CVE-2026-44302: Snappier: Infinite loop in SnappyStream decompression on malformed framed input

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-12 · updated 2026-10-26
Weakness: CWE-835

Description

Snappier is a high performance C# implementation of the Snappy compression algorithm. Prior to 1.3.1, Snappier.SnappyStream enters an uncatchable infinite loop when decompressing a malformed framed-format Snappy stream as small as 15 bytes. This vulnerability is fixed in 1.3.1.

Affected products

brantburnett Snappier: before 1.3.1

References

https://github.com/brantburnett/Snappier/security/advisories/GHSA-pggp-6c3x-2xmx
https://github.com/brantburnett/Snappier/security/advisories/GHSA-pggp-6c3x-2xmx

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