CVE-2026-56117

MEDIUMNVD 5.54.7▼
EchelonGraph scoreHIGH confidence

Score 4.7 from GitHub Security Advisory published 2026-06-23. NVD baseline CVSS 5.5; sources differ by 0.8.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.5Exploit: NoneExposed: 0

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

dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a heap use-after-free vulnerability in the control socket handling within src/control.c that allows local unprivileged attackers to trigger memory corruption when privilege separation is disabled. Attackers can connect to the control socket and send a privileged command such as -x, causing control_recvdata() to free the client object while the same READ+HANGUP event subsequently reaches control_hangup() with the stale pointer, resulting in a use-after-free condition exploitable in deployments using --disable-privsep or where privsep initialization has failed with the control socket operating in mode 0666.

CVSS v3
5.5
EG Score
4.7(high)
EPSS
0.7%
KEV
Not listed

Published

June 23, 2026

Last Modified

June 28, 2026

Advisory Details (2)

Auto-updated Jun 23, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

dhcpcd Heap Use-After-Free via Control Socket Handling | Advisories | VulnCheck

https://www.vulncheck.com/advisories/dhcpcd-heap-use-after-free-via-control-socket-handling
github_commit

commit 78ea09ed1633 (NetworkConfiguration/dhcpcd)

Fix landed in NetworkConfiguration/dhcpcd commit 78ea09ed1633 — awaiting tagged release

https://github.com/NetworkConfiguration/dhcpcd/commit/78ea09ed1633a583dbcde6e7bab9df4639ec8a34

Vendor Advisories for CVE-2026-56117(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 23× in last 7d / 46× 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. 2026-07-06 18:42 UTCEG score recompute
  2. 2026-07-06 18:42 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 18:36 UTCEG score recompute
  8. 2026-07-05 18:36 UTCGHSA enrichment
  9. 2026-07-05 02:31 UTCEPSS rescore
  10. 2026-07-05 02:30 UTCEPSS rescore
  11. 2026-07-04 18:33 UTCEG score recompute
  12. 2026-07-04 18:33 UTCGHSA enrichment
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-03 18:28 UTCEG score recompute
  16. 2026-07-03 18:28 UTCGHSA enrichment
  17. 2026-07-02 18:25 UTCEG score recompute
  18. 2026-07-02 18:25 UTCGHSA enrichment
  19. 2026-07-01 18:22 UTCEG score recompute
  20. 2026-07-01 18:21 UTCGHSA enrichment
  21. 2026-07-01 15:07 UTCEPSS rescore
  22. 2026-06-30 18:18 UTCEG score recompute
  23. 2026-06-30 18:18 UTCGHSA enrichment
  24. 2026-06-29 18:14 UTCEG score recompute
  25. 2026-06-29 18:14 UTCGHSA enrichment
Show 21 more
  1. 2026-06-29 14:06 UTCEPSS rescore
  2. 2026-06-29 14:06 UTCEPSS rescore
  3. 2026-06-28 18:07 UTCEG score recompute
  4. 2026-06-28 18:06 UTCGHSA enrichment
  5. 2026-06-28 14:07 UTCEPSS rescore
  6. 2026-06-28 04:56 UTCEPSS rescore
  7. 2026-06-28 04:56 UTCEPSS rescore
  8. 2026-06-28 01:44 UTCNVD updateCVSS v3 → 5.5
  9. 2026-06-27 18:01 UTCEG score recompute
  10. 2026-06-27 18:01 UTCGHSA enrichment
  11. 2026-06-27 03:08 UTCEPSS rescore
  12. 2026-06-26 17:58 UTCEG score recompute
  13. 2026-06-26 17:58 UTCGHSA enrichment
  14. 2026-06-25 17:55 UTCEG score recompute
  15. 2026-06-25 17:55 UTCGHSA enrichment
  16. 2026-06-25 13:49 UTCEPSS rescore
  17. 2026-06-24 17:46 UTCEG score recompute
  18. 2026-06-24 17:45 UTCGHSA enrichment
  19. 2026-06-24 14:05 UTCEPSS rescore
  20. 2026-06-23 17:35 UTCEG score recompute
  21. 2026-06-23 17:34 UTCNVD updatefirst tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56117?
CVE-2026-56117 is a medium vulnerability published on June 23, 2026. dhcpcd through 10.3.2, fixed in commit 78ea09e, contains a heap use-after-free vulnerability in the control socket handling within src/control.c that allows local unprivileged attackers to trigger memory corruption when privilege separation is disabled. Attackers can connect to the control socket…
When was CVE-2026-56117 disclosed?
CVE-2026-56117 was first published in the National Vulnerability Database on June 23, 2026, with the most recent update on June 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56117 actively exploited?
CVE-2026-56117 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56117?
CVE-2026-56117 has a CVSS v3 base score of 5.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 4.7.
How do I remediate CVE-2026-56117?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56117, 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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