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RUSTSEC-2026-0393
zstdZDICT_trainFromBuffer is never told the length of the samples buffer.
Before 0.4.10, zstd::dict::from_continuous (initially train_dict) called
it directly: up to 0.2.1 without checking the sample sizes against the
buffer at all, and from 0.3.0 with a sum that wraps around when overflow
checks are off, as in release builds. Sizes that do not describe the buffer
made the trainer read past its end.
This requires the sample sizes to come from an untrusted source. From 0.4.10, training goes through zstd-safe, where the same flaw is covered by the zstd-safe advisory for it, fixed in zstd-safe 8.2.0.
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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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