No exploitation reportedFix available

CVE-2026-6429

Q: Is CVE-2026-6429 actively exploited?

Active exploitation of CVE-2026-6429 has not been confirmed. Its EPSS score was 0.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2026-6429?

CVE-2026-6429 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.

No exploitation reported by the sources we read.

Published2026-05-13
Fixed in8.20.0
WeaknessCWE-200

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2026-05-1313:01CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-6429?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-6429?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Haxx curl

Branch	Affected	Fixed in	Source
8.20	≥ 7.14.0, < 8.20.0	8.20.0	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

libcurlAlmaLinux:10all versions · fixed in 8.12.1-4.el10_2.7and 3 other packages

Vendor advisories

CVE-2026-6429 Red Hat Product Security59 products fixed · 40 known affected
curl: libcurl: Credential leak via reused proxy connection during HTTP redirects
build-of-trustee/trustee-rhel9 as a component of Confidential Compute Attestation · confidential-compute-attestation-tech-preview/trustee-rhel9 as a component of Confidential Compute Attestation · openshift-sandboxed-containers/osc-operator-bundle as a component of Confidential Compute Attestation · +37 more
RHSA-2026:87400 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat Cost Management On-Premise container image update
RHSA-2026:80512 Red Hat Product Security49 products fixed
Red Hat Security Advisory: curl security update
RHSA-2026:12916 Red Hat Product Security9 products fixed
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Full record on NVD

Fix

Update Haxx curl to 8.20.0
Vendor fix Red Hat Product Security RHSA-2026:87400 · 1 productThe container image provided by this update can be downloaded from the Red Hat container registry at registry.redhat.io using the "podman pull" command.
Vendor fix Red Hat Product Security RHSA-2026:80512 · 49 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Vendor fix Red Hat Product Security RHSA-2026:12916 · 9 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
Workaround from the vendor Red Hat Product Security RHSA-2026:87400 · 1 productTo prevent the credential leak, avoid using the combination of .netrc for credentials, clear text HTTP URLs, and an HTTP proxy when making requests with libcurl. This operational control prevents the specific conditions that enable the vulnerability.
No fix available, says the vendor Red Hat Product Security CVE-2026-6429 · 32 productsFix deferred
No fix available, says the vendor Red Hat Product Security CVE-2026-6429 · 8 productsAffected

Advisories and patches

curl.sePatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionnone2026-05-13
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.15.32026-05-13
CNAweakness (CWE)CWE-200read 2026-10-23
FIRST EPSSEPSS score0.5 %2026-10-23
OSVaffected packages—
Microsoft MSRCadvisory—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Published: 2026-05-13
Last Modified: 2026-09-15
NVD status: Modified
MSRC Title: netrc credential leak with reused proxy connection

Frequently asked questions

What is CVE-2026-6429?

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.

Is CVE-2026-6429 actively exploited?

Active exploitation of CVE-2026-6429 has not been confirmed. Its EPSS score was 0.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

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

CVE-2026-6429 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.

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