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: 0.4%, top 69% 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
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 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)
EPSS
31.1%
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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 41× 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. 2026-07-15 23:52 UTCEG score recompute
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 02:00 UTCEPSS rescore
  4. 2026-07-15 01:52 UTCEG score recompute
  5. 2026-07-14 03:52 UTCEG score recompute
  6. 2026-07-13 22:31 UTCEPSS rescore
  7. 2026-07-13 06:13 UTCEPSS rescore
  8. 2026-07-13 05:52 UTCEG score recompute
  9. 2026-07-12 07:52 UTCEG score recompute
  10. 2026-07-12 05:46 UTCEPSS rescore
  11. 2026-07-11 09:52 UTCEG score recompute
  12. 2026-07-11 08:27 UTCEPSS rescore
  13. 2026-07-10 11:52 UTCEG score recompute
  14. 2026-07-09 19:10 UTCEPSS rescore
  15. 2026-07-09 13:51 UTCEG score recompute
  16. 2026-07-08 15:49 UTCEG score recompute
  17. 2026-07-08 15:16 UTCEPSS rescore
  18. 2026-07-07 17:50 UTCEG score recompute
  19. 2026-07-07 13:46 UTCEPSS rescore
  20. 2026-07-06 19:47 UTCEG score recompute
  21. 2026-07-06 16:27 UTCEPSS rescore
  22. 2026-07-06 02:23 UTCEPSS rescore
  23. 2026-07-05 21:44 UTCEG score recompute
  24. 2026-07-05 02:31 UTCEPSS rescore
  25. 2026-07-04 23:44 UTCEG score recompute
Show 16 more
  1. 2026-07-04 06:31 UTCEPSS rescore
  2. 2026-07-04 01:43 UTCEG score recompute
  3. 2026-07-03 03:43 UTCEG score recompute
  4. 2026-07-02 05:42 UTCEG score recompute
  5. 2026-07-01 15:07 UTCEPSS rescore
  6. 2026-07-01 07:41 UTCEG score recompute
  7. 2026-06-30 23:22 UTCEPSS rescore
  8. 2026-06-30 09:41 UTCEG score recompute
  9. 2026-06-29 14:06 UTCEPSS rescore
  10. 2026-06-29 11:41 UTCEG score recompute
  11. 2026-06-28 14:07 UTCEPSS rescore
  12. 2026-06-28 13:41 UTCEG score recompute
  13. 2026-06-28 04:56 UTCEPSS rescore
  14. 2026-06-27 15:41 UTCEG score recompute
  15. 2026-06-26 17:42 UTCEG score recompute
  16. 2026-06-26 17:41 UTCNVD updatefirst tracked

Related CVEs(same CWE)

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 31.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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.

Dependency Blast Radius

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