# CVE-2020-35900: RUSTSEC-2020-0047 - array_queue pop_back() may cause a use-after-free

Source: https://junglewise.ai/threats/cve-2020-35900-use-after-free-vulnerability-in-rust-array-queue  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2020-09-26  
License: CC BY 4.0 with a link back

CVE-2020-35900 · Severity: low · CVSS 3.1 · Published 2020-09-26

array_queue pop_back() may cause a use-after-free

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

## Quick answers

**Is CVE-2020-35900 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2020-35900 being exploited in the wild.

**How severe is CVE-2020-35900?** Low severity, with a CVSS score of 3.1, published 26 September 2020.

**Which products and versions are affected?** array-queue (crates.io) SEMVER:introduced=0.3.0, SEMVER:introduced=0.3.0,last_affected=0.3.3.

**Is there a fix for CVE-2020-35900?** 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.

**Am I affected by CVE-2020-35900?** Check whether you run array-queue (crates.io) 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.

## Affected products

- array-queue (crates.io) SEMVER:introduced=0.3.0, SEMVER:introduced=0.3.0,last_affected=0.3.3

## Identifiers

- CVE-2020-35900
- GHSA-75cq-g75g-rxff
- RUSTSEC-2020-0047

## Related threats

- [ArrayQueue's push_front is not panic-safe](https://junglewise.ai/threats/arrayqueue-s-push-front-is-not-panic-safe-c295f589)
- [RUSTSEC-2025-0054 - ArrayQueue::push_front is not panic-safe](https://junglewise.ai/threats/rustsec-2025-0054-arrayqueue-push-front-is-not-panic-safe-c33f34cd)