Path traversal in the CLI client image export and copy functionality in Canonical LXD from 4.0.2 before 4.0.14, 5.0.10, 5.21.8, and 6.10 on all platforms allows a remote malicious or machine-in-the-middle image server to overwrite arbitrary local files and execute code on the client system via a crafted Content-Disposition header filename parameter during unified image export or copy operations into a local directory target.
CVE-2026-86334
MEDIUMPre-NVD 4.24.2—Trending — 3 sources updated this weekElevated
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 4.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (24th percentile of EPSS-scored CVEs). 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, secondary
4.2EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 4.2Exploit: Elevated riskExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 4.2
- EG Score
- 4.2MEDIUMmedium confidence
- EG Risk
- 35EG Risk 35/100CISA SSVC
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 computedSeverity42% × 45%Exploitation40% × 40%Automatability0% × 15%CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 0.3%
- EPSS %ILE
- 24th
- KEV
- Not listed
CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
September 28, 2026
Last Modified
September 28, 2026
Advisory Details (6)
Auto-updated Sep 28, 2026🔬 Proof of concept available. Patch available. Sources: github, github_pr.
github_pr
client/images: sanitize server-provided image file names (From Incus)
Fix merged in canonical/lxd PR #18940 on 2026-09-02 — awaiting tagged release
https://github.com/canonical/lxd/pull/18940github_pr
client/images: sanitize server-provided image file names (From Incus) (release-6.9)
Fix merged in canonical/lxd PR #18975 on 2026-09-11 — awaiting tagged release
https://github.com/canonical/lxd/pull/18975github_pr
client/images: sanitize server-provided image file names (From Incus) (stable-5.21)
Fix merged in canonical/lxd PR #18974 on 2026-09-11 — awaiting tagged release
https://github.com/canonical/lxd/pull/18974github_pr
client/images: sanitize server-provided image file names (From Incus) (stable-5.0)
Fix merged in canonical/lxd PR #18976 on 2026-09-09 — awaiting tagged release
https://github.com/canonical/lxd/pull/18976github_pr
client/images: sanitize server-provided image file names (From Incus) (stable-4.0)
Fix merged in canonical/lxd PR #18977 on 2026-09-10 — awaiting tagged release
https://github.com/canonical/lxd/pull/18977github Patch Available🟡 PoC Available
CLI path traversal when exporting an image from a malicious server · Advisory · canonical/lxd · GitHub
https://github.com/canonical/lxd/security/advisories/GHSA-g4cm-f533-78hqWeakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 12× in last 7d / 12× 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.
- 2026-10-03 15:49 UTCEG score recompute
- 2026-10-02 17:57 UTCEPSS rescore
- 2026-10-02 16:24 UTCEG score recompute
- 2026-10-01 19:50 UTCEPSS rescore
- 2026-09-30 17:29 UTCEG score recompute
- 2026-09-30 15:04 UTCEPSS rescore
- 2026-09-29 18:05 UTCEG score recompute
- 2026-09-28 18:21 UTCEG score recompute
- 2026-09-28 18:05 UTCEG score recompute
- 2026-09-28 14:24 UTCEG score recompute
- 2026-09-28 13:27 UTCEG score recompute
- 2026-09-28 13:27 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-86334?
CVE-2026-86334 is a medium vulnerability published on September 28, 2026. Path traversal in the CLI client image export and copy functionality in Canonical LXD from 4.0.2 before 4.0.14, 5.0.10, 5.21.8, and 6.10 on all platforms allows a remote malicious or machine-in-the-middle image server to overwrite arbitrary local files and execute code on the client system via a…
When was CVE-2026-86334 disclosed?
CVE-2026-86334 was first published on September 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86334 actively exploited?
CVE-2026-86334 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (24th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-86334?
CVE-2026-86334 has a CVSS base score of 4.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-86334?
A fix for CVE-2026-86334 is available: update to the fixed version the vendor names in its advisory.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-86334
Is Your Infrastructure Affected by CVE-2026-86334?
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