# CVE-2026-13311: node-shell-quote: shell-quote prior to 1.8.5 finalizes parsed tokens in parse() using Array.prototype.concat as a reduce accumulator, w...

CVE-2026-13311 is fixed in 3 products on 1 platform, first by OPENSUSE-SU-2026:21176-1, released June 30, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-13311
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0036
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 25, 2026

## Description

shell-quote prior to 1.8.5 finalizes parsed tokens in parse() using Array.prototype.concat as a reduce accumulator, which reallocates and copies the entire growing array on every iteration. As a result parse() runs in O(n^2) time relative to the number of input tokens. An attacker who can supply an attacker-controlled string to any code path that calls parse() (no shell metacharacters are required; plain space-separated words suffice) can block the single-threaded Node.js event loop for an extended period with a small input, resulting in a denial of service. There is no code execution or data disclosure; impact is to availability only. Fixed in 1.8.5.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | agama-web-ui opensuse-leap 16.0 | 17+673.b97ba64d6-160000.12.1 | [OPENSUSE-SU-2026:21448-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21448-1.md) | Jul 27, 2026 |
| Linux | node-shell-quote Debian 13.5 (trixie) | 1.7.4+~1.7.1-1+deb13u2 | [DEBIAN-CVE-2026-13311](https://patchblox.com/security/data/fix/linux/debian-cve-2026-13311.md) | Jul 1, 2026 |
| Linux | node-shell-quote Debian 14 | 1.9.0+~1.7.5-1 | [DEBIAN-CVE-2026-13311](https://patchblox.com/security/data/fix/linux/debian-cve-2026-13311.md) | Jul 1, 2026 |
| Linux | python-pytest-html opensuse-leap 16.0 | 4.1.1-bp160.3.1 | [OPENSUSE-SU-2026:21176-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21176-1.md) | Jun 30, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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