CVE-2026-46433

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 87% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 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.

lldpd is an implementation of IEEE 802.1ab (LLDP). Prior to version 1.0.22, lldpd_decode() in src/daemon/lldpd.c strips 802.1Q VLAN tags from received Ethernet frames by calling memmove() to shift the frame payload 4 bytes left. The third argument (byte count) is s - 2 * ETHER_ADDR_LEN but should be s - 2 * ETHER_ADDR_LEN - 4, causing a 4-byte heap buffer over-read past the malloc(h_mtu) allocation when the received frame size equals the interface MTU. This issue has been patched in version 1.0.22.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 23, 2026

Advisory Details (4)

Auto-updated Jun 16, 2026
Patch available. Sources: github_release, github, github_commit, github_pr.
github Patch Available

Heap OOB Read in VLAN Decapsulation memmove · Advisory · lldpd/lldpd · GitHub

https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3
github_release Patch Available

1.0.22

Patch available: lldpd/lldpd 1.0.22

https://github.com/lldpd/lldpd/releases/tag/1.0.22
github_pr Patch Available

Fix heap OOB read in VLAN decapsulation memmove

Patch available: lldpd/lldpd 1.0.22 (PR #787 merged 2026-05-12)

https://github.com/lldpd/lldpd/pull/787
github_commit Patch Available

commit ca931be63a9c (lldpd/lldpd)

Patch available: lldpd/lldpd 1.0.22 (contains commit ca931be63a9c)

https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6

Vendor Advisories for CVE-2026-46433(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
lldpd1.0.11-1 ... 1.0.22-1 (13 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
lldpd1.0.16-1 ... 1.0.22-1 (7 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
lldpd1.0.18-1, 1.0.19-1, 1.0.21-1, 1.0.22-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
lldpd1.0.18-1, 1.0.19-1, 1.0.21-11.0.22-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 37× 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 174 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-46433?
CVE-2026-46433 is a medium vulnerability published on June 9, 2026. lldpd is an implementation of IEEE 802.1ab (LLDP). Prior to version 1.0.22, lldpddecode() in src/daemon/lldpd.c strips 802.1Q VLAN tags from received Ethernet frames by calling memmove() to shift the frame payload 4 bytes left. The third argument (byte count) is s - 2 * ETHERADDRLEN but should be s…
When was CVE-2026-46433 disclosed?
CVE-2026-46433 was first published in the National Vulnerability Database on June 9, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-46433 actively exploited?
CVE-2026-46433 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 86.7% of all scored CVEs.
What is the CVSS score of CVE-2026-46433?
CVE-2026-46433 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-46433?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-46433, 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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