CVE-2026-3520

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 50% 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, nvd
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

Multer is a node.js middleware for handling multipart/form-data. A vulnerability in Multer prior to version 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow. Users should upgrade to version 2.1.1 to receive a patch. No known workarounds are available.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
51%
KEV
Not listed

Published

March 4, 2026

Last Modified

July 15, 2026

Advisory Details (9)

Auto-updated Jul 3, 2026
Patch available. Sources: github_commit, github, redhat.
redhat Patch Available
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3520.json
redhat

2444584 – (CVE-2026-3520) CVE-2026-3520 multer: Multer: Denial of Service via malformed requests

https://bugzilla.redhat.com/show_bug.cgi?id=2444584
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-3520
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:6802
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:6174
generic
https://www.cve.org/CVERecord?id=CVE-2026-3520
github Patch Available

Multer vulnerable to Denial of Service via uncontrolled recursion · Advisory · expressjs/multer · GitHub

https://github.com/expressjs/multer/security/advisories/GHSA-5528-5vmv-3xc2
github_commit Patch Available

commit 7e66481f8b2e (expressjs/multer)

Patch available: expressjs/multer v2.1.1 (contains commit 7e66481f8b2e)

https://github.com/expressjs/multer/commit/7e66481f8b2e6c54b982b34c152479e096ce2752
generic

Security Advisories | OpenJS Foundation CVE Numbering Authority

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

Vendor Advisories for CVE-2026-3520(2)

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 / EcosystemFixed in / PatchReleasedSource
redhatrhdh/rhdh-hub-rhel9:17751406472026-04-07redhat
redhatrhdh/rhdh-hub-rhel9:17745456052026-03-30redhat

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 rangeFixed inDependents
multer—2.1.1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 55× 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.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-3520?
CVE-2026-3520 is a high vulnerability published on March 4, 2026. Multer is a node.js middleware for handling multipart/form-data. A vulnerability in Multer prior to version 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow. Users should upgrade to version 2.1.1 to receive a patch. No…
When was CVE-2026-3520 disclosed?
CVE-2026-3520 was first published in the National Vulnerability Database on March 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-2026-3520 actively exploited?
CVE-2026-3520 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 49.1% of all scored CVEs.
What is the CVSS score of CVE-2026-3520?
CVE-2026-3520 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-3520?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-3520, 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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