Update Rust crate rand to 0.10.0 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rand (source)	dependencies	minor	0.9.0 → 0.10.0

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Rand is unsound with a custom logger using rand::rng()

GHSA-cq8v-f236-94qc

More information

Details

It has been reported (by @​lopopolo) that the rand library is unsound (i.e. that safe code using the public API can cause Undefined Behaviour) when all the following conditions are met:

• The log and thread_rng features are enabled
• A custom logger is defined
• The custom logger accesses rand::rng() (previously rand::thread_rng()) and calls any TryRng (previously RngCore) methods on ThreadRng
• The ThreadRng (attempts to) reseed while called from the custom logger (this happens every 64 kB of generated data)
• Trace-level logging is enabled or warn-level logging is enabled and the random source (the getrandom crate) is unable to provide a new seed

TryRng (previously RngCore) methods for ThreadRng use unsafe code to cast *mut BlockRng<ReseedingCore> to &mut BlockRng<ReseedingCore>. When all the above conditions are met this results in an aliased mutable reference, violating the Stacked Borrows rules. Miri is able to detect this violation in sample code. Since construction of aliased mutable references is Undefined Behaviour, the behaviour of optimized builds is hard to predict.

Severity

Low

References

• https://github.com/rust-random/rand/pull/1763
• https://rustsec.org/advisories/RUSTSEC-2026-0097.html
• https://github.com/advisories/GHSA-cq8v-f236-94qc

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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Release Notes

rust-random/rand (rand)

v0.10.0

Compare Source

Changes

• The dependency on rand_chacha has been replaced with a dependency on chacha20. This changes the implementation behind StdRng, but the output remains the same. There may be some API breakage when using the ChaCha-types directly as these are now the ones in chacha20 instead of rand_chacha (#​1642).
• Rename fns IndexedRandom::choose_multiple -> sample, choose_multiple_array -> sample_array, choose_multiple_weighted -> sample_weighted, struct SliceChooseIter -> IndexedSamples and fns IteratorRandom::choose_multiple -> sample, choose_multiple_fill -> sample_fill (#​1632)
• Use Edition 2024 and MSRV 1.85 (#​1653)
• Let Fill be implemented for element types, not sliceable types (#​1652)
• Fix OsError::raw_os_error on UEFI targets by returning Option<usize> (#​1665)
• Replace fn TryRngCore::read_adapter(..) -> RngReadAdapter with simpler struct RngReader (#​1669)
• Remove fns SeedableRng::from_os_rng, try_from_os_rng (#​1674)
• Remove Clone support for StdRng, ReseedingRng (#​1677)
• Use postcard instead of bincode to test the serde feature (#​1693)
• Avoid excessive allocation in IteratorRandom::sample when amount is much larger than iterator size (#​1695)
• Rename os_rng -> sys_rng, OsRng -> SysRng, OsError -> SysError (#​1697)
• Rename Rng -> RngExt as upstream rand_core has renamed RngCore -> Rng (#​1717)

Additions

• Add fns IndexedRandom::choose_iter, choose_weighted_iter (#​1632)
• Pub export Xoshiro128PlusPlus, Xoshiro256PlusPlus prngs (#​1649)
• Pub export ChaCha8Rng, ChaCha12Rng, ChaCha20Rng behind chacha feature (#​1659)
• Fn rand::make_rng() -> R where R: SeedableRng (#​1734)

Removals

• Removed ReseedingRng (#​1722)
• Removed unused feature "nightly" (#​1732)
• Removed feature small_rng (#​1732)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.87%. Comparing base (a81c703) to head (22d6570).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #515   +/-   ##
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  Coverage   77.87%   77.87%           
=======================================
  Files           4        4           
  Lines         226      226           
=======================================
  Hits          176      176           
  Misses         50       50           

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