XQUIC up to 1.8.3 on Linux QUIC Protocol input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.6$0-$5k0.00

Summaryinfo

A vulnerability was found in XQUIC up to 1.8.3 on Linux and classified as critical. Impacted is an unknown function of the component QUIC Protocol Handler. The manipulation results in input validation. This vulnerability was named CVE-2026-6328. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in XQUIC up to 1.8.3 on Linux. It has been classified as critical. Affected is an unknown code of the component QUIC Protocol Handler. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-6328 since 04/15/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/17/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-22832). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.6

VulDB Base Score: 5.6
VulDB Temp Score: 5.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

04/15/2026 Advisory disclosed
04/15/2026 +0 days CVE reserved
04/15/2026 +0 days VulDB entry created
04/17/2026 +2 days VulDB entry last update

Sourcesinfo

Advisory: 4764604a0e487eeb49338b4498aecda2194eae84
Status: Confirmed

CVE: CVE-2026-6328 (🔒)
GCVE (CVE): GCVE-0-2026-6328
GCVE (VulDB): GCVE-100-357648
EUVD: 🔒

Entryinfo

Created: 04/15/2026 07:16
Updated: 04/17/2026 21:41
Changes: 04/15/2026 07:16 (65), 04/17/2026 21:41 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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