How severe is CVE-2026-47070?

CVE-2026-47070 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-47070 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-47070?

CVE-2026-47070 affects Benoitc Hackney. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-47070?

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

Does CVE-2026-47070 have an EU (EUVD) identifier?

Yes. CVE-2026-47070 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31692.

When was CVE-2026-47070 published?

CVE-2026-47070 was published on 2026-05-25 and last updated on 2026-06-17.

CVE-2026-47070

CVE-2026-47070 is a medium-severity vulnerability in Benoitc Hackney with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-601.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 6.0
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31692
Weakness: CWE-601
Affected product: Benoitc Hackney
Published: 2026-05-25
Last modified: 2026-06-17

Description

Sensitive Data Exposure vulnerability in benoitc hackney allows Retrieve Embedded Sensitive Data. The HTTP/3 redirect handler in src/hackney_h3.erl passes the original request headers unchanged to the redirect target without performing any cross-origin check. When a client issues an HTTP/3 request with follow_redirect enabled and includes Authorization or Cookie headers, a server responding with a 3xx redirect to a different host will cause the client to forward those credentials verbatim to the new origin. The main hackney.erl module has maybe_strip_auth_on_redirect/2 (guarded by the location_trusted option) to address CVE-2018-1000007, but hackney_h3.erl is missing this protection entirely. This issue affects hackney: from 3.1.1 before 4.0.1.

Frequently asked questions

What is CVE-2026-47070?: Sensitive Data Exposure vulnerability in benoitc hackney allows Retrieve Embedded Sensitive Data. The HTTP/3 redirect handler in src/hackney_h3.erl passes the original request headers unchanged to the redirect target without performing any cross-origin check. When a client issues an HTTP/3 request with follow_redirect enabled and includes Authorization or Cookie headers, a server responding with a 3xx redirect to a different host will cause the client to forward those credentials verbatim to the new origin. The main hackney.erl module has maybe_strip_auth_on_redirect/2 (guarded by the location_trusted option) to address CVE-2018-1000007, but hackney_h3.erl is missing this protection entirely. This issue affects hackney: from 3.1.1 before 4.0.1.
How severe is CVE-2026-47070?: CVE-2026-47070 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-47070 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-47070?: CVE-2026-47070 affects Benoitc Hackney. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-47070?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-47070 have an EU (EUVD) identifier?: Yes. CVE-2026-47070 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31692.
When was CVE-2026-47070 published?: CVE-2026-47070 was published on 2026-05-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*

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