CVE-2026-76663

validatedZero produced an exploit or a check.

GHSA-9rwj-hh6p-x6gp ↗EUVD-2026-101815 ↗

check availableZero validated a working check for it.not proven exploitableZero has a detection check, but hasn't produced a full working exploit yet.
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).kevAttacks confirmed in the real world.
Hewlett Packard Enterprise HPE NonStop TELSERV T9553L01^BAJ and earlier
CWE-121 Stack-based Buffer Overflow
ETK-2026-1876Zero's internal tracking ID, independent of the CVE number., permanent identifier
+2.4dTTV
8mAI analysisAnalysis: how long the AI spent reversing this signal.
Check if you are vulnerable
timeline
0 = cve.org publication
trigger signal (cve.org) +0dcheck available+2.4dagent stopped
0
+1d
+2d

description

HPE NonStop TELSERV is affected by a stack-based buffer overflow that can corrupt memory and cause denial of service. The available scoring information indicates the issue may be reachable over a network without authentication or user interaction; affected versions are not specified in the evidence.

mitigation

Apply any vendor security update or guidance for HPE NonStop TELSERV when available. Until then, reduce exposure by restricting network access to the service to trusted systems.

check
available
exploit
no
automationDeterministic: a check that runs on its own, the same request on every target. Contextual: an agentic technique that needs to be applied per target, for bugs that depend on contextual flows.
deterministic
auth requiredWhether an attacker needs an account first, based on the CVSS vector's Privileges Required.
no
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
0.27%17th percentile
agent run time
8m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-10-15 02:16Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
–
Δ to kevAttacks confirmed in the real world.
–

outcome

Contextual check: a technique exists and was validated, but no deterministic check could cover this one.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

  1. 2026-10-15 02:16Z
    cve_org: trigger signal, started the run

this entry in the feed

GET /api/v1/feed/CVE-2026-76663

{
  "etk_id": "ETK-2026-1876",
  "cve_id": "CVE-2026-76663",
  "display_id": "CVE-2026-76663",
  "ghsa_id": "GHSA-9rwj-hh6p-x6gp",
  "euvd_id": "EUVD-2026-101815",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Stack-based buffer overflow in HPE NonStop TELSERV",
  "summary": "HPE NonStop TELSERV is affected by a stack-based buffer overflow that can corrupt memory and cause denial of service. The available scoring information indicates the issue may be reachable over a network without authentication or user interaction; affected versions are not specified in the evidence.",
  "mitigation": "Apply any vendor security update or guidance for HPE NonStop TELSERV when available. Until then, reduce exposure by restricting network access to the service to trusted systems.",
  "vendor": "Hewlett Packard Enterprise",
  "product": "HPE NonStop TELSERV",
  "affected": [
    {
      "affected_notes": [
        "T9553L01^BAJ and earlier"
      ],
      "affected_ranges": [],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "HPE NonStop TELSERV",
      "purl": null
    }
  ],
  "cwes": [
    121
  ],
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss_score": 0.0027,
  "epss_percentile": 0.1768,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 8.207174383333333,
  "t0_at": "2026-10-15T02:16:17.282000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-17T12:45:11.387244+00:00",
      "days": 2.436737329212963,
      "is_lower_bound": false,
      "measured_at": "2026-10-15T02:16:17.282000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-15T02:16:17.282000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-15T02:16:17.282000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-76663"
    }
  }
}

published 2026-10-17 12:37Z
last change 2026-10-21 12:26Z

Need the technical details behind an entry?

Every entry here shows what we attempted and when. The technical details, the generated exploit that fired it and the evidence behind the verdict are not public. Tell us about your use case and we’ll get back to you about extended API access.