CVE-2026-29004

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-05-04. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

A fix is available — apply it.

BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

May 4, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated May 4, 2026
No patch confirmed yet.
generic

BusyBox DHCPv6 Client Heap Buffer Overflow via DNS_SERVERS | Advisories | VulnCheck

https://www.vulncheck.com/advisories/busybox-dhcpv6-client-heap-buffer-overflow-via-dns-servers
generic

udhcpc6: check the size of D6_OPT_IAPREFIX option · vda-linux/busybox_mirror@d368f3f · GitHub

https://github.com/vda-linux/busybox_mirror/commit/d368f3f7836d1c2484c8f839316e5c93e76d4409
generic

udhcpc6: fix buffer overflow · vda-linux/busybox_mirror@42202bf · GitHub

https://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2a
generic

BusyBox

https://busybox.net/

Vendor Advisories for CVE-2026-29004(2)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatbusybox-main-1.37.0-7.3.hum12026-06-28redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
busybox1:1.30.1-6 ... 1:1.38.0-3 (35 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
busybox1:1.35.0-4 ... 1:1.38.0-3 (28 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
busybox1:1.37.0-10 ... 1:1.38.0-3 (9 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
busybox1:1.37.0-10 ... 1:1.38.0-3 (9 versions)——

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 33× 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 258 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-29004?
CVE-2026-29004 is a high vulnerability published on May 4, 2026. BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNSSERVERS option handler in networking/udhcp/d6dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed…
When was CVE-2026-29004 disclosed?
CVE-2026-29004 was first published in the National Vulnerability Database on May 4, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-29004 actively exploited?
CVE-2026-29004 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 68.6% of all scored CVEs.
What is the CVSS score of CVE-2026-29004?
CVE-2026-29004 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-29004?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-29004, 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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