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: 1.0%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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
7.5HIGHmedium 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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
EPSS PROB
1.0%
EPSS %ILE
60th
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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
multer—
  • every version up to 2.1.1: fixed in 2.1.1
—

Weakness Classification(2)

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

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 123 total refreshes for this CVE.

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

Related CVEs(same product + 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 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 1.0% probability of exploitation in the next 30 days (60th percentile of EPSS-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?
A fix for CVE-2026-3520 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-3520 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-3520

Explore →

Is Your Infrastructure Affected by CVE-2026-3520?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs