modsecurity/ModSecurity/commit/edca70d853bfb725325137fa... [email protected] github.com
github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-2vqc-3... [email protected] github.com
github.com/owasp-modsecurity/ModSecurity/commit/cce204806430e4848327aade... [email protected] github.com
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