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CVE-2026-56329 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

Capgo before 12.128.2 contains a cross-tenant preview namespace collision vulnerability caused by non-bijective decoding of double underscores to dots in preview hostname parsing. Attackers can register app IDs with underscores that collide with other tenants' dotted app IDs, causing preview misrouting and denial of preview access for victim applications.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:4.9 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:L

CNA: [email protected]CVSS-B:6.4 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/Cap-go/capgo/security/advisories/GHSA-76qq-gg2p-pwwj	CISA-ADP	AdvisoryTechnical AnalysisVendor
https://github.com/Cap-go/capgo/security/advisories/GHSA-76qq-gg2p-pwwj	[email protected]	AdvisoryTechnical AnalysisVendor
https://www.vulncheck.com/advisories/capgo-cross-tenant-preview-namespace-collision-via-non-bijective-underscore-decoding	[email protected]	AdvisoryVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-436	Interpretation Conflict	[email protected]

Affected Products

Product	Versions
Capgo	< 12.128.2 (semver)
CPE No CPEs found in CPE dictionary for this product. Remediation Upgrade: 12.128.2moderate effort

Change History

2 change records found show changes

Date	Action	Recorded By
Jul 10, 2026	CVE Modified	CISA-ADP
Jul 10, 2026	New CVE Received	[email protected]