CVE-2026-73413
Quadratic CPU DoS in Shescape JS via flag-protection loop
Is CVE-2026-73413 being exploited?
Not confirmed. CVE-2026-73413 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 0.34% probability of exploitation in the next 30 days.
How severe is CVE-2026-73413?
CVE-2026-73413 is rated High with a CVSS score of 8.7. 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-2026-73413?
Yes. A fix has been recorded for CVE-2026-73413. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-73413 affect?
CVE-2026-73413 affects shescape v2.1.11 - v2.1.13, shescape v3.0.0, Node.js/JS apps that include shescape. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-73413?
Update to shescape v2.1.14 or v3.0.1 and validate inputs
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker-supplied large inputs with many flag fragments cause quadratic CPU usage, leading to CPU exhaustion and denial of service in apps using Shescape.
Patch when possible
- affected>= 2.1.11 and < 2.1.14
- affected>= 3.0.0 and < 3.0.1
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.