# CVE-2023-31290 — Trustwallet Trust Wallet Browser Extension

> As of 2026-07-10, CVE-2023-31290 is a MEDIUM-severity vulnerability in Trustwallet Trust Wallet Browser Extension, CVSS v3.1 5.9, EPSS 1.0% (63.2th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2023-31290, most recently “'Ill Bloom' Weak-Randomness Vulnerability in Legacy Crypto Wallets Actively Exploited to Drain $3.1M+”.

**Last updated:** 2026-07-10

## What is CVE-2023-31290?

Trust Wallet Core before 3.1.1, as used in the Trust Wallet browser extension before 0.0.183, allows theft of funds because the entropy is 32 bits, as exploited in the wild in December 2022 and March 2023. This occurs because the mt19937 Mersenne Twister takes a single 32-bit value as an input seed, resulting in only four billion possible mnemonics. The affected versions of the browser extension are 0.0.172 through 0.0.182. To steal funds efficiently, an attacker can identify all Ethereum addresses created since the 0.0.172 release, and check whether they are Ethereum addresses that could have been created by this extension. To respond to the risk, affected users need to upgrade the product version and also move funds to a new wallet address.

The record classifies CVE-2023-31290 under weakness class [CWE-338](https://cwe.mitre.org/data/definitions/338.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on integrity. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 1296 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 5.9 — MEDIUM (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **EPSS (FIRST):** 1.0% probability of exploitation in the next 30 days, higher than 63.2% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 7.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2023-04-27

## Is CVE-2023-31290 being exploited?

Weaponised exploit code for CVE-2023-31290 is publicly available. 2 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 29 in the Threadlinqs vulnerability feed.

- [ohexa/py_trustwallet_wasm](https://github.com/ohexa/py_trustwallet_wasm) (github)
- [trickest/cve](https://github.com/trickest/cve/blob/main/2023/CVE-2023-31290.md) (trickest)

## Affected products and versions

- **Trustwallet**: Trust Wallet Browser Extension, Trust Wallet Core

## How to fix CVE-2023-31290

The record marks a vendor fix as available for CVE-2023-31290. Patch reference: [https://github.com/trustwallet/wallet-core/compare/3.1.0...3.1.1](https://github.com/trustwallet/wallet-core/compare/3.1.0...3.1.1). Vendor advisory: [https://community.trustwallet.com/t/browser-extension-wasm-vulnerability-postmortem/750787](https://community.trustwallet.com/t/browser-extension-wasm-vulnerability-postmortem/750787). Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

## Threat activity tracking CVE-2023-31290

1 tracked threat in the Threadlinqs corpus references CVE-2023-31290, either in the campaign’s CVE list or as an indicator on the campaign record.

- ['Ill Bloom' Weak-Randomness Vulnerability in Legacy Crypto Wallets Actively Exploited to Drain $3.1M+](https://intel.threadlinqs.com/threat/TL-2026-1170) — CRITICAL · 2026-07-10

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [community.trustwallet.com](https://community.trustwallet.com/t/browser-extension-wasm-vulnerability-postmortem/750787)
- [community.trustwallet.com (750786)](https://community.trustwallet.com/t/wasm-vulnerability-incident-update-and-recommended-actions/750786)
- [github.com](https://github.com/trustwallet/wallet-core/compare/3.1.0...3.1.1)
- [twitter.com](https://twitter.com/TrustWallet/status/1649699428733947906)
- [blog.ledger.com](https://blog.ledger.com/Funds-of-every-wallet-created-with-the-Trust-Wallet-browser-extension-could-have-been-stolen/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2023-31290
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