CVE-2026-28384

CRITICALNVD 9.99.9—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.9 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 52% 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, nvd
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.9Exploit: None knownExposed: 0

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

An improper sanitization of the compression_algorithm parameter in Canonical LXD allows an authenticated, unprivileged user to execute commands as the LXD daemon on the LXD server via API calls to the image and backup endpoints. This issue affected LXD from 4.12 through 6.6 and was fixed in the snap versions 5.0.6-e49d9f4 (channel 5.0/stable), 5.21.4-1374f39 (channel 5.21/stable), and 6.7-1f11451 (channel 6.0 stable). The channel 4.0/stable is not affected as it contains version 4.0.10.

CVSS v3
9.9
EG Score
9.9(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity99% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
50%
KEV
Not listed

Published

March 12, 2026

Last Modified

September 18, 2026

Advisory Details (4)

Auto-updated Sep 18, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available

Authenticated host RCE via unsanitized compression_algorithm in image and backup API endpoints · Advisory · canonical/lxd · GitHub

Affected: 5.21.4-1374f39 (2026-03-11)

https://github.com/canonical/lxd/security/advisories/GHSA-4rmf-rcp8-2r9g
github_commit

commit 7046979645c2 (canonical/lxd)

Fix landed in canonical/lxd commit 7046979645c2 — awaiting tagged release

https://github.com/canonical/lxd/commit/7046979645c2ce1b63b2f9e60ddf6cbc4c4b78f9
github_commit

commit 043696a13171 (canonical/lxd)

Fix landed in canonical/lxd commit 043696a13171 — awaiting tagged release

https://github.com/canonical/lxd/commit/043696a13171ace7dd4c2b32d34ce039ab629052
generic

LXD Authenticated Remote Code Execution fixes available - News - Ubuntu Community Hub

https://discourse.ubuntu.com/t/lxd-authenticated-remote-code-execution-fixes-available/78365

Affected Packages

(4 across 3 ecosystems)
Debian:13(2)
PackageVulnerable rangeFixed inDependents
incus6.0.4-2 ... 6.0.4-2+deb13u4~bpo12+1 (9 versions)6.0.4-2+deb13u5—
lxd5.0.2+git20231211.1364ae4-9, 5.0.2+git20231211.1364ae4-9+deb13u1, 5.0.2+git20231211.1364ae4-9+deb13u2, 5.0.2+git20231211.1364ae4-9+deb13u35.0.2+git20231211.1364ae4-9+deb13u4—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
lxd5.0.2-5, 5.0.2-5+deb12u1, 5.0.2-5+deb12u2, 5.0.2-5+deb12u35.0.2-5+deb12u4—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
incus6.0.4-2 ... 6.0.5-8 (10 versions)6.0.6-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 31× 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. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 19:27 UTCEPSS rescore
  3. 2026-09-18 14:22 UTCEG score recompute
  4. 2026-09-17 19:30 UTCEPSS rescore
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-13 16:47 UTCEPSS rescore
  8. 2026-09-12 15:01 UTCEPSS rescore
  9. 2026-09-11 15:48 UTCEG score recompute▲ 0.50
  10. 2026-09-11 15:48 UTCNVD updateCVSS v3 → 9.9
  11. 2026-09-11 14:52 UTCEPSS rescore
  12. 2026-09-10 09:34 UTCEPSS rescore
  13. 2026-09-08 22:00 UTCEPSS rescore
  14. 2026-09-07 16:01 UTCEPSS rescore
  15. 2026-09-06 13:47 UTCEPSS rescore
  16. 2026-09-06 13:47 UTCEPSS rescore
  17. 2026-09-04 05:06 UTCEPSS rescore
  18. 2026-09-02 19:40 UTCOSV refresh
  19. 2026-09-02 14:11 UTCEPSS rescore
  20. 2026-09-01 13:53 UTCEPSS rescore
  21. 2026-09-01 04:39 UTCEPSS rescore
  22. 2026-09-01 04:39 UTCEPSS rescore
  23. 2026-08-30 19:17 UTCEPSS rescore
  24. 2026-08-30 01:22 UTCEPSS rescore
  25. 2026-08-28 21:41 UTCEPSS rescore
Show 42 more
  1. 2026-08-27 14:25 UTCEPSS rescore
  2. 2026-08-26 14:46 UTCEPSS rescore
  3. 2026-08-25 13:49 UTCEPSS rescore
  4. 2026-08-24 14:17 UTCEPSS rescore
  5. 2026-08-23 00:19 UTCEPSS rescore
  6. 2026-08-21 23:49 UTCEPSS rescore
  7. 2026-08-20 22:55 UTCEPSS rescore
  8. 2026-08-20 22:55 UTCEPSS rescore
  9. 2026-08-19 17:03 UTCEPSS rescore
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-17 13:47 UTCEPSS rescore
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 11:47 UTCEG score recompute
  14. 2026-08-16 02:14 UTCEPSS rescore
  15. 2026-08-15 01:30 UTCEPSS rescore
  16. 2026-08-14 07:44 UTCEG score recompute
  17. 2026-08-13 22:00 UTCEPSS rescore
  18. 2026-08-12 22:49 UTCEG score recompute
  19. 2026-08-12 13:50 UTCEPSS rescore
  20. 2026-08-11 21:44 UTCEG score recompute
  21. 2026-08-11 13:42 UTCEPSS rescore
  22. 2026-08-11 04:54 UTCEG score recompute
  23. 2026-08-11 00:00 UTCEPSS rescore
  24. 2026-08-09 17:39 UTCEG score recompute
  25. 2026-08-09 13:46 UTCEPSS rescore
  26. 2026-08-09 07:25 UTCEG score recompute
  27. 2026-08-08 16:37 UTCEPSS rescore
  28. 2026-08-07 18:08 UTCEG score recompute
  29. 2026-08-06 19:51 UTCEG score recompute
  30. 2026-08-06 13:46 UTCEPSS rescore
  31. 2026-08-06 01:57 UTCEG score recompute
  32. 2026-08-05 19:17 UTCEPSS rescore
  33. 2026-08-04 15:10 UTCEPSS rescore
  34. 2026-08-04 01:14 UTCEG score recompute
  35. 2026-08-03 10:36 UTCEPSS rescore
  36. 2026-08-02 17:24 UTCEG score recompute
  37. 2026-08-02 02:26 UTCEPSS rescore
  38. 2026-08-01 04:16 UTCEPSS rescore
  39. 2026-07-30 16:27 UTCEPSS rescore
  40. 2026-07-30 01:30 UTCEPSS rescore
  41. 2026-07-28 15:36 UTCEPSS rescore
  42. 2026-07-27 13:41 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-28384?
CVE-2026-28384 is a critical vulnerability published on March 12, 2026. An improper sanitization of the compression_algorithm parameter in Canonical LXD allows an authenticated, unprivileged user to execute commands as the LXD daemon on the LXD server via API calls to the image and backup endpoints. This issue affected LXD from 4.12 through 6.6 and was fixed in the…
When was CVE-2026-28384 disclosed?
CVE-2026-28384 was first published in the National Vulnerability Database on March 12, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-28384 actively exploited?
CVE-2026-28384 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 50.2% of all scored CVEs.
What is the CVSS score of CVE-2026-28384?
CVE-2026-28384 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-28384?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28384, 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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