CVE-2026-42504High· 7.5▾ TwilightDecoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.
▾ 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 Aug 2.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
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.
mime < 1.25.11mime >= 1.26.0-0 < 1.26.4Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
stdlib >= 1.26.0-0, < 1.26.4Patched in:
stdlib 1.26.4Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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