CVE-2026-56116

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-23. the CNA's CVSS baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
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
21%
KEV
Not listed

Published

June 23, 2026

Last Modified

July 28, 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.

Affected Packages

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
dhcpcd1:10.1.0-11, 1:10.1.0-11+deb13u1, 1:10.1.0-11+deb13u21:10.1.0-11+deb13u3—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
dhcpcd1:10.1.0-11 ... 1:10.3.2-4~bpo13+1 (37 versions)1:10.3.2-4—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 57× 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.

Showing the most recent 100 of 211 total refreshes for this CVE.

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

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 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56116 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 78.8% of all scored CVEs.
What is the CVSS score of CVE-2026-56116?
CVE-2026-56116 has a CVSS v4.0 base score of 6.5 (CNA self-assessment; NVD's own analysis pending).
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.

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