CVE-2026-31812
Received Received - Intake
Denial of Service in Quinn QUIC via Malformed Transport Parameters

Publication date: 2026-03-10

Last updated on: 2026-03-10

Assigner: GitHub, Inc.

Description
Quinn is a pure-Rust, async-compatible implementation of the IETF QUIC transport protocol. Prior to 0.11.14, a remote, unauthenticated attacker can trigger a denial of service in applications using vulnerable quinn versions by sending a crafted QUIC Initial packet containing malformed quic_transport_parameters. In quinn-proto parsing logic, attacker-controlled varints are decoded with unwrap(), so truncated encodings cause Err(UnexpectedEnd) and panic. This is reachable over the network with a single packet and no prior trust or authentication. This vulnerability is fixed in 0.11.14.
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Meta Information
Published
2026-03-10
Last Modified
2026-03-10
Generated
2026-05-07
AI Q&A
2026-03-11
EPSS Evaluated
2026-05-05
NVD
CVE-2026-31812
EUVD
EUVD-2026-10908
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
quinn quinn to 0.11.14 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-248 An exception is thrown from a function, but it is not caught.
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability exists in Quinn, a Rust implementation of the IETF QUIC transport protocol. Before version 0.11.14, a remote attacker who is not authenticated can cause a denial of service by sending a specially crafted QUIC Initial packet with malformed transport parameters. The issue arises because the parsing logic uses unwrap() on attacker-controlled varints, which leads to a panic when truncated encodings are encountered. This panic causes the application to crash or become unavailable.


How can this vulnerability impact me? :

The vulnerability can lead to a denial of service (DoS) condition in applications using affected versions of Quinn. An attacker can remotely crash the application by sending a single malformed packet without needing any prior authentication or trust. This can result in service interruptions and unavailability.


How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:

I don't know


How can this vulnerability be detected on my network or system? Can you suggest some commands?

I don't know


What immediate steps should I take to mitigate this vulnerability?

To mitigate this vulnerability, you should upgrade the quinn library to version 0.11.14 or later, where the issue has been fixed.


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