CVE-2026-80231 native CA store conn reuse

High 7.5 Published 6 Sep 2026 Updated 15 Sep 2026

Attackers can bypass native CA store security settings by reusing existing HTTPS connections, potentially allowing untrusted certificate validation.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-80231?

CVE-2026-80231 is a high-severity vulnerability in Haxx Curl, published on 6 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A flaw in libcurl makes it wrongly reuse an existing HTTPS connection setup for a given hostname even when using a different Native CA Store setting (`CURLSSLOPT_NATIVE_CA`) than when the connection was created.

Weakness: CWE-488

Which versions are affected by CVE-2026-80231?

It affects 1 product.

Products include Haxx Curl.

How do I fix CVE-2026-80231?

Apply the vendor's patch.

Is CVE-2026-80231 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-80231 exists.

All Haxx Curl vulnerabilities

Sources

Also known as ALPINE-CVE-2026-80231, AZL-99758, AZL-99774, AZL-99807, AZL-99831, AZL-99855 and 10 more.