How severe is CVE-2026-6429?

CVE-2026-6429 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-6429 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-6429?

CVE-2026-6429 affects Haxx Curl. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-6429?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-6429 have an EU (EUVD) identifier?

Yes. CVE-2026-6429 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29930.

When was CVE-2026-6429 published?

CVE-2026-6429 was published on 2026-05-13 and last updated on 2026-06-17.

CVE-2026-6429

CVE-2026-6429 is a medium-severity vulnerability in Haxx Curl with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29930
Affected product: Haxx Curl
Published: 2026-05-13
Last modified: 2026-06-17

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.

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.
How severe is CVE-2026-6429?: CVE-2026-6429 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-6429 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-6429?: CVE-2026-6429 affects Haxx Curl. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-6429?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-6429 have an EU (EUVD) identifier?: Yes. CVE-2026-6429 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29930.
When was CVE-2026-6429 published?: CVE-2026-6429 was published on 2026-05-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

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