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Vulnerability record · CVE-2026-6328 · published 15 April 2026

CVE-2026-6328: Improper input validation vulnerability

Improper input validation, Improper verification of cryptographic signature vulnerability in XQUIC Project XQUIC xquic on Linux (QUIC protocol implementation, packet processing module, STREAM frame handler modules) allows Protocol Manipulation.This issue affects XQUIC: through 1.8.3.

8.3 CVSS 4.0 High EPSS 0.22% · top 88.2% CWE-20 · Improper input validationCWE-347 · Improper verification of cryptographic signature Deferred
8.3CVSS 4.0 base score
0.22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

Description

Improper input validation, Improper verification of cryptographic signature vulnerability in XQUIC Project XQUIC xquic on Linux (QUIC protocol implementation, packet processing module, STREAM frame handler modules) allows Protocol Manipulation.This issue affects XQUIC: through 1.8.3.

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/alibaba/xquic/commit/4764604a0e487eeb49338b4498aecda2194eae84

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Source: NIST National Vulnerability Database (record CVE-2026-6328), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.