CVE-2026-8927

Publication date 24 June 2026

Last updated 2 July 2026

Ubuntu priority

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`.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
curl	26.04 LTS resolute	Fixed 8.18.0-1ubuntu2.2
	25.10 questing	Fixed 8.14.1-2ubuntu1.4
	24.04 LTS noble	Fixed 8.5.0-2ubuntu10.10
	22.04 LTS jammy	Fixed 7.81.0-1ubuntu1.25
	20.04 LTS focal	Fixed 7.68.0-1ubuntu2.25+esm4
	18.04 LTS bionic	Fixed 7.58.0-2ubuntu3.24+esm9
	16.04 LTS xenial	Fixed 7.47.0-1ubuntu2.19+esm16
	14.04 LTS trusty	Fixed 7.35.0-1ubuntu2.20+esm20

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
curl	Upstream: 5c22538

References

Related Ubuntu Security Notices (USN)

USN-8487-1
curl vulnerabilities
30 June 2026