Use-after-free with `CParameter::StableInBuffer`

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.

With `CParameter::StableInBuffer(true)` (`experimental` feature), the C library keeps a pointer to the input of one streaming call and reads from it in later calls, including `flush_stream` and `end_stream`, which take no input. An `InBuffer` only borrows its slice for one call, so safe code could free it in between, and freed memory was compressed into the frame. The C library behaves this way since zstd 1.5.4, whether bundled or linked from the system. The flaw was corrected by refusing to enable the parameter.

Source published

16 Oct 2026 12:00:00 UTC

Source modified

26 Oct 2026 14:00:06 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

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.