# electrumd malicious build-time telemetry exfiltration

Source: https://junglewise.ai/threats/rustsec-2026-0465-electrumd-was-removed-from-crates-io-for-malicious-d05ac728  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-09. Updated: 2026-11-11  
License: CC BY 4.0 with a link back

Severity: info · Published 2026-11-09

The electrumd Rust crate contained malicious code designed to steal telemetry and build environment data during compilation and send it to an attacker-controlled server. The crate was published on crates.io for approximately 10 months before being identified and removed; while no real-world usage was confirmed, any project that added this dependency during that period could have had sensitive build information compromised.

Vendors: [crates.io](https://junglewise.ai/threats/vendors/crates-io).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Informational severity, published 9 November 2026.

**Which products and versions are affected?** electrumd (crates.io) SEMVER:introduced=0.0.0-0; Electrumd 0.0.0-0 (all versions, 5 published 2026-01-26).

**Is there a fix for This vulnerability?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is This vulnerability attacked?** It is attacked over the network, in a software library.

**Am I affected?** Check whether you run electrumd (crates.io) or Electrumd at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The malicious code executed during the build phase, exfiltrating telemetry from the build environment to an arbitrary attacker-controlled URL. The attack required no user interaction beyond adding the crate as a dependency; all 5 versions published on 2026-01-26 contained this behavior. The crate has been removed from crates.io with no patched versions available.

## Affected products

- electrumd 0.0.0-0 (all versions, 5 published 2026-01-26)

## Timeline

- 2026-11-09: disclosed: Vulnerability reported and advisory issued
- 2026-01-26: other: Malicious versions published to crates.io
- 2026-11: other: Crate removed from crates.io after ~10 months; no evidence of actual usage found

## References

- [https://crates.io/crates/electrumd](https://crates.io/crates/electrumd)
- [https://rustsec.org/advisories/RUSTSEC-2026-0465.html](https://rustsec.org/advisories/RUSTSEC-2026-0465.html)