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CVE-2026-86419

9.1, critical

MISP Exposure of Sensitive Information Vulnerability

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
0.4% higher than 34.4% of scored CVEs
Exploitation
No public evidence
Published
7 Sept 2026a month ago

Description

Affected versions of MISP contain insufficient validation of server-side outbound HTTP destinations in feed retrieval and TAXII discovery functionality. In feed processing, redirects were followed without validating the redirect scheme or destination. The original request headers were reused across redirect hops, meaning authentication headers or API credentials configured for a feed could be forwarded to a different host. Redirects could also target internal network resources, resulting in SSRF. The fix adds redirect validation, blocks internal destinations for cross-host redirects, strips configured feed credentials before following redirects to another host, and pins validated DNS results to prevent re-resolution after validation. The TAXII discovery endpoint had a related incomplete SSRF defense. It used gethostbyname() and compared the result against only a few literal addresses. This missed cases including IPv6 loopback (::1), numeric host encodings such as 0x7f000001, and potentially multiple DNS records. The fix moves TAXII discovery to the shared URL egress validator. Together, these commits harden MISP's outbound URL handling against alternate-address representations, DNS-related bypasses, unsafe redirects, internal-host access, and cross-host credential forwarding. Version affected: ≤2.5.45

Details

Vendor
MISP
Product
MISP
Weakness
CWE-200 (opens in a new tab)
Status
Analyzed
Updated
9 Sept 2026
Assigner
5a6e4751-2f3f-4070-9419-94fb35b644e8

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

References 2

Patches and fixes 2

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-2026-86452 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-2026-85221 MISP contains an improper TLS certificate validation vulnerability in CurlClient EPSS 0.3% 9.1, 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-2026-86419 in your network?

This page tells you how dangerous CVE-2026-86419 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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    Detect it if it's exploited

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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.