CVE-2026-3520 (GCVE-0-2026-3520)

Vulnerability from cvelistv5 – Published: 2026-03-04 16:17 – Updated: 2026-07-15 01:03
VLAI
Title
Multer vulnerable to Denial of Service via uncontrolled recursion
Summary
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.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-04 17:12 UTC
CWE
  • CWE-674 - Uncontrolled Recursion
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
Vendor Product Version CPE status
expressjs multer Affected: 0 , < 2.1.1 (semver)
guessed Create a notification for this product.
Red Hat Red Hat Developer Hub 1.8 Unaffected: 1774545605 , < * (rpm)
    cpe:/a:redhat:rhdh:1.8::el9
Create a notification for this product.
Red Hat Red Hat Developer Hub 1.9 Unaffected: 1775140647 , < * (rpm)
    cpe:/a:redhat:rhdh:1.9::el9
Create a notification for this product.
Red Hat Self-service automation portal 2     cpe:/a:redhat:ansible_portal:2
Create a notification for this product.
Credits
Yuki Matsuhashi Chris de Almeida Ulises Gascón
Show details on NVD website
To clipboard 

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            {
              "descriptions": [
                {
                  "cweId": "CWE-674",
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        "dateReserved": "2026-03-04T15:27:42.237Z",
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}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.