CGA-XQVV-5W52-GQQQ: opensearch-dashboards-2 Chainguard
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The data service did not report a status for this record. Only the available sections are shown.Vulnerability summary
CGA-XQVV-5W52-GQQQ is a vulnerability in opensearch-dashboards-2 Chainguard with no CVSS score yet.
Priority
Insufficient evidence
No CVSS vector published; no exploitation reported by the 5 checked sources
Source freshness unavailable
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010
No CVSS score recordedEPSS scoreNot scoredRisk metrics not yet published.
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded
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Upstream 0 · Downstream 0 · Related 1Timeline
No timeline events recorded.
Description
No description has been published for this record.
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No EPSS score has been published for this record yet.
Known exploited
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CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
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Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Version check
Known conditions: not stated in public data.
Chainguard15 products
- opensearch-dashboards-2< 2.19.2-r2
- opensearch-dashboards-2-alerting-dashboards-plugin< 2.19.2-r2
- opensearch-dashboards-2-anomaly-detection-dashboards-plugin< 2.19.2-r2
- opensearch-dashboards-2-config< 2.19.2-r2
- opensearch-dashboards-2-dashboards-maps< 2.19.2-r2
- opensearch-dashboards-2-dashboards-notifications< 2.19.2-r2
- opensearch-dashboards-2-dashboards-observability< 2.19.2-r2
- opensearch-dashboards-2-dashboards-query-workbench< 2.19.2-r2
- opensearch-dashboards-2-dashboards-reporting< 2.19.2-r2
- opensearch-dashboards-2-dashboards-search-relevance< 2.19.2-r2
- opensearch-dashboards-2-dashboards-visualizations< 2.19.2-r2
- opensearch-dashboards-2-index-management-dashboards-plugin< 2.19.2-r2
- opensearch-dashboards-2-ml-commons-dashboards< 2.19.2-r2
- opensearch-dashboards-2-security-analytics-dashboards-plugin< 2.19.2-r2
- opensearch-dashboards-2-security-dashboards-plugin< 2.19.2-r2
1 vendor · 15 products
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When `qs.parse` is called with `comma: true` and `throwOnLimitExceeded: true`, a comma-separated value under a bracket-push key (`a[]=1,2,3,4`) is split into an array without being compared against `arrayLimit`, while the same value under a flat key (`a=1,2,3,4`), an indexed key (`a[0]=`), a nested key (`a[b]=`), or a dotted key (`a.b=` with `allowDots`) throws the documented `RangeError`. A single parameter such as `a[]=1,2,2,...` therefore produces an inner array of arbitrary length even though the caller opted into the hard limit. This is the `[]=` key form that the fix for CVE-2026-2391 (qs 6.14.2) did not cover.
### Details
In `lib/parse.js`, a comma-separated value under a `[]=` key is split and then wrapped as a single nested element (`val = [val]`, so that each `a[]=x,y` group counts as one element of the outer array). The `arrayLimit` check that 6.14.2 added for comma values runs after that wrap, so for `[]=` parts it only ever saw the wrapper of length 1. 6.15.3 added a pre-split comma count so that an oversized value throws before it is allocated, but gated it on an `isFlatArrayValue` flag that `parseValues` set to `false` for any part containing `[]=`, and did not pass it for object-valued input, so the gap remained.
#### PoC
```js
var qs = require('qs');
var options = { comma: true, arrayLimit: 3, throwOnLimitExceeded: true };
qs.parse('a=1,2,3,4', options); // RangeError: Array limit exceeded. Only 3 elements allowed in an array.
qs.parse('a[]=1,2,3,4', options); // { a: [ [ '1', '2', '3', '4' ] ] } (no throw)
qs.parse('a[]=' + '1,'.repeat(1000000) + '1', { comma: true, arrayLimit: 20, throwOnLimitExceeded: true });
// no throw; a 1,000,001-element inner array is allocated
```
#### Fix
`lib/parse.js`, applied in 8859c37 on `main` and released as v6.16.0: the `isFlatArrayValue` gate is removed, so every comma-split value is counted against `arrayLimit` before splitting regardless of key form. An in-limit group under `a[]=` still counts as one element of the outer array, and the default (`throwOnLimitExceeded: false`) path is unchanged.
### Affected versions
`>=6.14.2 <6.16.0`, fixed in v6.16.0.
v6.14.2 introduced `arrayLimit` enforcement for comma values (the fix for CVE-2026-2391) but only for values not under a `[]=` key, and every release from v6.14.2 through v6.15.3 has the same gap. v6.14.0 and v6.14.1, where `throwOnLimitExceeded` exists but does not apply to any comma form, are covered by CVE-2026-2391 rather than this record. Earlier lines (6.7.x through 6.13.x) have `comma` but no `throwOnLimitExceeded`, so there is no hard cap on any comma path to bypass; releases before 6.7.0 have no `comma` option.
### Impact
An unauthenticated attacker who can reach an application that parses untrusted query strings or urlencoded bodies with both `comma: true` and `throwOnLimitExceeded: true` (both non-default) can bypass the configured limit with a single `a[]=` parameter and force the parser to allocate an array proportional to the request size. The cost is strictly linear in the attacker-supplied bytes (about 0.1 microseconds and 6 to 7 retained bytes per input byte; the same out-of-memory threshold as the documented default `throwOnLimitExceeded: false` path), so a transport-layer request or body size limit bounds it completely (and node's default maximum HTTP header size of 16 KB already bounds the request line, so multi-megabyte payloads need a body parser). The impact is that an opt-in hard limit fails open on one key spelling, not unbounded allocation from a small input.CVSS6.3MediumEPSS0.54%