CVE-2026-15895
OS command injection in jsii-diff npm allows arbitrary command execution via crafted package specifiers
Is CVE-2026-15895 being exploited?
Not confirmed. CVE-2026-15895 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 1.1% probability of exploitation in the next 30 days.
How severe is CVE-2026-15895?
CVE-2026-15895 is rated High with a CVSS score of 8.4. 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-2026-15895?
Yes. A fix has been recorded for CVE-2026-15895. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-15895 affect?
CVE-2026-15895 affects jsii-diff < 1.131.0, AWS jsii toolchain, Build systems/CI that parse npm: sources. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-15895?
Upgrade jsii-diff to >=1.131.0 and audit CI/build inputs for untrusted package specifiers
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attackers can achieve remote OS command execution by supplying crafted npm: source package specifiers to jsii-diff, enabling arbitrary commands in build/dev contexts.
Patch when possible
- affected< 1.131.0
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.