CVE-2026-8836

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-18. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be initiated remotely. The patch is named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. It is suggested to install a patch to address this issue. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
74%
KEV
Not listed

Published

May 18, 2026

Last Modified

August 22, 2026

Advisory Details (2)

Auto-updated Sep 19, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
github_commit

commit 0c957ec03054 (lwip-tcpip/lwip)

Fix landed in lwip-tcpip/lwip commit 0c957ec03054 — awaiting tagged release

https://github.com/lwip-tcpip/lwip/commit/0c957ec03054eb6c8205e9c9d1d05d90ada3898c
generic

snmpv3: fix handling packets with invalid msgAuthenticationParameters length - lwip.git - lwIP - A Lightweight TCPIP stack

https://cgit.git.savannah.gnu.org/cgit/lwip.git/commit/?id=0c957ec03054eb6c8205e9c9d1d05d90ada3898c

Vendor Advisories for CVE-2026-8836(1)

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
ubuntuliblwip0t64 (2.2.0+dfsg1-6.1ubuntu0.1~esm1) @ noble2026-08-23ubuntu

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
lwip2.1.2+dfsg1-8 ... 2.2.1+dfsg1-6 (24 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
lwip2.1.3+dfsg1-2 ... 2.2.1+dfsg1-7 (21 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
lwip2.2.1+dfsg1-1 ... 2.2.1+dfsg1-7 (8 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
lwip2.2.1+dfsg1-1, 2.2.1+dfsg1-2, 2.2.1+dfsg1-3, 2.2.1+dfsg1-42.2.1+dfsg1-5—

Weakness Classification(2)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 5× in last 7d / 25× 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 450 total refreshes for this CVE.

