Is CVE-2026-6429 in the CISA KEV catalog?

No. CVE-2026-6429 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-6429?

CVE-2026-6429 has a CVSS v3 base score of 5.3 (Moderate).

What is the EPSS score for CVE-2026-6429?

CVE-2026-6429 has an EPSS score of 0.52% (40th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-6429?

Upgrade curl on debian unstable to 8.20.0~rc3-1 or later. Fixes are available for 9 affected products.

CVE & CISA-KEV Catalog

CVE-2026-6429

MEDIUM

5.3

CVSS v3

NVD

Description

When asked to both use a `.netrc` file for credentials and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to host under certain circumstances.

How to fix

Remediation Available

curlDebian

Fixed in:8.20.0~rc3-1CVE-2026-6429

curlRocky

Fixed in:main@x86_64RHSA-2026:12916

Fixed in:main@aarch64RHSA-2026:12916

Fixed in:main@srcRHSA-2026:12916

curlRed Hat / RHEL

Fixed in:main@aarch64RHSA-2026:12916

Fixed in:main@srcRHSA-2026:12916

Fixed in:main@x86_64RHSA-2026:12916

curlUbuntu

Fixed in:7.81.0-1ubuntu1.24USN-8227-1

Fixed in:8.5.0-2ubuntu10.9USN-8227-1

Fixed in:8.14.1-2ubuntu1.3USN-8227-1

libcurl3-gnutlsUbuntu

Fixed in:7.81.0-1ubuntu1.24USN-8227-1

libcurl3-nssUbuntu

Fixed in:7.81.0-1ubuntu1.24USN-8227-1

libcurl3t64-gnutlsUbuntu

Fixed in:8.5.0-2ubuntu10.9USN-8227-1

Fixed in:8.14.1-2ubuntu1.3USN-8227-1

libcurl4Ubuntu

Fixed in:7.81.0-1ubuntu1.24USN-8227-1

libcurl4t64Ubuntu

Fixed in:8.5.0-2ubuntu10.9USN-8227-1

Fixed in:8.14.1-2ubuntu1.3USN-8227-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U

Exploit Intelligence

0.52%probability of exploitation in 30 days

40thpercentile

Moderate risk: more likely to be exploited than 40% of all known CVEs.

References

Patch1

curl.se

Exploit1

hackerone.com

Product1

curl.se

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-14.