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Fencer Vulns
low 3.7

CVE-2026-61813 json

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

published 2026-11-05 3 d ago modified 2026-11-05 3 d ago also EUVD-2026-117553

cvss
3.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

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.

Patch / fix

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-61813 updated cvss 3.7

mod_security: modsecurity: ModSecurity: Weak TLS certificate validation via improper hostname verification

  • Red Hat Enterprise Linux 7 mod_security-mlogc, mod_security 2.9.14-1.el10 Red Hat Enterprise Linux 8 mod_security, mod_security-mlogc, mod_security 2.9.14-1.el10 Red Hat Enterprise Linux 9 mod_security, mod_security-mlogc, mod_security 2.9.14-1.el10 Red Hat Enterprise Linux 10 mod_security 2.9.14-1.el10 Red Hat JBoss Core Services jbcs-httpd24-mod_security, jbcs-httpd24-mod_security-src-zip
    under investigation

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

  • owasp-modsecurity ModSecurity

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.