Affects PyMongo (MongoDB's widely used Python driver); can redirect app DB traffic to attacker-controlled servers, risking credential exposure and data integrity across many apps.
CVE-2026-96748
PyMongo host parsing allows attacker to inject malicious hosts into client connections
Is CVE-2026-96748 being exploited?
Not confirmed. CVE-2026-96748 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.
How severe is CVE-2026-96748?
CVE-2026-96748 is rated High with a CVSS score of 8.3. 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-2026-96748?
Yes. A fix has been recorded for CVE-2026-96748. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-96748 affect?
CVE-2026-96748 affects PyMongo (mongo-python-driver) < 4.18.2, Python apps using PyMongo with connection strings from untrusted input. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-96748?
Upgrade PyMongo to 4.18.2+; validate or avoid untrusted host input
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Inject hosts into connection strings so clients connect to attacker servers, exposing authentication exchanges and enabling data observation or tampering.
Immediate action required
- affected< 4.18.2
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.