CVE-2026-89418

HIGHPre-NVD 8.78.7
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (20th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-81523 (ENISA EUVD)Source: ENISA EUVD

8.7EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.7Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

google-protobuf contains an unbounded recursion when parsing unknown protobuf group fields. An attacker can send a small crafted payload of deeply nested START_GROUP wire bytes to any Node.js service that calls the generated deserializeBinary() API, causing a RangeError: Maximum call stack size exceeded and crashing the process. No authentication or prior knowledge of the schema is required.

CVSS v3
8.7
EG Score
8.7HIGHmedium confidence
EG Risk
70
EG Risk 70/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity87% × 45%
Impact severity (EG Severity): CVSS 8.7 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
20th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.7): severity, escalated by confirmed exploitation. This CVE's 8.7 is its impact severity (EG Severity), not escalated.

EG Severity
8.7 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-27). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 17, 2026

Last Modified

September 18, 2026

Advisory Details (1)

Auto-updated Sep 17, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

Unbounded Recursive Group Skipping DoS in BinaryReader.skipGroup() · Advisory · protocolbuffers/protobuf-javascript · GitHub

https://github.com/protocolbuffers/protobuf-javascript/security/advisories/GHSA-5h29-r2cp-hfmr

Vendor Advisories for CVE-2026-89418(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 / EcosystemFix (by version range) / PatchReleasedSource
redhatrhoai/odh-mod-arch-model-registry-rhel9:17918534322026-10-21redhat

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 68× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 119 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 19 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:36 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  3. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  4. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  5. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  6. 2026-10-27 20:26 UTCEG score recompute
  7. 2026-10-27 20:26 UTCVendor advisory
  8. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  9. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  10. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  11. 2026-10-25 13:53 UTCEG score recompute
  12. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  13. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  14. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  15. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  16. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  17. 2026-10-20 08:16 UTCEG score recompute
  18. 2026-10-20 08:16 UTCVendor advisory
  19. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  20. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  21. 2026-10-18 03:02 UTCEG score recompute
  22. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  23. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  24. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  25. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.3% · 18th percentile
Show 75 more
  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  2. 2026-10-13 04:56 UTCEG score recompute
  3. 2026-10-13 04:56 UTCVendor advisory
  4. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  5. 2026-10-12 14:48 UTCEG score recompute
  6. 2026-10-12 02:26 UTCVendor advisory
  7. 2026-10-11 19:15 UTCEG score recompute
  8. 2026-10-11 16:32 UTCEG score recompute
  9. 2026-10-11 15:23 UTCEG score recompute
  10. 2026-10-11 15:23 UTCVendor advisory
  11. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  12. 2026-10-11 13:48 UTCEG score recompute
  13. 2026-10-11 04:21 UTCEG score recompute
  14. 2026-10-11 04:21 UTCVendor advisory
  15. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  16. 2026-10-10 06:15 UTCEG score recompute
  17. 2026-10-10 06:15 UTCVendor advisory
  18. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  19. 2026-10-09 19:13 UTCVendor advisory
  20. 2026-10-09 08:11 UTCVendor advisory
  21. 2026-10-08 21:08 UTCEG score recompute
  22. 2026-10-08 21:08 UTCVendor advisory
  23. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  24. 2026-10-08 10:05 UTCEG score recompute
  25. 2026-10-08 10:05 UTCVendor advisory
  26. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  27. 2026-10-07 23:03 UTCVendor advisory
  28. 2026-10-07 12:00 UTCVendor advisory
  29. 2026-10-07 00:55 UTCEG score recompute
  30. 2026-10-07 00:55 UTCVendor advisory
  31. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  32. 2026-10-06 13:30 UTCVendor advisory
  33. 2026-10-06 02:28 UTCEG score recompute
  34. 2026-10-06 02:28 UTCVendor advisory
  35. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  36. 2026-10-05 15:26 UTCVendor advisory
  37. 2026-10-05 04:16 UTCEG score recompute
  38. 2026-10-05 04:16 UTCVendor advisory
  39. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  40. 2026-10-04 17:14 UTCVendor advisory
  41. 2026-10-04 06:09 UTCVendor advisory
  42. 2026-10-03 19:08 UTCEG score recompute
  43. 2026-10-03 19:08 UTCVendor advisory
  44. 2026-10-03 08:06 UTCVendor advisory
  45. 2026-10-02 20:49 UTCEG score recompute
  46. 2026-10-02 20:49 UTCVendor advisory
  47. 2026-10-02 09:47 UTCVendor advisory
  48. 2026-10-01 22:45 UTCEG score recompute
  49. 2026-10-01 22:45 UTCVendor advisory
  50. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  51. 2026-10-01 11:44 UTCVendor advisory
  52. 2026-10-01 00:37 UTCEG score recompute
  53. 2026-10-01 00:37 UTCVendor advisory
  54. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  55. 2026-09-30 13:15 UTCVendor advisory
  56. 2026-09-30 02:12 UTCEG score recompute
  57. 2026-09-30 02:12 UTCVendor advisory
  58. 2026-09-29 15:11 UTCVendor advisory
  59. 2026-09-29 04:09 UTCEG score recompute
  60. 2026-09-29 04:09 UTCVendor advisory
  61. 2026-09-28 17:06 UTCEG score recompute
  62. 2026-09-28 17:06 UTCVendor advisory
  63. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  64. 2026-09-28 05:54 UTCVendor advisory
  65. 2026-09-27 18:53 UTCEG score recompute
  66. 2026-09-27 18:53 UTCVendor advisory
  67. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  68. 2026-09-27 07:51 UTCVendor advisory
  69. 2026-09-26 20:49 UTCEG score recompute
  70. 2026-09-26 20:49 UTCVendor advisory
  71. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  72. 2026-09-26 09:43 UTCEG score recompute
  73. 2026-09-26 09:43 UTCVendor advisory
  74. 2026-09-25 22:41 UTCVendor advisory
  75. 2026-09-25 11:39 UTCVendor advisory

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Frequently asked(5)

What is CVE-2026-89418?
CVE-2026-89418 is a high-severity vulnerability; its CVE record was published on September 17, 2026. google-protobuf contains an unbounded recursion when parsing unknown protobuf group fields. An attacker can send a small crafted payload of deeply nested START_GROUP wire bytes to any Node.js service that calls the generated deserializeBinary() API, causing a RangeError: Maximum call stack size…
When was the CVE record for CVE-2026-89418 published?
The CVE record for CVE-2026-89418 was published on September 17, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 18, 2026; the record at its source may have been updated since.
Is CVE-2026-89418 actively exploited?
CVE-2026-89418 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (20th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-89418?
CVE-2026-89418 has a CVSS base score of 8.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-89418?
A fix for CVE-2026-89418 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-89418 are linked in the Vendor Advisories panel on this page.

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