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CVE-2026-85221

9.1, critical

MISP contains an improper TLS certificate validation vulnerability in CurlClient

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
9.1, critical critical CVSS v3.1
EPSS, next 30 days
0.3% higher than 18.4% of scored CVEs
Exploitation
No public evidence
Published
3 Sept 2026a month ago

Description

MISP contains an improper TLS certificate validation vulnerability in CurlClient. The CurlClient::$verifyPeer property was not explicitly initialized and therefore defaulted to null. When passed to cURL, this value effectively disabled TLS peer verification unless the calling code explicitly enabled it. As a result, HTTPS connections made through affected CurlClient instances could accept certificates that were not issued by a trusted certificate authority. An attacker capable of intercepting or manipulating network traffic between a MISP instance and a remote HTTPS service could impersonate the remote endpoint and perform a man-in-the-middle attack. Successful exploitation could allow an attacker to observe sensitive information transmitted by MISP, including authentication material or exchanged threat intelligence, and to modify responses returned to the MISP instance. The impact depends on the functionality using CurlClient and the data exchanged with the remote service. The patch enables TLS peer verification by default while preserving explicit support for configured self-signed certificates. It also corrects the self-signed certificate handling in SyncTool so that peer verification is disabled only when no pinned CA certificate is configured.

Details

Vendor
Misp
Product
misp
Weakness
CWE-295 (opens in a new tab)
Status
Analyzed
Updated
10 Sept 2026
Assigner
5a6e4751-2f3f-4070-9419-94fb35b644e8

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

References 1

Patches and fixes 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Misp CVEs

Every Misp CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-86419 MISP Exposure of Sensitive Information Vulnerability EPSS 0.4% 9.1, critical
  • CVE-2026-86452 MISP Uncontrolled Resource Consumption Vulnerability EPSS 0.5% 7.5, high
  • CVE-2026-85216 MISP contains an authentication bypass vulnerability in its LDAP and LinOTP authentication components due to insufficient validation of… EPSS 0.9% 9.8, critical
  • CVE-2026-85236 misp Cross-Site Request Forgery Vulnerability EPSS 0.3% 8.8, high
  • CVE-2026-85237 A vulnerability in MISP's email-based one-time password (OTP) authentication flow allowed an attacker to perform an unrestricted number… EPSS 0.5% 8.1, high

Beyond this page

Is CVE-2026-85221 in your network?

This page tells you how dangerous CVE-2026-85221 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-85221 comes with the devices to patch.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.