CVE-2023-39910

HIGH 7.5CVE-2023-39910 · Published 09/08/2023 · updated 17/06/2026

In short

CVE-2023-39910 is a HIGH (CVSS 7.5) vulnerability affecting libbitcoin explorer (libbitcoin).
Chance of exploitation in the next 30 days (EPSS): 1.8%, higher than 78.7% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
libbitcoin explorer libbitcoin	`≥ 3.0.0, ≤ 3.6.0`	No fix yet

Description

The cryptocurrency wallet entropy seeding mechanism used in Libbitcoin Explorer 3.0.0 through 3.6.0 is weak, aka the Milk Sad issue. The use of an mt19937 Mersenne Twister PRNG restricts the internal entropy to 32 bits regardless of settings. This allows remote attackers to recover any wallet private keys generated from "bx seed" entropy output and steal funds. (Affected users need to move funds to a secure new cryptocurrency wallet.) NOTE: the vendor's position is that there was sufficient documentation advising against "bx seed" but others disagree. NOTE: this was exploited in the wild in June and July 2023.

References

libbitcoin/libbitcoin-explorer · Third Party Advisory
libbitcoin/libbitcoin-explorer · Third Party Advisory
libbitcoin/libbitcoin-explorer
libbitcoin/libbitcoin-system · Third Party Advisory
milksad.info/disclosure.html · Third Party Advisory
news.ycombinator.com/item · Third Party Advisory

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