What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-31 · updated 2026-06-17
• Weakness: CWE-248

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.

Affected products

• quic-go: from 0.37.0 before 0.37.3 — fixed in 0.37.3

How to fix

Upgrade to a fixed version: quic-go 0.37.3. Check the vendor advisory for mitigations.

References

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

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