CVE-2026-9639

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 56% 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, secondary
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.5Exploit: None knownExposed: 0

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

Nil-pointer dereference in CreateCustomVolumeFromBackup in LXD up to version 6.8 and 5.21 on Linux allows an authenticated user with can_create_storage_volumes permissions to cause a denial of service via a specially crafted custom-volume backup tarball that omits the expires_at snapshot field.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity65% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

June 26, 2026

Last Modified

July 2, 2026

Advisory Details (3)

Auto-updated Jun 26, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_pr.
github Patch Available🟡 PoC Available

CreateCustomVolumeFromBackup nil-pointer dereference on volumes[0].snapshots[*].expires_at · Advisory · canonical/lxd · GitHub

https://github.com/canonical/lxd/security/advisories/GHSA-j93m-3j9p-m5m8
github_pr

lxd/storage/backend/lxd: Validate snapshot.ExpiresAt is non-nil (stable-5.21)

Fix merged in canonical/lxd PR #18390 on 2026-06-03 — awaiting tagged release

https://github.com/canonical/lxd/pull/18390
github_pr

lxd/storage/backend/lxd: Validate snapshot.ExpiresAt is non-nil

Fix merged in canonical/lxd PR #18320 on 2026-05-22 — awaiting tagged release

https://github.com/canonical/lxd/pull/18320

Affected Packages

(2 across 2 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
lxd5.0.2+git20231211.1364ae4-1 ... 5.0.2-6 (17 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
lxd5.0.2+git20231211.1364ae4-9 ... 5.0.2+git20231211.1364ae4-9+deb13u6 (7 versions)5.0.2+git20231211.1364ae4-9+deb13u7—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 39× 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 103 total refreshes for this CVE.

  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-11 09:38 UTCEPSS rescore
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  1. 2026-08-20 22:56 UTCEPSS rescore
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  73. 2026-06-30 23:22 UTCEPSS rescore
  74. 2026-06-29 14:06 UTCEPSS rescore
  75. 2026-06-28 14:07 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-9639?
CVE-2026-9639 is a medium vulnerability published on June 26, 2026. Nil-pointer dereference in CreateCustomVolumeFromBackup in LXD up to version 6.8 and 5.21 on Linux allows an authenticated user with cancreatestoragevolumes permissions to cause a denial of service via a specially crafted custom-volume backup tarball that omits the expiresat snapshot field.
When was CVE-2026-9639 disclosed?
CVE-2026-9639 was first published in the National Vulnerability Database on June 26, 2026, with the most recent update on July 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9639 actively exploited?
CVE-2026-9639 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 55.8% of all scored CVEs.
What is the CVSS score of CVE-2026-9639?
CVE-2026-9639 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-9639?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9639, 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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