November 15, 2026

CVE Watchtower

CVE-2026-8925Haxx Curl Double Free

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

Vulnerability Summary

The curl logic that works with SASL authentication could end up cleaning up
the GSASL context *twice* without clearing the pointer in between, making it
`free()` the same pointer twice.
Severity Level
CRITICAL(9.8)
Published Date
Jul 3, 2026
Last Modified
Jul 7, 2026
Exploitation Status
Public exploit available
EPSS Score (30-Day)
0.59%Probability
Root Weakness (CWE)
CWE-415: Double Free β†—
The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations.
CVSS v3.1 Base Metrics — Score 9.8 (CRITICAL)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Haxx Curl >= 8.15.0 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.

Get notified about new Haxx Curl CVEsYou are reading CVE-2026-8925. Get an email when KEV listings, exploits or new CVEs match your stack.
Set up CVE alerts

Related Coverage

External References

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