← back to feed
CVE-2026-85526

CVE-2026-85526

waiting for further signalsZero needs more public information before it can validate it.

GHSA-h85r-gjgx-g2rv ↗EUVD-2026-88257 ↗

no check availablenot proven exploitable
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).−3.1dkevAttacks confirmed in the real world.
canonical LXD >= 4.0.2
fixed in 4.0.14, 5.0.10, 5.21.8, 6.9-bf243da, 6.10
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
ETK-2026-3656Zero's internal tracking ID, independent of the CVE number., permanent identifier
cvss9.9cna vendorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
4h 24msince last run
11mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = cve.org publication
public poc−3.1dtrigger signal (cve.org) +0dwaiting for further signals+38d
−2d
−1d
0

description

LXD Btrfs optimized-backup imports can mishandle subvolume paths supplied in a backup archive. An authenticated user with instance or storage-volume creation privileges could cause root-privileged operations on host filesystem paths outside the intended storage area. Exploitation requires a Btrfs storage pool and a crafted optimized backup import.

mitigation

Upgrade lxd to 4.0.14, 5.0.10, 5.21.8, 6.9-bf243da, 6.10 or later.

fixed in 4.0.14, 5.0.10, 5.21.8, 6.9-bf243da, 6.10

check
no
exploit
no
automationDeterministic: a check that runs on its own, the same request on every target. Contextual: an agentic technique that needs to be applied per target, for bugs that depend on contextual flows.
contextual
auth requiredWhether an attacker needs an account first, based on the CVSS vector's Privileges Required.
yes, low privileges
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
–
agent run time
11m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-09-28 13:21Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
−3.1d
Δ to kevAttacks confirmed in the real world.
–

outcome

Contextual, not validated: no deterministic check could cover this one, and no technique passed our review.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

  1. 2026-09-28 13:21Z
  2. 2026-09-28 13:21Z
  3. 2026-09-28 13:21Z

this entry in the feed

GET /api/v1/feed/CVE-2026-85526

{
  "etk_id": "ETK-2026-3656",
  "cve_id": "CVE-2026-85526",
  "display_id": "CVE-2026-85526",
  "ghsa_id": "GHSA-h85r-gjgx-g2rv",
  "euvd_id": "EUVD-2026-88257",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Path traversal in LXD Btrfs optimized backup import",
  "summary": "LXD Btrfs optimized-backup imports can mishandle subvolume paths supplied in a backup archive. An authenticated user with instance or storage-volume creation privileges could cause root-privileged operations on host filesystem paths outside the intended storage area. Exploitation requires a Btrfs storage pool and a crafted optimized backup import.",
  "mitigation": "Upgrade lxd to 4.0.14, 5.0.10, 5.21.8, 6.9-bf243da, 6.10 or later.",
  "vendor": "canonical",
  "product": "LXD",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 4.0.2"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "4.0.14",
        "5.0.10",
        "5.21.8",
        "6.9-bf243da",
        "6.10"
      ],
      "package_name": "lxd",
      "purl": null
    }
  ],
  "cwes": [
    22
  ],
  "cvss_score": 9.9,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 11.392438766666666,
  "t0_at": "2026-09-28T13:21:40.621000+00:00",
  "signals": {
    "public_poc": {
      "at": "2026-09-25T11:08:27+00:00",
      "days": -3.092518761574074,
      "is_lower_bound": false,
      "measured_at": "2026-09-28T13:21:40.621000+00:00",
      "url": "https://github.com/canonical/lxd/security/advisories/GHSA-h85r-gjgx-g2rv"
    },
    "trigger_signal": {
      "at": "2026-09-28T13:21:40.621000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-28T13:21:40.621000+00:00",
      "url": "https://github.com/canonical/lxd/security/advisories/GHSA-h85r-gjgx-g2rv"
    }
  }
}

published 2026-11-05 18:16Z
last change 2026-11-05 20:10Z

Need the technical details behind an entry?

Every entry here shows what we attempted and when. The technical details, the generated exploit that fired it and the evidence behind the verdict are not public. Tell us about your use case and we’ll get back to you about extended API access.

Protected by reCAPTCHA; the Google Privacy Policy and Terms of Service apply.