November 15, 2026

CVE Watchtower

CVE-2026-9080Haxx Curl Use After Free

NVDCVSS scored by 134c704f-9b21-4f2e-91b3-4a467353bcc0

Vulnerability Summary

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.
Severity Level
HIGH(7.3)
Published Date
Jul 3, 2026
Last Modified
Jul 7, 2026
Exploitation Status
Public exploit available
EPSS Score (30-Day)
0.30%Probability
Root Weakness (CWE)
CWE-416: Use After Free β†—
The product reuses or references memory after it has been freed, which can cause a crash or execution of arbitrary code.
CVSS v3.1 Base Metrics — Score 7.3 (HIGH)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityLow
IntegrityLow
AvailabilityLow

Affected & Patched Versions

Affected Versions
  • Haxx Curl >= 8.13.0 and < 8.21.0
Patched Versions
  • Haxx Curl 8.21.0

What to do

Prioritize this fix. Exploit code is public, so attacks can follow quickly.

  1. Check whether you run Haxx Curl and which version.
  2. Update to a patched version listed above, then confirm the new version.
  3. Review logs and exposed services for signs of earlier compromise.

Timeline

  • Jul 3, 2026Published
  • Jul 7, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

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Related Coverage

External References

Data last checked: Nov 15, 2026 03:31 UTC