CVE-2026-23954

HIGHNVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

Score 8.7 from GitHub Security Advisory (severity: HIGH) published 2026-01-22. NVD baseline CVSS 8.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.7Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Incus is a system container and virtual machine manager. Versions 6.21.0 and below allow a user with the ability to launch a container with a custom image (e.g a member of the ‘incus’ group) to use directory traversal or symbolic links in the templating functionality to achieve host arbitrary file read, and host arbitrary file write. This ultimately results in arbitrary command execution on the host. When using an image with a metadata.yaml containing templates, both the source and target paths are not checked for symbolic links or directory traversal. This can also be exploited in IncusOS. A fix is planned for versions 6.0.6 and 6.21.0, but they have not been released at the time of publication.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
55(Track*)
EG Risk 55/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity87% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
51%
KEV
Not listed

Published

January 22, 2026

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Jun 8, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic
https://github.com/user-attachments/files/24473601/templates_arbitrary_write.patch
generic
https://github.com/user-attachments/files/24473599/template_arbitrary_write.sh
github Patch Available🟡 PoC Available

Container image templating arbitrary host file read and write · Advisory · lxc/incus · GitHub

https://github.com/lxc/incus/security/advisories/GHSA-7f67-crqm-jgh7
generic

incus/internal/server/instance/drivers/driver_lxc.go at 920e06984c2ca630862565d9d6186d6af1e46dd0 · lxc/incus · GitHub

https://github.com/lxc/incus/blob/HEAD/internal/server/instance/drivers/driver_lxc.go#L7294
generic

incus/internal/server/instance/drivers/driver_lxc.go at 920e06984c2ca630862565d9d6186d6af1e46dd0 · lxc/incus · GitHub

https://github.com/lxc/incus/blob/HEAD/internal/server/instance/drivers/driver_lxc.go#L7215

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
gogithub.com/lxc/incus/v6/cmd/incusd—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 1 ecosystem)
Go(3)
PackageVulnerable rangeFixed inDependents
github.com/lxc/incus———
github.com/lxc/incus/v6———
github.com/lxc/incus/v6/cmd/incusd———

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 51× 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.

Showing the most recent 100 of 109 total refreshes for this CVE.

  1. 2026-07-27 14:13 UTCEPSS rescore
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  1. 2026-07-13 22:30 UTCEPSS rescore
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  75. 2026-05-31 22:30 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-23954?
CVE-2026-23954 is a high vulnerability published on January 22, 2026. Incus is a system container and virtual machine manager. Versions 6.21.0 and below allow a user with the ability to launch a container with a custom image (e.g a member of the ‘incus’ group) to use directory traversal or symbolic links in the templating functionality to achieve host arbitrary file…
When was CVE-2026-23954 disclosed?
CVE-2026-23954 was first published in the National Vulnerability Database on January 22, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23954 actively exploited?
CVE-2026-23954 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 49.5% of all scored CVEs.
What is the CVSS score of CVE-2026-23954?
CVE-2026-23954 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-23954?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23954, 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.

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