November 15, 2026

CVE Watchtower

CVE-2026-9079Haxx Curl Insufficiently Protected Credentials

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

Vulnerability Summary

libcurl had a flaw that when instructed to clear proxy authentication
credentials which made it not do so, leaving the old credentials around to get
used for subsequent transfers that should not know nor use them.
Severity Level
CRITICAL(9.8)
Published Date
Jul 3, 2026
Last Modified
Jul 7, 2026
Exploitation Status
Public exploit available
EPSS Score (30-Day)
0.58%Probability
Root Weakness (CWE)
CWE-522: Insufficiently Protected Credentials β†—
The product transmits or stores authentication credentials using an insecure method that is susceptible to unauthorized interception or retrieval.
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 >= 8.8.0 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