What is CVE-2026-9080?

CVE-2026-9080 is a high-severity vulnerability in Curl, classified under Use After Free. CVSS score: 7.3/10. Published 2026-07-03.

How severe is CVE-2026-9080?

High severity. CVSS v3 base score is 7.3 out of 10.

Use After Free in Curl

CVE-2026-9080

Calling `curl_easy_pause()` within the event-based `CURLMOPT_SOCKETFUNCTION` callback triggers a use-after-free vulnerability, where libcurl attempts to store a flag using a dangling struct pointer immediately after that pointer's memory has been freed.

Vulnerability class: Use-After-Free

Published 2026-07-03 · last modified 2026-09-15.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.005 (40.4th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002

Affected products

Curl — versions 8.20.0, 8.19.0, 8.18.0
Haxx Curl

Weakness classification (CWE)

CWE-416 — Use After Free

References

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

Frequently asked questions

What is CVE-2026-9080?: CVE-2026-9080 is a high-severity vulnerability in Curl, classified under Use After Free. CVSS score: 7.3/10. Published 2026-07-03.
How severe is CVE-2026-9080?: High severity. CVSS v3 base score is 7.3 out of 10.