PatchTheCVECVE-2026-85221: MISP contains an improper TLS certificate validation vulnerability in CurlClient
CVE-2026-85221 is a critical-severity flaw (CVSS 9.1) affecting misp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
MISP contains an improper TLS certificate validation vulnerability in CurlClient. The CurlClient::$verifyPeer property was not explicitly initialized and therefore defaulted to null. When passed to cURL, this value effectively disabled TLS peer verification unless the calling code explicitly enabled it. As a result, HTTPS connections made through affected CurlClient instances could accept certificates that were not issued by a trusted certifica
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.1 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 80%) |
| CISA exploited list | No |
| Weakness | CWE-295 |
| Published | 2026-09-03 |
| Last modified | 2026-09-10 |
Last updated 2026-09-10 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-85221?
misp: upgrade to 2.5.46. Exact commands for each OS are on this page.
Is CVE-2026-85221 being exploited?
CVE-2026-85221 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-85221 affect?
CVE-2026-85221 affects misp. Severity is critical (CVSS 9.1). MISP contains an improper TLS certificate validation vulnerability in CurlClient. The CurlClient::$verifyPeer property was not explicitly initialized and therefore defaulted to null. When passed to cURL, this value effectively disabled TLS
How urgent is CVE-2026-85221?
Priority 42/100. Critical severity; Remotely exploitable, no login, no user action
Software pages
Related CVEs
- CVE-2026-85239 MEDIUM 6.5 UPGRADE A vulnerability in MISP's event template handling allowed an authenticated user with permission to create or m
- CVE-2026-85238 MEDIUM 6.8 UPGRADE MISP contains a session fixation vulnerability in the CustomAuth authentication (a custom configuration) flow
- CVE-2026-85237 HIGH 8.1 UPGRADE A vulnerability in MISP's email-based one-time password (OTP) authentication flow allowed an attacker to perfo
- CVE-2026-85236 HIGH 8.8 UPGRADE A cross-site request forgery (CSRF) vulnerability existed in the cullEmptyEvents action of MISP
- CVE-2026-85216 CRITICAL 9.8 UPGRADE MISP contains an authentication bypass vulnerability in its LDAP and LinOTP authentication components due to i