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VulnerabilityPublished

CVE-2026-71851: brix crypto-js · Insufficient Entropy

Affects brix crypto-jsSource CVE Database V5

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Not known to be exploited · CVSS 9.0 Critical : upgrade to 4.0.0 as a priority.

Data as of 5 Nov 2026, 23:24 UTC

CVSS 3.1 base score
9.0Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.5% chance of exploitation in 30 days – higher than 46% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.0.0
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 7 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: evidence found.

    Public exploit code: GitHub proofs of concept

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade brix crypto-js to 4.0.0.

Affected software

ProductAffectedFixed in
brixcrypto-jsAffected
  • <4.0.0
Fixed in
  • 4.0.0
npmcrypto-jspkg:npm/crypto-jsOther threatsAffected
  • <4.0.0 >=3.1.2-4
Fixed in
  • 4.0.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade to crypto-js version 4.0.0 or later, where the insecure pseudorandom number generator has been replaced with a cryptographically secure source. Avoid using CryptoJS.lib.WordArray.random() from versions prior to 4.0.0 for cryptographic entropy, especially in wallet or key generation contexts. Patch status is not explicitly stated in the vendor advisory, but the fix is included in version 4.0.0.

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.

References

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