CVE-2026-5079High· 7.5▾ TwilightA flaw was found in Multer. A remote attacker can exploit this vulnerability by sending a single HTTP request with crafted multipart form data containing deeply nested field names. This can force the allocation of deeply nested object stru…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 30.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.3%
0.3% → 0.5%
Last analysed / modified upstream
A flaw was found in Multer. A remote attacker can exploit this vulnerability by sending a single HTTP request with crafted multipart form data containing deeply nested field names. This can force the allocation of deeply nested object structures, consuming excessive CPU and memory resources. The vulnerability ultimately leads to a Denial of Service (DoS) for the affected system.
multer: Multer: Denial of Service via deeply nested field names in multipart form data — rated Important by Red Hat. Released 2026-06-15, updated 2026-10-02.
Affected:
Fixed:
No fix planned:
Not affected:
For more about Ansible plugins for Red Hat Developer Hub, see References links https://access.redhat.com/errata/RHSA-2026:65118 For more about Ansible Portal Installer Bootc, see References links https://access.redhat.com/errata/RHSA-2026:66003 For more about Red Hat Developer Hub, see References links https://access.redhat.com/errata/RHSA-2026:48126
Workarounds / mitigations:
limits.fields option within your multer instance to a reasonable maximum value. This action restricts the number of fields processed from multipart form data, thereby limiting the resources an attacker can consume. This partial mitigation requires an application restart to take effect and does not fully prevent the vulnerability.Affected packages:
multer >= 1.0.0, < 2.2.0multer >= 3.0.0-alpha.1, < 3.0.0-alpha.2Patched in:
multer 2.2.0multer 3.0.0-alpha.2Connected by shared product, vendor, weakness, or advisory.
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