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CVE-2026-5545 is an authentication-bypass flaw in libcurl connection-pool reuse logic. When an application issues an authenticated HTTP(S) request to a host after a live HTTP Negotiate-authenticated connection to that same host has been established with different credentials, libcurl can incorrectly reuse the existing connection. The subsequent request is transmitted on the connection authenticated as the first user rather than under the credentials requested for the second operation. The issue affects curl and libcurl versions 7.10.6 through 8.19.0 and is fixed in 8.20.0.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
28 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in curl/libcurl addressed by the Huawei EulerOS SA-2026-3408 security advisory; no technical flaw type is provided.
A specific vulnerability addressed by the EulerOS SA-2026-3495 curl/libcurl security update; no technical flaw details are provided.
A referenced vulnerability covered by the Huawei EulerOS advisory affecting curl/libcurl-related packages.
A specific vulnerability listed in a Huawei EulerOS security advisory affecting curl/libcurl packages.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.