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Add chrono advisory for chrono#499 (localtime_r) #1082

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Oct 18, 2021
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Add chrono advisory for chrono#499 (localtime_r) #1082

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27 changes: 27 additions & 0 deletions crates/chrono/RUSTSEC-0000-0000.md
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```toml
[advisory]
id = "RUSTSEC-0000-0000"
package = "chrono"
date = "2020-11-10"
url = "https:/chronotope/chrono/issues/499"
categories = ["code-execution", "memory-corruption"]
keywords = ["segfault"]
related = ["CVE-2020-26235", "RUSTSEC-2020-0071"]

[versions]
patched = []
```

# Potential segfault in `localtime_r` invocations

### Impact

Unix-like operating systems may segfault due to dereferencing a dangling pointer in specific circumstances. This requires an environment variable to be set in a different thread than the affected functions. This may occur without the user's knowledge, notably in a third-party library.

### Workarounds

No workarounds are known.

### References

- [time-rs/time#293](https:/time-rs/time/issues/293)