Quadratic complexity in WordDecoder.DecodeHeader in mime

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.

Source published

02 Jun 2026 22:01:37 UTC

Source modified

24 Oct 2026 10:23:22 UTC

Observed here

24 Oct 2026 11:27:26 UTC

Source terms

CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.

Source published

02 Jun 2026 21:39:47 UTC

Source modified

20 Oct 2026 10:42:25 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.