What’s Vulnerable › Vulnerabilities

CVE-2021-37606

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-30 · updated 2026-06-17
• Weakness: CWE-203

Description

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: 0.5

References

• https://news.ycombinator.com/item?id=27978878
• https://peter.website/meow-hash-cryptanalysis
• https://news.ycombinator.com/item?id=27978878
• https://peter.website/meow-hash-cryptanalysis

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