CVE-2026-44302 Snappier: Infinite loop in SnappyStream decompression on malformed framed input
Attackers can cause an infinite loop and denial of service in Snappier by providing malformed Snappy stream input.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-44302?
CVE-2026-44302 is a high-severity denial of service vulnerability in brantburnett Snappier, published on 12 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-835
Which versions are affected by CVE-2026-44302?
2 open source packages ship an affected version, including Snappier.
| Package | Affected | Fixed in |
|---|---|---|
Snappier NuGet | All versions | 1.3.1 |
Snappier NuGet | All versions | 1.3.1 |
How do I fix CVE-2026-44302?
Upgrade Snappier to 1.3.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-44302 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44302 exists.
Sources
Also known as GHSA-pggp-6c3x-2xmx.