CVE-2026-56116

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-23. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: 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 708b4a5, contains a memory leak vulnerability in the IPv6 Router Advertisement route information handling that allows an unauthenticated same-link attacker to cause denial of service by sending crafted Router Advertisements. Attackers can repeatedly send Router Advertisements containing Route Information options with a lifetime of zero, triggering unfreed allocations in routeinfo_findalloc() that cause linear memory exhaustion and eventual daemon crash.

CVSS v3
6.5
EG Score
6.5(high)
EPSS
8.5%
KEV
Not listed

Published

June 23, 2026

Last Modified

July 1, 2026

Advisory Details (2)

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

dhcpcd Memory Leak DoS via IPv6 Router Advertisement Handling | Advisories | VulnCheck

https://www.vulncheck.com/advisories/dhcpcd-memory-leak-dos-via-ipv6-router-advertisement-handling
github_commit

commit 708b4a56bae0 (NetworkConfiguration/dhcpcd)

Fix landed in NetworkConfiguration/dhcpcd commit 708b4a56bae0 — awaiting tagged release

https://github.com/NetworkConfiguration/dhcpcd/commit/708b4a56bae080a5b18c2e0c4c6fbe103131a2b0

Vendor Advisories for CVE-2026-56116(2)

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 30× in last 7d / 52× 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 16:27 UTCEPSS rescore
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 11:23 UTCEG score recompute
  4. 2026-07-06 11:23 UTCVendor advisory
  5. 2026-07-06 11:23 UTCGHSA enrichment
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-05 11:48 UTCEG score recompute
  9. 2026-07-05 11:48 UTCVendor advisory
  10. 2026-07-05 11:48 UTCGHSA enrichment
  11. 2026-07-05 02:31 UTCEPSS rescore
  12. 2026-07-05 02:30 UTCEPSS rescore
  13. 2026-07-04 12:20 UTCEG score recompute
  14. 2026-07-04 12:20 UTCVendor advisory
  15. 2026-07-04 12:20 UTCGHSA enrichment
  16. 2026-07-04 06:31 UTCEPSS rescore
  17. 2026-07-04 06:31 UTCEPSS rescore
  18. 2026-07-03 12:53 UTCEG score recompute
  19. 2026-07-03 12:53 UTCVendor advisory
  20. 2026-07-03 12:53 UTCGHSA enrichment
  21. 2026-07-02 12:51 UTCEG score recompute
  22. 2026-07-02 12:51 UTCVendor advisory
  23. 2026-07-02 12:51 UTCGHSA enrichment
  24. 2026-07-01 15:07 UTCEPSS rescore
  25. 2026-07-01 13:23 UTCEG score recompute
Show 27 more
  1. 2026-07-01 13:23 UTCVendor advisory
  2. 2026-07-01 13:23 UTCGHSA enrichment
  3. 2026-06-30 23:22 UTCEPSS rescore
  4. 2026-06-30 13:56 UTCEG score recompute
  5. 2026-06-30 13:55 UTCGHSA enrichment
  6. 2026-06-29 14:26 UTCEG score recompute
  7. 2026-06-29 14:26 UTCGHSA enrichment
  8. 2026-06-29 14:06 UTCEPSS rescore
  9. 2026-06-29 14:06 UTCEPSS rescore
  10. 2026-06-28 14:57 UTCEG score recompute
  11. 2026-06-28 14:57 UTCGHSA enrichment
  12. 2026-06-28 14:07 UTCEPSS rescore
  13. 2026-06-28 04:56 UTCEPSS rescore
  14. 2026-06-28 04:56 UTCEPSS rescore
  15. 2026-06-27 15:29 UTCEG score recompute
  16. 2026-06-27 15:29 UTCGHSA enrichment
  17. 2026-06-27 03:08 UTCEPSS rescore
  18. 2026-06-26 16:01 UTCEG score recompute
  19. 2026-06-26 16:01 UTCGHSA enrichment
  20. 2026-06-25 16:33 UTCEG score recompute
  21. 2026-06-25 16:33 UTCGHSA enrichment
  22. 2026-06-25 13:49 UTCEPSS rescore
  23. 2026-06-24 17:04 UTCEG score recompute
  24. 2026-06-24 17:04 UTCGHSA enrichment
  25. 2026-06-24 14:05 UTCEPSS rescore
  26. 2026-06-23 17:35 UTCEG score recompute
  27. 2026-06-23 17:34 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-56116?
CVE-2026-56116 is a medium vulnerability published on June 23, 2026. dhcpcd through 10.3.2, fixed in commit 708b4a5, contains a memory leak vulnerability in the IPv6 Router Advertisement route information handling that allows an unauthenticated same-link attacker to cause denial of service by sending crafted Router Advertisements. Attackers can repeatedly send…
When was CVE-2026-56116 disclosed?
CVE-2026-56116 was first published in the National Vulnerability Database on June 23, 2026, with the most recent update on July 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56116 actively exploited?
CVE-2026-56116 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 8.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56116?
CVE-2026-56116 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-56116?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56116, 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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