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CVE-2026-58044 is an HTTP request desynchronization vulnerability in the Node.js HTTP client affecting supported Node.js 22.x, 24.x, and 26.x release lines. When the configured header-count limit is exceeded, Node.js can omit surplus headers from the userland IncomingMessage header representations, including req.headers, req.rawHeaders, and req.headersDistinct, while continuing to use the omitted headers internally for HTTP message framing. A Content-Length header can therefore be invisible to proxy code even as Node.js delivers the corresponding request body. Node.js-based forwarding proxies that reconstruct outbound headers from the visible header set while piping the original body over a reused backend connection can emit requests whose forwarded framing differs from the framing interpreted by Node.js.
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What an attacker gets, and what they’ve been doing with it.
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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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Node.js vulnerability included in the Alpine nodejs-current 26.5.1-r0 security update; no technical details are provided.
A Node.js HTTP parsing vulnerability involving header truncation that could enable request smuggling in Node.js-based forwarding proxies.
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.