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.
CVE-2026-56329
MEDIUMPre-NVD 6.46.4—Trending — 3 sources updated this weekElevated
EchelonGraph scoreHIGH confidence
Score 6.4 from GitHub Security Advisory published 2026-07-10. a secondary CVSS source baseline 6.4; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
6.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: —CVSS: 6.4Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.4
- EG Score
- 6.4(high)
- EPSS
- —
- KEV
- Not listed
Published
July 10, 2026
Last Modified
July 10, 2026
Advisory Details (2)
Auto-updated Jul 10, 2026🔬 Proof of concept available. Patch available. Sources: github.
generic
Capgo - Cross-Tenant Preview Namespace Collision via Non-Bijective Underscore Decoding | Advisories | VulnCheck
https://www.vulncheck.com/advisories/capgo-cross-tenant-preview-namespace-collision-via-non-bijective-underscore-decodinggithub Patch Available🟡 PoC Available
Cross-tenant preview namespace collision via non-bijective __ → . decoding causes preview misrouting / denial of preview · Advisory · Cap-go/capgo · GitHub
https://github.com/Cap-go/capgo/security/advisories/GHSA-76qq-gg2p-pwwjVendor Advisories for CVE-2026-56329(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 4× in last 7d / 4× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-11 14:49 UTCEG score recompute
- 2026-07-11 14:48 UTCGHSA enrichment
- 2026-07-10 14:43 UTCEG score recompute
- 2026-07-10 14:42 UTCMITRE cvelistV5first tracked
Frequently asked(4)
What is CVE-2026-56329?
CVE-2026-56329 is a medium vulnerability published on July 10, 2026. 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…
When was CVE-2026-56329 disclosed?
CVE-2026-56329 was first published in the National Vulnerability Database on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-56329?
CVE-2026-56329 has a CVSS v3 base score of 6.4 (NVD).
How do I remediate CVE-2026-56329?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56329, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-56329
Is Your Infrastructure Affected by CVE-2026-56329?
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