Allocation of Resources Without Limits or Throttling Affecting kubo package, versions <0.41.0-r6


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.04% (15th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-KUBO-17195355
  • published6 Jun 2026
  • disclosed4 Jun 2026

Introduced: 4 Jun 2026

NewCVE-2026-40898  (opens in a new tab)
CWE-770  (opens in a new tab)

How to fix?

Upgrade Chainguard kubo to version 0.41.0-r6 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kubo package and not the kubo package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

quic-go is an implementation of the QUIC protocol in Go. Prior to version 0.59.1, an attacker can cause excessive memory allocation in quic-go's HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame that decodes into a large trailer field section with many unique field names and/or large values. The implementation builds an http.Header for the corresponding http.Request or http.Response, while only enforcing limits on the size of the QPACK-compressed HEADERS frame, not on the decoded field section. This can lead to memory exhaustion. This is very similar to CVE-2025-64702. The difference is that this issue uses HTTP trailers, rather than HTTP headers, as the attack vector. A misbehaving or malicious peer can cause a denial-of-service (DoS) attack against quic-go's HTTP/3 servers or clients by triggering excessive memory allocation, potentially leading to crashes or resource exhaustion. This affects both servers and clients due to symmetric header construction. Version 0.59.1 enforces RFC 9114 decoded field section size limits for trailers as well. It incrementally decodes QPACK entries and checks the field section size after each entry, aborting the stream if an entry causes the limit to be exceeded.

CVSS Base Scores

version 3.1