CVE-2026-75858
Remote code execution in CodeWhale agent via untrusted prompt injection.
Is CVE-2026-75858 being exploited?
Not confirmed. CVE-2026-75858 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 0.27% probability of exploitation in the next 30 days.
How severe is CVE-2026-75858?
CVE-2026-75858 is rated High. 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-2026-75858?
Yes. A fix has been recorded for CVE-2026-75858. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-75858 affect?
CVE-2026-75858 affects codewhale (codewhale, codewhale-tui) >=0.8.41 and <0.8.64, rlm_eval tool, rlm_open tool. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-75858?
Upgrade to CodeWhale >=0.8.64; restrict agent access to untrusted content and run in least-privilege sandboxes
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker can induce arbitrary Python code execution on the user's machine at the user's privilege via prompt injection in rlm_eval/rlm_open.
Immediate action required
- affected>= 0.8.33 and < 0.8.41
- affected>= 0.8.41 and < 0.8.64
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.