CVE-2022-34028Public exploit

Interpreter crash via invalid UTF-8 read

Published Jul 18, 2022 · Updated Aug 3, 2024

Denial of service in NGINX njs 0.7.5 allows local users to crash the interpreter by executing a crafted JavaScript file. The Uint8ClampedArray.from conversion path sends a crafted string through njs_string_offset to njs_utf8_next, which performs an invalid memory read. The trigger requires control of trusted JavaScript executed by the njs CLI or loaded through js_import; upstream treats such code as protected configuration, and the demonstrated consequence is a process abort.

CVSS severity7.5
High
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in NGINX njs 0.7.5 allows local users to crash the interpreter by executing a crafted JavaScript file. The Uint8ClampedArray.from conversion path sends a crafted string through njs_string_offset to njs_utf8_next, which performs an invalid memory read. The trigger requires control of trusted JavaScript executed by the njs CLI or loaded through js_import; upstream treats such code as protected configuration, and the demonstrated consequence is a process abort.

The record

CVE
CVE-2022-34028
Published
Jul 18, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 18, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

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No observations available

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

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

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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