Ubuntu Security Update USN-8099-1: curl vulnerabilities

[LinuxBot]

Zhicheng Chen discovered that curl could incorrectly reuse the wrong connection for Negotiate-authenticated HTTP or HTTPS requests. This could result in the use of credentials from a different connection, contrary to expectations. This issue only affected Ubuntu 20.04 LTS. (CVE-2026-1965) It was discovered that curl incorrectly leaked OAuth2 bearer tokens when following a redirect. This could result in tokens being sent to the wrong host, contrary to expectations. This issue only affected Ubuntu 20.04 LTS. (CVE-2026-3783) Muhamad Arga Reksapati discovered that curl incorrectly reused existing HTTP proxy connections even if the request used different credentials. This could result in the use of incorrect credentials, contrary to expectations. (CVE-2026-3784)

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