Secuno
ENNL
Book demo

CVE-2026-71851

9.0 CRITICALEPSS 0.55%
  1. Published7 Aug 2026

Description

crypto-js is a JavaScript library of crypto standards. Versions of crypto-js prior to 4.0.0 generate randomness in CryptoJS.lib.WordArray.random() using a custom variation of the Multiply-With-Carry pseudorandom number generator, seeded from Math.random(), instead of a cryptographically secure source. This generator was introduced in version 3.1.2-4 and remained present in nearly every 3.x release. Nominal requests for 128 or 256 bits of entropy through this function produce effective search spaces of approximately 2 to the 39th and 2 to the 47th possibilities, small enough to enumerate on commodity hardware. Downstream wallet applications that used CryptoJS.lib.WordArray.random() as the entropy source for BIP39 recovery phrases are affected, and an attacker who enumerates the reduced output space can recover the resulting private keys and control the associated funds. This issue is fixed in version 4.0.0.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-539539.1
GetSimple CMS is a content management system (CMS), and GetSimple CMS CE is the…
CVE-2026-799019.9
In deployments using BoKS keytab management, affected versions of boks_keytabmd…
CVE-2026-944569.1
Postiz generates security-sensitive credentials using `Math.random()` instead of a…
CVE-2026-941078.1
NivoCart through 2.4.0 contains a predictable password reset token vulnerability in the…
CVE-2026-938688.1
Cotonti through 1.0.0 derives password recovery validation tokens from md5(microtime())…
CVE-2026-136399.8
An insufficient entropy vulnerability in login logic in Synology DiskStation Manager…

Frequently asked

Is CVE-2026-71851 being actively exploited?

CVE-2026-71851 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.55%.

How severe is CVE-2026-71851?

CVE-2026-71851 has a CVSS 3.1 base score of 9.0, rated critical. EPSS estimates a 0.55% probability of exploitation.

How do I fix CVE-2026-71851?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-71851 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.