What is CVE-2026-77177?

CVE-2026-77177 is a critical-severity vulnerability in N/a, classified under Code Injection. CVSS score: 9.8/10. Published 2026-09-29.

How severe is CVE-2026-77177?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in N/a

CVE-2026-77177

Open GenAI Stack (aka ogx-ai) 2026-06-11, as used in the Meta AI backend for WhatsApp and other products, allows code execution because prompt injection (with Jinja2 template syntax) can be used to achieve server-side expression evaluation without sanitization.

Vulnerability class: RCE (Remote Code Execution)

Published 2026-09-29 · last modified 2026-09-29.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Weakness classification (CWE)

CWE-94 — Code Injection

References

gist.github.com/abhi04anon/8ce0b68a5a7dda8a0501cbaf933173eb

Frequently asked questions

What is CVE-2026-77177?: CVE-2026-77177 is a critical-severity vulnerability in N/a, classified under Code Injection. CVSS score: 9.8/10. Published 2026-09-29.
How severe is CVE-2026-77177?: Critical severity. CVSS v3 base score is 9.8 out of 10.