What is CVE-2026-80231?

CVE-2026-80231 is a high-severity vulnerability in Curl, classified under CWE-488. CVSS score: 7.5/10. Published 2026-09-06.

How severe is CVE-2026-80231?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Curl

CVE-2026-80231

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.

Published 2026-09-06 · last modified 2026-09-15.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.009 (59.2th percentile), scored 2026-10-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: -0.000

Affected products

Curl — versions 8.0.1, 7.84.0, 7.79.1
Haxx Curl

Weakness classification (CWE)

CWE-488

References

2499f714-1537-4658-8207-48ae4bb9eae9 (Vendor Advisory)
2499f714-1537-4658-8207-48ae4bb9eae9 (Patch, Mitigation, Vendor Advisory)
2499f714-1537-4658-8207-48ae4bb9eae9 (Exploit, Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2026-80231?: CVE-2026-80231 is a high-severity vulnerability in Curl, classified under CWE-488. CVSS score: 7.5/10. Published 2026-09-06.
How severe is CVE-2026-80231?: High severity. CVSS v3 base score is 7.5 out of 10.