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  - ### Summary `qs.stringify` throws `TypeError` when called with `arrayFormat: 'comma'` and     `encodeValuesOnly: true` on an array containing `null` or `undefined`. The throw is synchronous and not     handled by any of qs's null-related options (`skipNulls`, `strictNullHandling`). ### Details In the comma     + `encodeValuesOnly` branch, `lib/stringify.js:145` mapped the array through the raw encoder before     joining: ```js obj = utils.maybeMap(obj, encoder); ``` `utils.encode` (`lib/utils.js:195`) reads     `str.length` with no null guard, so a `null` or `undefined` element throws `TypeError`. `skipNulls` and     `strictNullHandling` are both checked in the per-element loop below this line and never get a chance to     run. Same class of bug as the filter-array path fixed in 0c180a4. The vulnerable shape of the comma +     `encodeValuesOnly` branch was introduced in 4c4b23d (encode comma values more consistently, PR #463,     2023-01-19), first released in v6.11.1. #### PoC ```js const qs = require('qs'); qs.stringify({ a: [null,     'b'] }, { arrayFormat: 'comma', encodeValuesOnly: true }); qs.stringify({ a: [undefined, 'b'] }, {     arrayFormat: 'comma', encodeValuesOnly: true }); qs.stringify({ a: [null] }, { arrayFormat: 'comma',     encodeValuesOnly: true }); // TypeError: Cannot read properties of null (reading 'length') // at encode     (lib/utils.js:195:13) // at Object.maybeMap (lib/utils.js:322:37) // at stringify     (lib/stringify.js:145:25) ``` #### Fix `lib/stringify.js:145`, applied in 21f80b3 on `main` and released     as v6.15.2: ```diff - obj = utils.maybeMap(obj, encoder); + obj = utils.maybeMap(obj, function (v) { +     return v == null ? v : encoder(v); + }); ``` `null` and `undefined` now pass through `maybeMap` unchanged     and reach the `join(',')` step as-is. For `{ a: [null, 'b'] }` this produces `a=,b`, matching the     non-`encodeValuesOnly` comma path (which already joins before encoding and produces `a=%2Cb` for the same     input). Single-element `[null]` arrays still collapse via the existing `obj.join(',') || null` and remain     subject to `skipNulls` / `strictNullHandling` in the main loop. ### Affected versions `>=6.11.1 <6.15.2`     fixed in v6.15.2. The vulnerable code shape was introduced in 4c4b23d and first shipped in v6.11.1.
    Earlier versions  including all of 6.7.x, 6.8.x, 6.9.x, 6.10.x, and 6.11.0  implemented the comma +     `encodeValuesOnly` path differently (joining before encoding) and are not affected. Empirically verified     across released versions. ### Impact Application code that calls `qs.stringify` with both `arrayFormat:
    'comma'` and `encodeValuesOnly: true` (both non-default) on input that may contain a `null` or `undefined`     array element will throw synchronously instead of producing a query string. In a typical Node.js HTTP     framework (Express, Fastify, Koa, hapi) the sync throw is caught by the framework's error boundary and the     affected request returns a 500; the worker process does not exit and subsequent requests are unaffected.
    The kills the worker process framing applies only to call sites outside a request-handler error boundary     (background jobs, startup paths, stream pipelines) or to deployments with framework error handling     explicitly disabled. The vulnerable input is a `null` or `undefined` entry inside an array; this is     reachable from JSON request bodies or from application code constructing arrays from user input, but not     from standard HTML form submissions (which produce strings or omitted fields, not literal `null`).
    (CVE-2026-8723)

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Linux Distros Unpatched Vulnerability : CVE-2026-8723

medium Nessus Plugin ID 315208

Version 1.3

Version 1.1

Version 1.3 May 29, 2026, 11:45 PM Detection (updated detection logic) Plugin metadata Plugin Feed: 202605292345
Version 1.1 May 18, 2026, 10:15 PM New Plugin Feed: 202605182215