CVE-2026-9639 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-9639MEDIUM

Canonical LXD — Authenticated Denial of Service via Malicious Backup Tarball in LXD

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  N  N  H    6.5   .0042   35.3     —

AFFECTED
  Product  Versions  Fixed
  LXD      5.21.0 –  —

TIMELINE
  May 26  Reserved by canonical
  Jun 26  EXPLOIT PUBLISHED — CVE-2026-9639 (Canonical LXD). Public exploit reference added.
  Jun 26  Published (CNA: canonical)

CWE-476 · CNA: canonical · CVSS v3.1 · 3 references · NVD status: Analyzed

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
May 26, 2026	Reserved	Reserved by canonical
June 26, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-9639 (Canonical LXD). Public exploit reference added.
June 26, 2026	Published	Published (CNA: canonical)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Canonical	LXD	—	5.21.0	—

Weaknesses

CWE-476

References (3)

https://github.com/canonical/lxd/pull/18320 [Issue Tracking, Patch]
https://github.com/canonical/lxd/pull/18390 [Issue Tracking, Patch]
https://github.com/canonical/lxd/security/advisories/GHSA-j93m-3j9p-m5m8 [Exploit, Patch, Vendor Advisory]

Authoritative record: CVE-2026-9639 at cve.org

Vendors: canonical

Weaknesses: CWE-476

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-9639 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.