CVE-2026-42504High· 7.5▾ TwilightQuadratic complexity in WordDecoder.DecodeHeader in mime
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the CISA ADP record, not NVD.
Exploit-prediction probability, daily snapshots since Jul 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
0.6%
7.5 → —
high → none
— → 7.5
none → high
7.5 → —
high → none
— → 7.5
none → high
7.5 → —
high → none
— → 7.5
none → high
Last analysed / modified upstream
Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.
stdlib >= 1.26.0-0, < 1.26.4Upgrade to a patched release:
stdlib 1.26.4Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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