CVE-2026-66898

CRITICALPre-NVD 9.99.9
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This critical-severity CVE scores 9.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (46th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated
9.9EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.9Exploit: No code on recordExposed services: Not assessed

Upgrade to LXD version 4.0.12 or later, 5.0.4 or later, or 5.12.2 or later, or 6.0 or later (from the CVE record's solution, Canonical Ltd.) — apply it.

A path traversal vulnerability in LXD allows an attacker to manipulate file system paths during backup import and restore operations. When importing or restoring a backup archive, LXD fails to validate instance and storage volume names contained within the archive metadata. An attacker can exploit this flaw by supplying a crafted backup archive with malicious instance or volume names containing path traversal sequences, potentially allowing file access or overwriting outside the designated restore directory.

CVSS v3
9.9
EG Score
9.9CRITICALmedium confidence
EG Risk
61
EG Risk 61/100

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 (value × EchelonGraph’s weight)
Severity99% × 45%
The EG Score, 9.9 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: Upgrade to LXD version 4.0.12 or later, 5.0.4 or later, or 5.12.2 or later, or 6.0 or later (from the CVE record's solution, Canonical Ltd.). Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
46th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

Upgrade to LXD version 4.0.12 or later, 5.0.4 or later, or 5.12.2 or later, or 6.0 or later (from the CVE record's solution, Canonical Ltd.). Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 12, 2026

Last Modified

September 11, 2026

Advisory Details (1)

Auto-updated Oct 9, 2026
Fix named in the CVE record's solution (Canonical Ltd.). Sources: github.
GitHub advisoryMentions a patch (unverified)

Path traversal via unvalidated instance name in backup tarball restore enables root file write / RCE · Advisory · canonical/lxd · GitHub

https://github.com/canonical/lxd/security/advisories/GHSA-m857-c7gc-c984

Affected Packages

(2 across 2 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
lxd5.0.2+git20231211.1364ae4-1 ... 5.0.2-6 (17 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
lxd5.0.2+git20231211.1364ae4-9 ... 5.0.2+git20231211.1364ae4-9+deb13u7 (8 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 49× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 110 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 10 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 09:26 UTCEG score recompute
  2. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  3. 2026-10-13 06:57 UTCEG score recompute
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  5. 2026-10-12 15:46 UTCEG score recompute
  6. 2026-10-11 19:31 UTCEG score recompute
  7. 2026-10-11 16:46 UTCEG score recompute
  8. 2026-10-11 14:07 UTCEG score recompute
  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  14. 2026-10-06 18:06 UTCEG score recompute
  15. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  16. 2026-10-05 18:59 UTCEG score recompute
  17. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  18. 2026-10-05 02:33 UTCEG score recompute
  19. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  20. 2026-10-03 19:55 UTCEG score recompute
  21. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  22. 2026-10-02 21:58 UTCEG score recompute
  23. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  24. 2026-10-02 08:18 UTCEG score recompute
  25. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 46th percentile
Show 75 more
  1. 2026-09-30 21:53 UTCEG score recompute
  2. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  3. 2026-09-29 04:28 UTCEG score recompute
  4. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  5. 2026-09-27 16:52 UTCEG score recompute
  6. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  7. 2026-09-27 09:52 UTCEG score recompute
  8. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  9. 2026-09-25 03:39 UTCEG score recompute
  10. 2026-09-23 20:53 UTCEG score recompute
  11. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  12. 2026-09-22 21:05 UTCEG score recompute
  13. 2026-09-22 00:17 UTCEG score recompute
  14. 2026-09-20 20:16 UTCEG score recompute
  15. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  16. 2026-09-19 16:22 UTCEG score recompute
  17. 2026-09-18 22:47 UTCEG score recompute
  18. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  19. 2026-09-17 22:28 UTCEG score recompute
  20. 2026-09-17 00:17 UTCEG score recompute
  21. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  22. 2026-09-16 05:51 UTCEG score recompute
  23. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  24. 2026-09-15 06:23 UTCEG score recompute
  25. 2026-09-13 19:26 UTCEG score recompute
  26. 2026-09-12 15:48 UTCEG score recompute
  27. 2026-09-11 15:33 UTCEG score recompute
  28. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  29. 2026-09-11 09:43 UTCEG score recompute
  30. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  31. 2026-09-10 09:46 UTCEG score recompute
  32. 2026-09-09 05:11 UTCEG score recompute
  33. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  34. 2026-09-07 16:40 UTCEG score recompute
  35. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  36. 2026-09-06 17:34 UTCEG score recompute
  37. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  38. 2026-09-05 17:46 UTCEG score recompute
  39. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  40. 2026-09-04 15:49 UTCEG score recompute
  41. 2026-09-04 07:53 UTCEG score recompute
  42. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  43. 2026-09-02 23:26 UTCEG score recompute
  44. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  45. 2026-09-01 16:29 UTCEG score recompute
  46. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  47. 2026-09-01 06:22 UTCEG score recompute
  48. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  49. 2026-08-30 20:18 UTCEG score recompute
  50. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  51. 2026-08-30 04:30 UTCEG score recompute
  52. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  53. 2026-08-29 08:31 UTCEG score recompute
  54. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  55. 2026-08-27 15:15 UTCEG score recompute
  56. 2026-08-26 18:48 UTCEG score recompute
  57. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  58. 2026-08-25 17:28 UTCEG score recompute
  59. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  60. 2026-08-24 17:16 UTCEG score recompute
  61. 2026-08-24 13:06 UTCEG score recompute
  62. 2026-08-23 01:36 UTCEG score recompute
  63. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  64. 2026-08-22 01:51 UTCEG score recompute
  65. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  66. 2026-08-21 02:08 UTCEG score recompute
  67. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  68. 2026-08-19 18:34 UTCEG score recompute
  69. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  70. 2026-08-18 17:15 UTCEG score recompute
  71. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  72. 2026-08-17 17:13 UTCEG score recompute
  73. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  74. 2026-08-16 17:21 UTCEG score recompute
  75. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 27th percentile

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-66898?
CVE-2026-66898 is a critical-severity vulnerability; its CVE record was published on August 12, 2026. A path traversal vulnerability in LXD allows an attacker to manipulate file system paths during backup import and restore operations. When importing or restoring a backup archive, LXD fails to validate instance and storage volume names contained within the archive metadata. An attacker can exploit…
When was the CVE record for CVE-2026-66898 published?
The CVE record for CVE-2026-66898 was published on August 12, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 11, 2026; the record at its source may have been updated since.
Is CVE-2026-66898 actively exploited?
CVE-2026-66898 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (46th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-66898?
CVE-2026-66898 has a CVSS base score of 9.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-66898?
The CVE record's solution for CVE-2026-66898, written by its CNA Canonical Ltd., names the fix: "Upgrade to LXD version 4.0.12 or later, 5.0.4 or later, or 5.12.2 or later, or 6.0 or later."

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-66898

Explore →

Is Your Infrastructure Affected by CVE-2026-66898?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs