# ws: Memory exhaustion DoS from tiny fragments and data chunks

Advisory record · `GHSA-96hv-2xvq-fx4p`

- **Identifiers:** `GHSA-96hv-2xvq-fx4p` · `CVE-2026-48779`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html) · [CWE-770](https://cwe.mitre.org/data/definitions/770.html) · [CWE-1050](https://cwe.mitre.org/data/definitions/1050.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md) · [CWE-1050](https://agentprime.io/advisories/tag/cwe-1050.md)
- **Published:** 15 Jun 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 15 Jun 2026, 16:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `ws` (npm): affected `>=1.1.0, <5.2.5 || >=6.0.0, <6.2.4 || >=7.0.0, <7.5.11 || >=8.0.0, <8.21.0`; fixed in `5.2.5`, `6.2.4`, `7.5.11`, `8.21.0`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.014, the 73rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 15 Jun 2026. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-96hv-2xvq-fx4p](https://github.com/advisories/GHSA-96hv-2xvq-fx4p)
- [OSV: GHSA-96hv-2xvq-fx4p](https://osv.dev/vulnerability/GHSA-96hv-2xvq-fx4p)
- <https://github.com/websockets/ws/security/advisories/GHSA-96hv-2xvq-fx4p>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-48779>
- <https://github.com/websockets/ws/commit/fd36cd864fcdf62a08273a99e19a7d975401fee8>
- <https://github.com/websockets/ws/commit/bca91adf15677e47dbe4f959653452727be28b94>
- <https://github.com/websockets/ws/commit/b5372ac67bb97a773727b8e9f5035a8123556d53>
- <https://github.com/websockets/ws/commit/86d3e8a5fb0246ed373860c5fbb0de88824a27f7>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48779.json>
- <https://github.com/websockets/ws>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2489661>
- <https://access.redhat.com/security/cve/CVE-2026-48779>
- <https://access.redhat.com/errata/RHSA-2026:37272>
- <https://access.redhat.com/errata/RHSA-2026:36820>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-96hv-2xvq-fx4p>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-96hv-2xvq-fx4p/>. Everything for agents: <https://agentprime.io/llms.txt>.