CVE-2026-77078

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (40th 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 — Patch released this week
7.5EG
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).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

multer is a middleware for handling multipart/form-data in Node.js. A small multipart request containing two specially crafted text field names can cause an uncaught RangeError (Invalid array length) that terminates the Node.js process. The first field uses a very large numeric array index to allocate a maximum-length sparse array, and a second field then pushes past that length, which throws inside the append-field dependency and is not caught by multer. All versions before 2.3.0 are affected, and the issue is a remotely triggerable denial of service. The issue is fixed in multer 2.3.0. Upgrade to multer 2.3.0 to remediate.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
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 none (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
0.5%
EPSS %ILE
40th
KEV
Not listed

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 none (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.

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

August 28, 2026

Last Modified

September 2, 2026

Advisory Details (2)

Auto-updated Aug 28, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

multer vulnerable to Denial of Service via crafted multipart field names · Advisory · expressjs/multer · GitHub

https://github.com/expressjs/multer/security/advisories/GHSA-wc9g-mqfw-jrwm
Web page

Security Advisories | OpenJS Foundation CVE Numbering Authority

https://cna.openjsf.org/security-advisories.html

Vendor Advisories for CVE-2026-77078(3)

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhdh/rhdh-hub-rhel9:17913114952026-10-08redhat
redhatrhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend:17912512822026-10-06redhat

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

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
multer—
  • every version up to 2.3.0: fixed in 2.3.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 62× 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.

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. 2 repeat rows among the latest 96 are merged into the row they repeat.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-10-13 07:02 UTCEG score recompute
  3. 2026-10-13 07:02 UTCVendor advisory
  4. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-10-12 15:37 UTCEG score recompute
  6. 2026-10-11 19:23 UTCEG score recompute
  7. 2026-10-11 16:39 UTCEG score recompute
  8. 2026-10-11 13:58 UTCEG score recompute
  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  11. 2026-10-10 11:50 UTCVendor advisory
  12. 2026-10-10 00:48 UTCEG score recompute
  13. 2026-10-10 00:48 UTCVendor advisory
  14. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-10-09 02:37 UTCEG score recompute
  16. 2026-10-09 02:37 UTCVendor advisory
  17. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  18. 2026-10-08 00:50 UTCEG score recompute
  19. 2026-10-08 00:50 UTCVendor advisory
  20. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  21. 2026-10-07 09:50 UTCVendor advisory
  22. 2026-10-06 22:47 UTCEG score recompute
  23. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  24. 2026-10-06 00:47 UTCEG score recompute
  25. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 39th percentile
Show 69 more
  1. 2026-10-05 01:36 UTCEG score recompute
  2. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  3. 2026-10-03 16:02 UTCEG score recompute
  4. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  5. 2026-10-03 04:50 UTCEG score recompute
  6. 2026-10-02 06:48 UTCEG score recompute
  7. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  8. 2026-09-30 19:48 UTCEG score recompute
  9. 2026-09-30 03:49 UTCEG score recompute
  10. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  11. 2026-09-29 02:50 UTCEG score recompute
  12. 2026-09-28 15:50 UTCEG score recompute
  13. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  14. 2026-09-27 17:42 UTCEG score recompute
  15. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  16. 2026-09-26 19:19 UTCEG score recompute
  17. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  18. 2026-09-26 08:03 UTCEG score recompute
  19. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  20. 2026-09-24 18:42 UTCEG score recompute
  21. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  22. 2026-09-22 21:54 UTCEG score recompute
  23. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  24. 2026-09-21 23:54 UTCEG score recompute
  25. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  26. 2026-09-21 01:54 UTCEG score recompute
  27. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  28. 2026-09-19 16:51 UTCEG score recompute
  29. 2026-09-19 05:50 UTCEG score recompute
  30. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  31. 2026-09-17 20:50 UTCEG score recompute
  32. 2026-09-16 21:51 UTCEG score recompute
  33. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  34. 2026-09-16 10:50 UTCEG score recompute
  35. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  36. 2026-09-15 12:48 UTCEG score recompute
  37. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  38. 2026-09-13 16:48 UTCEG score recompute
  39. 2026-09-12 18:48 UTCEG score recompute
  40. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  41. 2026-09-11 20:48 UTCEG score recompute
  42. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  43. 2026-09-11 09:46 UTCEG score recompute
  44. 2026-09-10 11:45 UTCEG score recompute
  45. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  46. 2026-09-09 00:26 UTCEG score recompute
  47. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  48. 2026-09-07 16:15 UTCEG score recompute
  49. 2026-09-06 18:12 UTCEG score recompute
  50. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  51. 2026-09-05 20:11 UTCEG score recompute
  52. 2026-09-04 22:11 UTCEG score recompute
  53. 2026-09-04 11:06 UTCEG score recompute
  54. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  55. 2026-09-02 15:01 UTCEG score recompute
  56. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  57. 2026-09-01 17:32 UTCEG score recompute
  58. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  59. 2026-09-01 06:31 UTCEG score recompute
  60. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  61. 2026-08-31 19:31 UTCEG score recompute
  62. 2026-08-31 18:56 UTCEG score recompute
  63. 2026-08-31 05:45 UTCEG score recompute
  64. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  65. 2026-08-30 07:45 UTCEG score recompute
  66. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  67. 2026-08-28 22:44 UTCEG score recompute
  68. 2026-08-28 22:02 UTCEG score recomputeFirst assessed: 7.5 HIGH
  69. 2026-08-28 21:59 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-77078?
CVE-2026-77078 is a high-severity vulnerability; its CVE record was published on August 28, 2026. multer is a middleware for handling multipart/form-data in Node.js. A small multipart request containing two specially crafted text field names can cause an uncaught RangeError (Invalid array length) that terminates the Node.js process. The first field uses a very large numeric array index to…
When was the CVE record for CVE-2026-77078 published?
The CVE record for CVE-2026-77078 was published on August 28, 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 2, 2026; the record at its source may have been updated since.
Is CVE-2026-77078 actively exploited?
CVE-2026-77078 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77078?
CVE-2026-77078 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-77078?
A fix for CVE-2026-77078 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-77078 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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