CVE-2021-37606: Meow Hash Project Meow Hash

Medium severity, CVSS 5.3. EPSS: 0.7% chance of exploitation in the next 30 days.

Meow hash 0.5/calico does not sufficiently thwart key recovery by an attacker who can query whether there's a collision in the bottom bits of the hashes of two messages, as demonstrated by an attack against a long-running web service that allows the attacker to infer collisions by measuring timing differences.

Affected products

• Meow Hash Project Meow Hash: version 0.5 only

Published 2021-07-30. Last modified 2026-06-17.