Reported

May 11, 2026

Issued

August 4, 2026

Package

rkyv (crates.io)

Type

Vulnerability

Categories

• memory-exposure
• denial-of-service

Keywords

#out-of-bounds-read #validation #hashmap

References

• https://github.com/rkyv/rkyv/issues/663
• https://github.com/rkyv/rkyv/issues/664
• https://github.com/rkyv/rkyv/issues/665
• https://github.com/rkyv/rkyv/issues/669
• https://github.com/rkyv/rkyv/commit/3c9d07fbff5949261bef38d00ab160b129bd9d3a
• https://github.com/rkyv/rkyv/commit/57086e1c7f417d0360c7045905db3b3d8e30f866

Patched

• >=0.8.17

Unaffected

• <0.8.0-rc.1

Description

The archive validator could accept certain malformed relative pointers and invalid ArchivedHashTable states. In particular, the hash table verifier did not ensure that the number of occupied buckets matched the table's declared length.

A crafted archive could pass the checks performed by the safe rkyv::access and rkyv::from_bytes APIs and then cause an out-of-bounds read in later validation, lookup, or deserialization. Depending on the input, this could perform scalar or SIMD reads outside the archive buffer or crash the process.

Version 0.8.17 strengthens archive range validation and rejects hash tables whose number of occupied buckets does not match their declared length. Users who process untrusted archives should upgrade to 0.8.17 or later.

Advisory available under CC0-1.0 license.