CVE-2026-8458

Description

libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate-authenticated ones, even when they are set to use different "services". libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different services.

Why is this CVE low priority?

Upstream defined this as low severity

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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	Not affected
	14.04 LTS trusty	Not affected

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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: 5e99b73

References

Related Ubuntu Security Notices (USN)

USN-8487-1
curl vulnerabilities
30 June 2026