CVE-2026-25150
Prototype pollution in Qwik City middleware enables object prototype pollution via crafted HTTP POST.
Is CVE-2026-25150 being exploited?
Not confirmed. CVE-2026-25150 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.65% probability of exploitation in the next 30 days.
How severe is CVE-2026-25150?
CVE-2026-25150 is rated Critical. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-25150?
Yes. A fix has been recorded for CVE-2026-25150. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-25150 affect?
CVE-2026-25150 affects Qwik City middleware <1.19.0, Node.js apps using @builder.io/qwik-city, Qwik framework deployments. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-25150?
Upgrade to v1.19.0+
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated POST can pollute Object.prototype, enabling privilege escalation, authentication bypass, or DoS.
Patch when possible
- affected< 1.19.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.