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RUSTSEC-2026-0391
zstdzstdThe with_context constructors of the stream encoders and decoders used the
borrowed context as it was. When a stream was abandoned on a context, for
example an encoder dropped before finish() after an error, whatever it
left there was carried into the next stream: the input buffered by the
previous encoder (up to 128 KiB, or all of it with zstdmt) became the
start of the next frame, and a decoder returned undelivered output of the
previous stream.
An application reusing one context for data that must stay separate, such as different users' requests, could disclose one user's plaintext to another. Whoever supplies the data can cause the abandonment with invalid input.
The flaw was corrected by resetting the context's session in
with_context.
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Measures severity based on intrinsic characteristics of the vulnerability, independent of environment.
No exploitation activity has been observed at this time. Continue routine monitoring.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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