Loading vulnerability…
CVE-2026-6276 is an origin-validation vulnerability in libcurl versions 7.71.0 through 8.19.0 inclusive. When an application sets a custom Host: header for an HTTP request and subsequently reuses the same easy handle without that header, libcurl retains stale host information used for cookie selection. Consequently, cookies intended for the first host can be sent to a different host in the subsequent request. The curl command-line tool is not affected. The vulnerability is fixed in libcurl 8.20.0.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
23 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A stale host-information vulnerability in libcurl can leak cookies intended for one host to another when an easy handle is reused after removing a custom Host header. The advisory lists exploit availability and recommends updating curl and related packages to version 1:8.14.1-2+deb13u3+e2 or later. Its CVSS v3 score is 7.5 (High), although the listed availability-only impact vector does not align with the cookie-leak description.
A vulnerability referenced by the AlmaLinux local-security-check plugin; no technical vulnerability details are provided.
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.
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.