CVE-2026-8458 | libcurl might in some circumstances reuse the wrong connecti…

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.

Metadata

CVE ID: CVE-2026-8458
State: PUBLISHED
Assigner: curl
Reserved: 2026-05-13 08:33 UTC
Published: 2026-07-03 06:14 UTC
Last updated: 2026-07-03 06:14 UTC
Vendor / Product: curl / curl
Sources: cve.org · NVD

Severity & Metrics

No CVSS data available.

Affected products (1)

Vendor	Product	Platform	Versions
curl	curl	—	8.20.0 ≤ 8.20.0, 8.19.0 ≤ 8.19.0, 8.18.0 ≤ 8.18.0, 8.17.0 ≤ 8.17.0 …

Weakness (CWE)

CWE	Source	Description
—	cna	CWE-488 Exposure of Data Element to Wrong Session

References (3)