CVE-2026-78222Network attack vectorHinoki check available

Worker crash via null status-text dereference

Published Sep 2, 2026 · Updated Sep 2, 2026

NULL pointer dereference in F5 NGINX JavaScript 0.5.1 through 1.0.0 allows remote attackers to crash an NGINX worker. The ngx_http_js_module fetch response path dereferences a null status-text value when trusted JavaScript reads Response.statusText from a malformed HTTP response. Exploitation requires a configured trusted script to fetch a response that an attacker controls or can influence; the result is a data-plane worker crash, not control-plane access.

CVSS severity8.7
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

NULL pointer dereference in F5 NGINX JavaScript 0.5.1 through 1.0.0 allows remote attackers to crash an NGINX worker. The ngx_http_js_module fetch response path dereferences a null status-text value when trusted JavaScript reads Response.statusText from a malformed HTTP response. Exploitation requires a configured trusted script to fetch a response that an attacker controls or can influence; the result is a data-plane worker crash, not control-plane access.

The record

CVE
CVE-2026-78222
Published
Sep 2, 2026
Updated
Sep 2, 2026
Vendor
F5 Networks
Product
NGINX JavaScript
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.5.1 <1.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · NGINX JavaScriptversion=0.5.1 <1.0.1

Published CVSS scores

7.5F5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7F5CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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