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 6× in last 7d / 35× 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 253 total refreshes for this CVE.

  1. 2026-09-13 16:47 UTCEPSS rescore
  2. 2026-09-12 15:01 UTCEPSS rescore
  3. 2026-09-11 17:40 UTCOSV refresh
  4. 2026-09-11 14:52 UTCEPSS rescore
  5. 2026-09-10 09:34 UTCEPSS rescore
  6. 2026-09-08 22:00 UTCEPSS rescore
  7. 2026-09-07 16:01 UTCEPSS rescore
  8. 2026-09-06 13:47 UTCEPSS rescore
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-04 05:06 UTCEPSS rescore
  11. 2026-09-02 14:11 UTCEPSS rescore
  12. 2026-09-01 13:53 UTCEPSS rescore
  13. 2026-09-01 04:39 UTCEPSS rescore
  14. 2026-09-01 04:39 UTCEPSS rescore
  15. 2026-08-30 19:17 UTCEPSS rescore
  16. 2026-08-30 01:22 UTCEPSS rescore
  17. 2026-08-28 21:41 UTCEPSS rescore
  18. 2026-08-27 14:25 UTCEPSS rescore
  19. 2026-08-26 14:46 UTCEPSS rescore
  20. 2026-08-25 13:49 UTCEPSS rescore
  21. 2026-08-24 14:17 UTCEPSS rescore
  22. 2026-08-23 21:17 UTCEG score recompute
  23. 2026-08-23 21:17 UTCVendor advisory
  24. 2026-08-23 21:17 UTCGHSA enrichment
  25. 2026-08-23 00:19 UTCEPSS rescore
Show 75 more
  1. 2026-08-21 23:49 UTCEPSS rescore
  2. 2026-08-20 22:55 UTCEPSS rescore
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-18 13:48 UTCEPSS rescore
  6. 2026-08-17 13:47 UTCEPSS rescore
  7. 2026-08-17 13:11 UTCEG score recompute
  8. 2026-08-17 13:11 UTCVendor advisory
  9. 2026-08-17 13:11 UTCGHSA enrichment
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-16 05:03 UTCEG score recompute
  12. 2026-08-16 05:03 UTCVendor advisory
  13. 2026-08-16 05:03 UTCGHSA enrichment
  14. 2026-08-16 02:14 UTCEPSS rescore
  15. 2026-08-15 01:30 UTCEPSS rescore
  16. 2026-08-15 01:20 UTCVendor advisory
  17. 2026-08-15 01:20 UTCGHSA enrichment
  18. 2026-08-14 14:30 UTCVendor advisory
  19. 2026-08-14 14:30 UTCGHSA enrichment
  20. 2026-08-14 03:38 UTCEG score recompute
  21. 2026-08-14 03:38 UTCVendor advisory
  22. 2026-08-14 03:38 UTCGHSA enrichment
  23. 2026-08-13 22:00 UTCEPSS rescore
  24. 2026-08-13 04:06 UTCVendor advisory
  25. 2026-08-13 04:06 UTCGHSA enrichment
  26. 2026-08-12 17:16 UTCEG score recompute
  27. 2026-08-12 17:16 UTCVendor advisory
  28. 2026-08-12 17:16 UTCGHSA enrichment
  29. 2026-08-12 13:50 UTCEPSS rescore
  30. 2026-08-11 16:08 UTCEG score recompute
  31. 2026-08-11 16:08 UTCVendor advisory
  32. 2026-08-11 16:08 UTCGHSA enrichment
  33. 2026-08-11 13:42 UTCEPSS rescore
  34. 2026-08-11 01:40 UTCEG score recompute
  35. 2026-08-11 01:40 UTCVendor advisory
  36. 2026-08-11 01:40 UTCGHSA enrichment
  37. 2026-08-11 00:00 UTCEPSS rescore
  38. 2026-08-10 11:47 UTCVendor advisory
  39. 2026-08-10 11:47 UTCGHSA enrichment
  40. 2026-08-10 00:25 UTCEG score recompute
  41. 2026-08-10 00:25 UTCVendor advisory
  42. 2026-08-10 00:25 UTCGHSA enrichment
  43. 2026-08-09 13:46 UTCEPSS rescore
  44. 2026-08-09 13:34 UTCVendor advisory
  45. 2026-08-09 13:34 UTCGHSA enrichment
  46. 2026-08-09 02:44 UTCEG score recompute
  47. 2026-08-09 02:44 UTCVendor advisory
  48. 2026-08-09 02:44 UTCGHSA enrichment
  49. 2026-08-08 16:37 UTCEPSS rescore
  50. 2026-08-08 09:03 UTCVendor advisory
  51. 2026-08-08 09:03 UTCGHSA enrichment
  52. 2026-08-07 22:13 UTCEG score recompute
  53. 2026-08-07 22:13 UTCVendor advisory
  54. 2026-08-07 22:13 UTCGHSA enrichment
  55. 2026-08-07 11:23 UTCVendor advisory
  56. 2026-08-07 11:22 UTCGHSA enrichment
  57. 2026-08-06 20:10 UTCEG score recompute
  58. 2026-08-06 20:10 UTCVendor advisory
  59. 2026-08-06 20:10 UTCGHSA enrichment
  60. 2026-08-06 13:46 UTCEPSS rescore
  61. 2026-08-06 09:20 UTCVendor advisory
  62. 2026-08-06 09:20 UTCGHSA enrichment
  63. 2026-08-05 22:29 UTCEG score recompute
  64. 2026-08-05 22:29 UTCVendor advisory
  65. 2026-08-05 22:29 UTCGHSA enrichment
  66. 2026-08-05 19:17 UTCEPSS rescore
  67. 2026-08-04 15:10 UTCEPSS rescore
  68. 2026-08-03 20:02 UTCEG score recompute
  69. 2026-08-03 20:02 UTCVendor advisory
  70. 2026-08-03 20:02 UTCGHSA enrichment
  71. 2026-08-03 10:36 UTCEPSS rescore
  72. 2026-08-03 04:54 UTCVendor advisory
  73. 2026-08-03 04:54 UTCGHSA enrichment
  74. 2026-08-02 16:21 UTCVendor advisory
  75. 2026-08-02 16:21 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 69.0% 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-29004

Explore →

Is Your Infrastructure Affected by CVE-2026-29004?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs