CVE-2026-82562: qs array-limit bypass via bracket-key comma parsing

September 2, 2026

qs v6.15.3 allows bracket-key input to bypass arrayLimit and throwOnLimitExceeded when comma: true. The input a[]=1,2,3,4 succeeds with arrayLimit: 3, while the equivalent plain-key input is rejected.

Affected version tested:

qs v6.15.3
commit 18d085e919dae70c8f1b200ab99323058edab2c2

References

github.com/advisories/GHSA-x5fp-wj9c-mxmx
github.com/ljharb/qs/commit/8859c37470e11b42b547b275e4e9bd0bc8cc5464
github.com/ljharb/qs/security/advisories/GHSA-w7fw-mjwx-w883
github.com/ljharb/qs/security/advisories/GHSA-x5fp-wj9c-mxmx
nvd.nist.gov/vuln/detail/CVE-2026-82562

Code Behaviors & Features

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