What is CVE-2026-8723?

CVE-2026-8723 is a medium-severity vulnerability in Ljharb Qs, classified under NULL Pointer Dereference. CVSS score: 5.3/10. Published 2026-05-17.

How severe is CVE-2026-8723?

Medium severity. CVSS v3 base score is 5.3 out of 10.

NULL pointer dereference in Ljharb Qs

CVE-2026-8723

### 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 option…

EPSS: 0.000 (13.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Ljharb Qs — versions 6.11.1

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

7ffcee3d-2c14-4c3e-b844-86c6a321a158 (vendor-advisory)
7ffcee3d-2c14-4c3e-b844-86c6a321a158 (patch)

Frequently asked questions

What is CVE-2026-8723?: CVE-2026-8723 is a medium-severity vulnerability in Ljharb Qs, classified under NULL Pointer Dereference. CVSS score: 5.3/10. Published 2026-05-17.
How severe is CVE-2026-8723?: Medium severity. CVSS v3 base score is 5.3 out of 10.