CVE-2026-8458 Affecting curl package, versions <7.58.0-2ubuntu3.24+esm9
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1804-CURL-17487013
- published25 Jun 2026
- disclosed3 Jul 2026
Introduced: 25 Jun 2026
NewCVE-2026-8458 (opens in a new tab)How to fix?
Upgrade Ubuntu:18.04 curl to version 7.58.0-2ubuntu3.24+esm9 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Ubuntu.
See How to fix? for Ubuntu:18.04 relevant fixed versions and status.
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.