CVE-2026-56116

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM 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
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 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(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

June 23, 2026

Last Modified

July 14, 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 10× in last 7d / 83× 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. 2026-07-26 15:53 UTCEG score recompute
  2. 2026-07-26 15:53 UTCVendor advisory
  3. 2026-07-26 15:53 UTCGHSA enrichment
  4. 2026-07-26 14:54 UTCEPSS rescore
  5. 2026-07-25 14:18 UTCEPSS rescore
  6. 2026-07-24 14:18 UTCEPSS rescore
  7. 2026-07-23 14:18 UTCEPSS rescore
  8. 2026-07-23 03:20 UTCEG score recompute
  9. 2026-07-22 14:08 UTCEPSS rescore
  10. 2026-07-21 15:25 UTCEPSS rescore
  11. 2026-07-20 17:08 UTCEPSS rescore
  12. 2026-07-19 14:31 UTCEPSS rescore
  13. 2026-07-19 14:31 UTCEPSS rescore
  14. 2026-07-19 02:29 UTCEPSS rescore
  15. 2026-07-18 10:04 UTCEPSS rescore
  16. 2026-07-17 06:29 UTCVendor advisory
  17. 2026-07-17 06:29 UTCGHSA enrichment
  18. 2026-07-16 17:03 UTCEPSS rescore
  19. 2026-07-16 06:59 UTCVendor advisory
  20. 2026-07-16 06:59 UTCGHSA enrichment
  21. 2026-07-15 16:57 UTCEPSS rescore
  22. 2026-07-15 16:57 UTCEPSS rescore
  23. 2026-07-15 07:04 UTCVendor advisory
  24. 2026-07-15 07:04 UTCGHSA enrichment
  25. 2026-07-15 02:00 UTCEPSS rescore
Show 67 more
  1. 2026-07-15 02:00 UTCEPSS rescore
  2. 2026-07-14 07:36 UTCVendor advisory
  3. 2026-07-14 07:35 UTCGHSA enrichment
  4. 2026-07-13 22:31 UTCEPSS rescore
  5. 2026-07-13 08:05 UTCGHSA enrichment
  6. 2026-07-13 06:13 UTCEPSS rescore
  7. 2026-07-13 06:13 UTCEPSS rescore
  8. 2026-07-12 08:35 UTCVendor advisory
  9. 2026-07-12 08:35 UTCGHSA enrichment
  10. 2026-07-12 05:46 UTCEPSS rescore
  11. 2026-07-11 09:07 UTCVendor advisory
  12. 2026-07-11 09:07 UTCGHSA enrichment
  13. 2026-07-11 08:27 UTCEPSS rescore
  14. 2026-07-11 08:27 UTCEPSS rescore
  15. 2026-07-10 09:39 UTCVendor advisory
  16. 2026-07-10 09:39 UTCGHSA enrichment
  17. 2026-07-09 19:10 UTCEPSS rescore
  18. 2026-07-09 19:10 UTCEPSS rescore
  19. 2026-07-09 10:00 UTCVendor advisory
  20. 2026-07-09 10:00 UTCGHSA enrichment
  21. 2026-07-08 15:16 UTCEPSS rescore
  22. 2026-07-08 15:16 UTCEPSS rescore
  23. 2026-07-08 10:32 UTCVendor advisory
  24. 2026-07-08 10:31 UTCGHSA enrichment
  25. 2026-07-07 13:46 UTCEPSS rescore
  26. 2026-07-07 13:46 UTCEPSS rescore
  27. 2026-07-07 11:04 UTCVendor advisory
  28. 2026-07-07 11:04 UTCGHSA enrichment
  29. 2026-07-06 16:27 UTCEPSS rescore
  30. 2026-07-06 16:27 UTCEPSS rescore
  31. 2026-07-06 11:23 UTCVendor advisory
  32. 2026-07-06 11:23 UTCGHSA enrichment
  33. 2026-07-06 02:23 UTCEPSS rescore
  34. 2026-07-06 02:23 UTCEPSS rescore
  35. 2026-07-05 11:48 UTCVendor advisory
  36. 2026-07-05 11:48 UTCGHSA enrichment
  37. 2026-07-05 02:31 UTCEPSS rescore
  38. 2026-07-05 02:30 UTCEPSS rescore
  39. 2026-07-04 12:20 UTCVendor advisory
  40. 2026-07-04 12:20 UTCGHSA enrichment
  41. 2026-07-04 06:31 UTCEPSS rescore
  42. 2026-07-04 06:31 UTCEPSS rescore
  43. 2026-07-03 12:53 UTCVendor advisory
  44. 2026-07-03 12:53 UTCGHSA enrichment
  45. 2026-07-02 12:51 UTCVendor advisory
  46. 2026-07-02 12:51 UTCGHSA enrichment
  47. 2026-07-01 15:07 UTCEPSS rescore
  48. 2026-07-01 13:23 UTCVendor advisory
  49. 2026-07-01 13:23 UTCGHSA enrichment
  50. 2026-06-30 23:22 UTCEPSS rescore
  51. 2026-06-30 13:55 UTCGHSA enrichment
  52. 2026-06-29 14:26 UTCGHSA enrichment
  53. 2026-06-29 14:06 UTCEPSS rescore
  54. 2026-06-29 14:06 UTCEPSS rescore
  55. 2026-06-28 14:57 UTCGHSA enrichment
  56. 2026-06-28 14:07 UTCEPSS rescore
  57. 2026-06-28 04:56 UTCEPSS rescore
  58. 2026-06-28 04:56 UTCEPSS rescore
  59. 2026-06-27 15:29 UTCGHSA enrichment
  60. 2026-06-27 03:08 UTCEPSS rescore
  61. 2026-06-26 16:01 UTCGHSA enrichment
  62. 2026-06-25 16:33 UTCGHSA enrichment
  63. 2026-06-25 13:49 UTCEPSS rescore
  64. 2026-06-24 17:04 UTCGHSA enrichment
  65. 2026-06-24 14:05 UTCEPSS rescore
  66. 2026-06-23 17:35 UTCEG score recompute
  67. 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 14, 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 0% probability of exploitation in the next 30 days, which ranks it in the top 91.3% of all scored CVEs.
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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