CVE-2026-77177

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-29. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.8Exploit: Elevated riskExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

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.

CVSS v3
9.8
EG Score
9.8CRITICALhigh confidence
EG Risk
75
EG Risk 75/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.6%
EPSS %ILE
46th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 29, 2026

Last Modified

September 30, 2026

Advisory Details (1)

Auto-updated Sep 30, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

CVE-2026-77177 · GitHub

https://gist.github.com/abhi04anon/8ce0b68a5a7dda8a0501cbaf933173eb

Vendor Advisories for CVE-2026-77177(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 41× in last 7d / 41× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-04 12:35 UTCGHSA enrichment
  2. 2026-10-04 08:16 UTCGHSA enrichment
  3. 2026-10-04 03:57 UTCGHSA enrichment
  4. 2026-10-03 23:34 UTCGHSA enrichment
  5. 2026-10-03 19:15 UTCGHSA enrichment
  6. 2026-10-03 14:56 UTCEG score recompute
  7. 2026-10-03 14:56 UTCGHSA enrichment
  8. 2026-10-03 14:26 UTCEPSS rescore
  9. 2026-10-03 10:37 UTCGHSA enrichment
  10. 2026-10-03 06:17 UTCGHSA enrichment
  11. 2026-10-03 01:58 UTCGHSA enrichment
  12. 2026-10-02 21:39 UTCEG score recompute
  13. 2026-10-02 21:39 UTCGHSA enrichment
  14. 2026-10-02 17:19 UTCGHSA enrichment
  15. 2026-10-02 12:59 UTCGHSA enrichment
  16. 2026-10-02 08:40 UTCGHSA enrichment
  17. 2026-10-02 04:22 UTCGHSA enrichment
  18. 2026-10-02 00:02 UTCEG score recompute
  19. 2026-10-02 00:02 UTCGHSA enrichment
  20. 2026-10-01 19:50 UTCEPSS rescore
  21. 2026-10-01 19:43 UTCGHSA enrichment
  22. 2026-10-01 15:25 UTCGHSA enrichment
  23. 2026-10-01 11:05 UTCGHSA enrichment
  24. 2026-10-01 06:44 UTCGHSA enrichment
  25. 2026-10-01 02:24 UTCGHSA enrichment
Show 16 more
  1. 2026-09-30 22:05 UTCGHSA enrichment
  2. 2026-09-30 17:46 UTCEG score recompute
  3. 2026-09-30 17:46 UTCGHSA enrichment
  4. 2026-09-30 13:48 UTCGHSA enrichment
  5. 2026-09-30 09:28 UTCGHSA enrichment
  6. 2026-09-30 05:07 UTCGHSA enrichment
  7. 2026-09-30 00:47 UTCEG score recompute
  8. 2026-09-30 00:47 UTCGHSA enrichment
  9. 2026-09-29 20:28 UTCEG score recompute
  10. 2026-09-29 20:28 UTCGHSA enrichment
  11. 2026-09-29 20:01 UTCEG score recompute▲ 9.80
  12. 2026-09-29 20:00 UTCGHSA enrichment
  13. 2026-09-29 19:58 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  14. 2026-09-29 16:24 UTCNVD update
  15. 2026-09-29 15:58 UTCEG score recompute
  16. 2026-09-29 15:58 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77177?
CVE-2026-77177 is a critical vulnerability published on September 29, 2026. 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.
When was CVE-2026-77177 disclosed?
CVE-2026-77177 was first published on September 29, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77177 actively exploited?
CVE-2026-77177 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (46th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77177?
CVE-2026-77177 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-77177?
No fix for CVE-2026-77177 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-77177 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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