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Fencer Vulns
low 3.1

CVE-2025-46653 json

Formidable relies on hexoid to prevent guessing of filenames for untrusted executable content

published 2025-04-26 18 mo ago modified 2026-09-10 1 mo ago also GHSA-75v8-2h7p-7m2m , EUVD-2025-12478

cvss
3.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

Formidable (aka node-formidable) 2.1.0 through 3.x before 3.5.3 relies on hexoid to prevent guessing of filenames for untrusted executable content; however, hexoid is documented as not "cryptographically secure." (Also, there is a scenario in which only the last two characters of a hexoid string need to be guessed, but this is not often relevant.) NOTE: this does not imply that, in a typical use case, attackers will be able to exploit any hexoid behavior to upload and execute their own content.

Patch / fix

  • npm formidable 2.1.3, 3.5.3
  • node-formidable Formidable 3.5.3
  • node-formidable Debian 14 3.5.4+~cs11.10.5-1

debian advisories DEBIAN-CVE-2025-46653

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-46653 updated cvss 6.8

formidable: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in Formidable

  • Red Hat OpenShift Serverless openshift-serverless-1/kn-plugin-func-func-util-rhel8, openshift-serverless-1/kn-backstage-plugins-eventmesh-rhel8 Red Hat Developer Hub 1 rhdh/rhdh-hub-rhel9 Red Hat Enterprise Linux 6 firefox, thunderbird Red Hat Enterprise Linux 7 firefox, thunderbird Red Hat Enterprise Linux 8 firefox, mozjs60, thunderbird Red Hat Enterprise Linux 9 gjs, polkit, firefox, firefox-x11, polkit-libs, thunderbird
    +3 more products
    Red Hat Enterprise Linux 10 gjs, firefox, thunderbird Red Hat OpenShift AI (RHOAI) rhoai/odh-data-science-pipelines-argo-argoexec-rhel8, rhoai/odh-data-science-pipelines-argo-workflowcontroller-rhel8 Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9, openshift-gitops-1/gitops-operator-bundle
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/zast-ai/vulnerability-reports/blob/main/formidable/file_upload/report.md referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
NVD 3.1 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
GitHub 3.1 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
npm formidable
>=3.1.1-canary.20211030, <3.5.3
>=2.1.0, <2.1.3
3.5.3
2.1.3

Affected products

  • node-formidable Formidable

Classification

Weakness
  • CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.