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CVE-2026-40898— quic-go: HTTP/3 QPACK Trailer Expansion Memory Exhaustion

Quick assessment

Affected
quic-go quic-go
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

quic-go是Lucas Clemente个人开发者的一种 QUIC 协议、RFC 9000协议在 Go 中的实现。 quic-go 0.59.1之前版本存在安全漏洞，该漏洞源于HTTP/3实现中未对解码后的尾部字段部分施加大小限制，可能导致攻击者通过发送特制QPACK编码帧造成内存耗尽。

CVSS 5.3 · Medium EPSS 0.49% · P41

Affected Version Matrix 1

VendorProduct Version RangeStatus
quic-go quic-go < 0.59.1 affected
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I. Basic Information for CVE-2026-40898

Vulnerability Information
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Vulnerability Title
quic-go: HTTP/3 QPACK Trailer Expansion Memory Exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
quic-go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
quic-go是Lucas Clemente个人开发者的一种 QUIC 协议、RFC 9000协议在 Go 中的实现。 quic-go 0.59.1之前版本存在安全漏洞，该漏洞源于HTTP/3实现中未对解码后的尾部字段部分施加大小限制，可能导致攻击者通过发送特制QPACK编码帧造成内存耗尽。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
quic-go quic-go < 0.59.1 -

II. Public POCs for CVE-2026-40898

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III. Intelligence Information for CVE-2026-40898

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Vendor Advisories for CVE-2026-40898 (1)

Vendor Pages for CVE-2026-40898 (1)

IV. Related Vulnerabilities

Same product: quic-go
Same vendor: quic-go
Same weakness: CWE-770

V. Comments for CVE-2026-40898

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