CVE-2026-55546
RCE via SymPy parse_expr in qwed-mcp verify_math_expression (pre-0.2.1).
Is CVE-2026-55546 being exploited?
Not confirmed. CVE-2026-55546 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 0.41% probability of exploitation in the next 30 days.
How severe is CVE-2026-55546?
CVE-2026-55546 is rated Critical with a CVSS score of 9.8. 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-2026-55546?
Yes. A fix has been recorded for CVE-2026-55546. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-55546 affect?
CVE-2026-55546 affects qwed-mcp (< 0.2.1), Applications/integrations invoking qwed-mcp verify_math_expression with untrusted input. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-55546?
Upgrade to qwed-mcp 0.2.1; validate/sanitize expressions and avoid exposing the API to untrusted input.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution as qwed-mcp process user via attacker-controlled math expressions; can run OS commands, read/modify files, exfiltrate secrets, or reach internal services.
Patch when possible
- affected< 0.2.1
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.