CVE-2026-56340
vLLM DoS via crafted embeddings; missing sparse tensor validation.
Is CVE-2026-56340 being exploited?
Not confirmed. CVE-2026-56340 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 0.64% probability of exploitation in the next 30 days.
How severe is CVE-2026-56340?
CVE-2026-56340 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-2026-56340?
Yes. A fix has been recorded for CVE-2026-56340. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-56340 affect?
CVE-2026-56340 affects vLLM library (embeddings/prompt-embeds). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-56340?
Upgrade to latest vLLM; disable prompt-embeds if not needed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote DoS via malformed embedding requests; crash/resource exhaustion and possible memory corruption.
Patch when possible
- affected>= 0.10.2 and < 0.13.0
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.