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RUSTSEC-2026-0072
No affected components available
Computing an X25519 shared secret with
x25519_dalek::StaticSecret::diffie_hellman does not include the
check that the key exchange was contributory, i.e. does not ensure on
its own that the resulting shared secret is non-zero.
Impact
RFC 9180 mandates that implementations of HPKE must check for all zero Diffie-Hellman shared secrets and abort if so.
Applications using hpke-rs with the RustCryto provider would not perform this check allowing for non-contributive Diffie-Hellman shared secrets. Applications using hpke-rs with the libcrux provider are not affected.
Mitigation
Starting with version 0.6.0, an error will be returned when
the computed Diffie-Hellman shared secret is all-zero.
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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