CVE-2026-23953

HIGHNVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 90% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
8.7
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.7Exploit: NoneExposed: 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. In versions 6.20.0 and below, a user with the ability to launch a container with a custom YAML configuration (e.g a member of the ‘incus’ group) can create an environment variable containing newlines, which can be used to add additional configuration items in the container’s lxc.conf due to newline injection. This can allow adding arbitrary lifecycle hooks, ultimately resulting in arbitrary command execution on the host. Exploiting this issue on IncusOS requires a slight modification of the payload to change to a different writable directory for the validation step (e.g /tmp). This can be confirmed with a second container with /tmp mounted from the host (A privileged action for validation only). 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)
EPSS
37.7%
KEV
Not listed

Published

January 22, 2026

Last Modified

January 30, 2026

Advisory Details (3)

Auto-updated Jun 8, 2026
No patch confirmed yet.
generic
https://github.com/user-attachments/files/24473685/environment_newline_injection.patch
generic
https://github.com/user-attachments/files/24473682/environment_newline_injection.sh
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#L1081

Affected Packages

(2 across 1 ecosystem)
Go(2)
PackageVulnerable rangeFixed inDependents
github.com/lxc/incus———
github.com/lxc/incus/v6———

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 52× 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.

  1. 2026-07-16 17:03 UTCEPSS rescore
  2. 2026-07-16 17:03 UTCEPSS rescore
  3. 2026-07-15 16:57 UTCEPSS rescore
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  8. 2026-07-13 16:38 UTCOSV refresh
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  11. 2026-07-12 05:46 UTCEPSS rescore
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  1. 2026-07-01 15:06 UTCEPSS rescore
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  7. 2026-06-28 04:56 UTCEPSS rescore
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  9. 2026-06-27 03:08 UTCEPSS rescore
  10. 2026-06-25 14:16 UTCOSV refresh
  11. 2026-06-25 13:49 UTCEPSS rescore
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  23. 2026-06-19 19:25 UTCEPSS rescore
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  25. 2026-06-18 17:52 UTCEPSS rescore
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  30. 2026-06-14 23:18 UTCEPSS rescore
  31. 2026-06-13 23:00 UTCEPSS rescore
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  40. 2026-06-08 04:31 UTCEG score recompute
  41. 2026-06-07 15:25 UTCEPSS rescore
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  44. 2026-06-06 13:47 UTCEPSS rescore
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  46. 2026-06-05 22:47 UTCEPSS rescore
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  57. 2026-05-31 22:30 UTCEPSS rescore
  58. 2026-05-31 22:30 UTCEPSS rescore
  59. 2026-05-29 15:24 UTCEG score recompute
  60. 2026-05-29 13:54 UTCOSV refresh
  61. 2026-05-29 13:44 UTCEPSS rescore
  62. 2026-05-29 13:44 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-23953?
CVE-2026-23953 is a high vulnerability published on January 22, 2026. Incus is a system container and virtual machine manager. In versions 6.20.0 and below, a user with the ability to launch a container with a custom YAML configuration (e.g a member of the ‘incus’ group) can create an environment variable containing newlines, which can be used to add additional…
When was CVE-2026-23953 disclosed?
CVE-2026-23953 was first published in the National Vulnerability Database on January 22, 2026, with the most recent update on January 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23953 actively exploited?
CVE-2026-23953 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 37.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-23953?
CVE-2026-23953 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-23953?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23953, 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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