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CVE-2026-42504 is an algorithmic-complexity denial-of-service vulnerability in the Go standard library's mime.WordDecoder.DecodeHeader function. When decoding an invalid RFC 2047 encoded-word fails, the function preserves undecoded input, consumes and emits the initial encoded-word marker, then resumes parsing. A MIME header constructed from numerous invalid encoded-word prefixes followed by a terminating encoded-word marker causes quadratic or near-quadratic parsing behavior and excessive CPU consumption.
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No public exploit code observed for this vulnerability.
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32 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability addressed by the Oracle Linux 8 grafana-pcp security update ELSA-2026-631240; the content does not specify its technical flaw type.
A Go MIME handling denial-of-service vulnerability triggered by a maliciously crafted MIME header, affecting the grafana-pcp package distributed for Red Hat Enterprise Linux 8.
A Go MIME package denial-of-service vulnerability triggered by a maliciously crafted MIME header. It affects the grafana-pcp package installed on Red Hat Enterprise Linux 10.
A vulnerability addressed by Oracle Linux advisory ELSA-2026-631190 for grafana-pcp on Oracle Linux 10; no technical flaw details are supplied.
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.