Out-of-bounds read with an out-of-range `InBuffer::pos`

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.

`InBuffer`'s fields are public, so safe code can set `pos` past the end of `src`. The position was passed to the C library unchecked, and `ZSTD_seekable_compressStream`, unlike the other streaming functions, does not validate it: it read past the end of the input slice, by up to the frame size, and compressed that memory into the output. The flaw was corrected by checking the position before every call into the C library.

Source published

16 Oct 2026 12:00:00 UTC

Source modified

26 Oct 2026 14:00:05 UTC

Observed here

26 Oct 2026 14:35:44 UTC

Source terms

OSV · upstream source license applies

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

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