CVE-2026-12039

MEDIUMPre-NVD 5.75.7—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1%, top 99% 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
Trending — 3 sources updated this week
5.7
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.7Exploit: NoneExposed: 0

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

Docker Sandboxes (sbx) enforces an HTTP/S-only egress allowlist but does not apply it to DNS resolution: the per-network embedded DNS server forwards any queried name to the host resolver whenever the network is internet-connected, without consulting the policy. A workload inside a sandbox, which the threat model treats as untrusted, can therefore encode data into DNS labels for an attacker-controlled domain and exfiltrate it through a DNS covert channel, bypassing the configured allowlist.

CVSS v3
5.7
EG Score
5.7(medium)
EPSS
1.2%
KEV
Not listed

Published

June 18, 2026

Last Modified

June 30, 2026

Advisory Details (2)

Auto-updated Jun 20, 2026
Patch available. Sources: github_release.
github_release Patch Available

v0.33.0

Patch available: docker/sbx-releases v0.33.0

https://github.com/docker/sbx-releases/releases/tag/v0.33.0
generic

Docker Sandboxes | Docker Docs

https://docs.docker.com/ai/sandboxes/

Vendor Advisories for CVE-2026-12039(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 51× 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. 2026-07-07 08:15 UTCEG score recompute
  2. 2026-07-07 08:15 UTCGHSA enrichment
  3. 2026-07-06 05:05 UTCEG score recompute
  4. 2026-07-06 05:05 UTCGHSA enrichment
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-05 03:07 UTCEG score recompute
  7. 2026-07-05 03:07 UTCGHSA enrichment
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-05 02:30 UTCEPSS rescore
  10. 2026-07-04 06:31 UTCEPSS rescore
  11. 2026-07-04 01:10 UTCEG score recompute
  12. 2026-07-04 01:09 UTCGHSA enrichment
  13. 2026-07-02 23:12 UTCEG score recompute
  14. 2026-07-02 23:12 UTCGHSA enrichment
  15. 2026-07-01 21:14 UTCEG score recompute
  16. 2026-07-01 21:14 UTCGHSA enrichment
  17. 2026-07-01 15:06 UTCEPSS rescore
  18. 2026-07-01 15:06 UTCEPSS rescore
  19. 2026-06-30 23:22 UTCEPSS rescore
  20. 2026-06-30 19:17 UTCEG score recompute
  21. 2026-06-30 19:17 UTCGHSA enrichment
  22. 2026-06-29 17:20 UTCEG score recompute
  23. 2026-06-29 17:19 UTCGHSA enrichment
  24. 2026-06-28 15:21 UTCEG score recompute
  25. 2026-06-28 15:21 UTCGHSA enrichment
Show 26 more
  1. 2026-06-28 14:07 UTCEPSS rescore
  2. 2026-06-28 04:56 UTCEPSS rescore
  3. 2026-06-28 04:56 UTCEPSS rescore
  4. 2026-06-27 13:23 UTCEG score recompute
  5. 2026-06-27 13:23 UTCGHSA enrichment
  6. 2026-06-27 03:08 UTCEPSS rescore
  7. 2026-06-26 11:26 UTCEG score recompute
  8. 2026-06-26 11:26 UTCGHSA enrichment
  9. 2026-06-25 05:14 UTCEG score recompute
  10. 2026-06-25 05:14 UTCGHSA enrichment
  11. 2026-06-24 03:16 UTCEG score recompute
  12. 2026-06-24 03:16 UTCGHSA enrichment
  13. 2026-06-23 21:32 UTCEPSS rescore
  14. 2026-06-23 01:17 UTCEG score recompute
  15. 2026-06-23 01:17 UTCGHSA enrichment
  16. 2026-06-21 23:20 UTCEG score recompute
  17. 2026-06-21 23:20 UTCGHSA enrichment
  18. 2026-06-20 21:21 UTCEG score recompute
  19. 2026-06-20 21:21 UTCGHSA enrichment
  20. 2026-06-19 19:23 UTCEG score recompute
  21. 2026-06-19 19:23 UTCGHSA enrichment
  22. 2026-06-18 17:24 UTCEG score recompute▲ 5.70
  23. 2026-06-18 17:24 UTCGHSA enrichment
  24. 2026-06-18 17:22 UTCNVD updateCVSS v3 → 5.7 · CVSS v4 → 5.7
  25. 2026-06-18 15:45 UTCEG score recompute
  26. 2026-06-18 15:45 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-12039?
CVE-2026-12039 is a medium vulnerability published on June 18, 2026. Docker Sandboxes (sbx) enforces an HTTP/S-only egress allowlist but does not apply it to DNS resolution: the per-network embedded DNS server forwards any queried name to the host resolver whenever the network is internet-connected, without consulting the policy. A workload inside a sandbox, which…
When was CVE-2026-12039 disclosed?
CVE-2026-12039 was first published in the National Vulnerability Database on June 18, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12039 actively exploited?
CVE-2026-12039 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-12039?
CVE-2026-12039 has a CVSS v3 base score of 5.7 (NVD).
How do I remediate CVE-2026-12039?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12039, 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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