CVE-2026-57210 is an IP spoofing vulnerability in Heimdall caused by insufficient validation of client-supplied Forwarded and X-Forwarded-For headers when trusted_proxies is configured. Under affected configurations, malformed or attacker-controlled header values can be accepted into client IP address handling and used to populate Request.ClientIPAddresses. This can influence rule evaluation that relies on client IP information and, in proxy mode, can also cause spoofed or malformed client IP data to be propagated to upstream services.
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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.
No public activity tracked yet. Mallory keeps watching.
No public activity observed for this vulnerability.
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.
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