  1. 2026-09-24 14:04 UTCEPSS rescore
  2. 2026-09-23 17:54 UTCEPSS rescore
  3. 2026-09-22 16:01 UTCEPSS rescore
  4. 2026-09-21 21:09 UTCEPSS rescore
  5. 2026-09-20 20:16 UTCEPSS rescore
  6. 2026-09-18 19:28 UTCEPSS rescore
  7. 2026-09-17 19:32 UTCEPSS rescore
  8. 2026-09-16 14:09 UTCEPSS rescore
  9. 2026-09-16 05:15 UTCEPSS rescore
  10. 2026-09-15 03:12 UTCEPSS rescore
  11. 2026-09-12 15:02 UTCEPSS rescore
  12. 2026-09-11 17:23 UTCOSV refresh
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-11 09:38 UTCEPSS rescore
  15. 2026-09-08 22:01 UTCEPSS rescore
  16. 2026-09-06 13:48 UTCEPSS rescore
  17. 2026-09-05 15:31 UTCEPSS rescore
  18. 2026-09-04 05:07 UTCEPSS rescore
  19. 2026-09-02 14:12 UTCEPSS rescore
  20. 2026-09-01 13:54 UTCEPSS rescore
  21. 2026-09-01 04:40 UTCEPSS rescore
  22. 2026-08-30 19:18 UTCEPSS rescore
  23. 2026-08-30 01:22 UTCEPSS rescore
  24. 2026-08-28 21:42 UTCEPSS rescore
  25. 2026-08-27 14:25 UTCEPSS rescore
Show 75 more
  1. 2026-08-26 14:47 UTCEPSS rescore
  2. 2026-08-25 13:49 UTCEPSS rescore
  3. 2026-08-24 14:18 UTCEPSS rescore
  4. 2026-08-23 21:11 UTCVendor advisory
  5. 2026-08-23 21:11 UTCGHSA enrichment
  6. 2026-08-23 17:13 UTCEG score recompute
  7. 2026-08-23 17:13 UTCVendor advisory
  8. 2026-08-23 17:13 UTCGHSA enrichment
  9. 2026-08-23 00:19 UTCEPSS rescore
  10. 2026-08-22 09:33 UTCVendor advisory
  11. 2026-08-22 09:33 UTCGHSA enrichment
  12. 2026-08-22 09:32 UTCNVD updateCVSS v4 → 8.9
  13. 2026-08-22 08:56 UTCGHSA enrichment
  14. 2026-08-21 23:53 UTCEG score recompute
  15. 2026-08-21 23:53 UTCVendor advisory
  16. 2026-08-21 23:53 UTCGHSA enrichment
  17. 2026-08-21 23:49 UTCEPSS rescore
  18. 2026-08-20 22:56 UTCEPSS rescore
  19. 2026-08-20 19:09 UTCEG score recompute
  20. 2026-08-20 19:09 UTCVendor advisory
  21. 2026-08-20 19:09 UTCGHSA enrichment
  22. 2026-08-19 17:04 UTCEPSS rescore
  23. 2026-08-18 13:49 UTCEPSS rescore
  24. 2026-08-18 13:49 UTCEPSS rescore
  25. 2026-08-17 13:54 UTCEG score recompute
  26. 2026-08-17 13:54 UTCVendor advisory
  27. 2026-08-17 13:54 UTCGHSA enrichment
  28. 2026-08-17 13:47 UTCEPSS rescore
  29. 2026-08-17 10:06 UTCEG score recompute
  30. 2026-08-17 10:06 UTCVendor advisory
  31. 2026-08-17 10:06 UTCGHSA enrichment
  32. 2026-08-16 14:56 UTCEPSS rescore
  33. 2026-08-16 14:56 UTCEPSS rescore
  34. 2026-08-16 11:27 UTCVendor advisory
  35. 2026-08-16 11:27 UTCGHSA enrichment
  36. 2026-08-16 07:39 UTCVendor advisory
  37. 2026-08-16 07:39 UTCGHSA enrichment
  38. 2026-08-16 03:39 UTCEG score recompute
  39. 2026-08-16 03:39 UTCVendor advisory
  40. 2026-08-16 03:39 UTCGHSA enrichment
  41. 2026-08-16 02:15 UTCEPSS rescore
  42. 2026-08-15 01:35 UTCEG score recompute
  43. 2026-08-15 01:35 UTCVendor advisory
  44. 2026-08-15 01:35 UTCGHSA enrichment
  45. 2026-08-15 01:31 UTCEPSS rescore
  46. 2026-08-14 21:48 UTCVendor advisory
  47. 2026-08-14 21:48 UTCGHSA enrichment
  48. 2026-08-14 18:00 UTCVendor advisory
  49. 2026-08-14 18:00 UTCGHSA enrichment
  50. 2026-08-14 13:35 UTCVendor advisory
  51. 2026-08-14 13:35 UTCGHSA enrichment
  52. 2026-08-14 09:47 UTCVendor advisory
  53. 2026-08-14 09:47 UTCGHSA enrichment
  54. 2026-08-14 05:59 UTCVendor advisory
  55. 2026-08-14 05:59 UTCGHSA enrichment
  56. 2026-08-14 02:11 UTCEG score recompute
  57. 2026-08-14 02:11 UTCVendor advisory
  58. 2026-08-14 02:11 UTCGHSA enrichment
  59. 2026-08-13 22:00 UTCEPSS rescore
  60. 2026-08-13 09:42 UTCVendor advisory
  61. 2026-08-13 09:42 UTCGHSA enrichment
  62. 2026-08-13 05:55 UTCVendor advisory
  63. 2026-08-13 05:55 UTCGHSA enrichment
  64. 2026-08-13 02:02 UTCVendor advisory
  65. 2026-08-13 02:02 UTCGHSA enrichment
  66. 2026-08-12 22:14 UTCVendor advisory
  67. 2026-08-12 22:14 UTCGHSA enrichment
  68. 2026-08-12 18:26 UTCVendor advisory
  69. 2026-08-12 18:26 UTCGHSA enrichment
  70. 2026-08-12 14:38 UTCEG score recompute
  71. 2026-08-12 14:38 UTCVendor advisory
  72. 2026-08-12 14:38 UTCGHSA enrichment
  73. 2026-08-12 13:51 UTCEPSS rescore
  74. 2026-08-11 22:36 UTCVendor advisory
  75. 2026-08-11 22:36 UTCGHSA enrichment

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-8836?
CVE-2026-8836 is a critical vulnerability published on May 18, 2026. A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmpparseinboundframe of the file src/apps/snmp/snmpmsg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be…
When was CVE-2026-8836 disclosed?
CVE-2026-8836 was first published in the National Vulnerability Database on May 18, 2026, with the most recent update on August 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8836 actively exploited?
CVE-2026-8836 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 25.9% of all scored CVEs.
What is the CVSS score of CVE-2026-8836?
CVE-2026-8836 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-8836?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8836, 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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