CVE-2026-9080 UAF after pause in socket callback
A use-after-free in libcurl allows attackers to execute arbitrary code or cause denial of service via socket callback pausing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-9080?
CVE-2026-9080 is a high-severity use after free vulnerability in Haxx Curl, published on 3 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-416
Which versions are affected by CVE-2026-9080?
It affects 1 product.
Products include Haxx Curl.
How do I fix CVE-2026-9080?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-9080 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-9080 exists.
Other vulnerabilities in Haxx Curl
Sources
Also known as ALPINE-CVE-2026-9080, BELL-CVE-2026-9080, CURL-CVE-2026-9080, DEBIAN-CVE-2026-9080, ECHO-32df-c979-b5c3, GHSA-hf34-v47h-w6m3 and 8 more.