GHSA-gcx5-hxj7-gpqq

Source

https://github.com/advisories/GHSA-gcx5-hxj7-gpqq

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-gcx5-hxj7-gpqq/GHSA-gcx5-hxj7-gpqq.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-gcx5-hxj7-gpqq

Aliases

CVE-2026-107297

Published

2026-10-08T17:39:46Z

Modified

2026-10-08T18:00:08Z

Severity

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

Summary

msgpack5: Quadratic parsing in the streaming decoder

Details

Impact

The streaming decoder reparses an incomplete container from the beginning whenever another chunk arrives. A remote peer can split one valid MessagePack value across many small chunks, causing quadratic CPU usage and blocking the event loop.

Patches

The decoder now preserves incremental container state so completed elements are not parsed again when more input arrives.

Workarounds

Buffer each complete MessagePack value before decoding it, or limit the number of chunks accepted for a single value.

Database specific

{
    "cwe_ids": [
        "CWE-407"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-08T17:39:46Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
}

References

Affected packages

npm / msgpack5

Package

Name: msgpack5; View open source insights on deps.dev
Purl: pkg:npm/msgpack5

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

6.1.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-gcx5-hxj7-gpqq/GHSA-gcx5-hxj7-gpqq.json"