Description
When reusing a libcurl handle for sequential transfers driven by
environment-variable proxy configuration, libcurl fails to clear the proxy
authentication state between requests. Specifically, if the initial transfer
authenticates against `proxyA` using Digest auth, a subsequent transfer routed
through `proxyB` erroneously leaks the `Proxy-Authorization:` header intended
solely for `proxyA`.
Published: 2026-07-03
Score: n/a
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
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Remediation

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Advisories
Source ID Title
Ubuntu USN Ubuntu USN USN-8487-1 curl vulnerabilities
History

Fri, 03 Jul 2026 06:45:00 +0000

Type Values Removed Values Added
Description When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy authentication state between requests. Specifically, if the initial transfer authenticates against `proxyA` using Digest auth, a subsequent transfer routed through `proxyB` erroneously leaks the `Proxy-Authorization:` header intended solely for `proxyA`.
Title env-set cross-proxy Digest auth state leak
References

Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: curl

Published:

Updated: 2026-07-03T06:16:06.376Z

Reserved: 2026-05-19T08:12:08.842Z

Link: CVE-2026-8927

cve-icon Vulnrichment

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cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses

No weakness.