CVE-2026-27648Network attack vector

Authenticated code execution via web_webview out-of-bounds write

Published May 19, 2026 · Updated May 19, 2026

Out-of-bounds write in OpenHarmony web_webview 5.0.3 through 6.0 allows remote authenticated users to execute code in pre-installed apps. The public record identifies the web_webview component, whose nweb engine embeds Chromium and CEF, but does not disclose the faulty write operation or crafted input. Low-privileged network access and no user interaction are required; successful memory corruption grants arbitrary code execution in affected pre-installed applications.

CVSS severity8.8
High
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in OpenHarmony web_webview 5.0.3 through 6.0 allows remote authenticated users to execute code in pre-installed apps. The public record identifies the web_webview component, whose nweb engine embeds Chromium and CEF, but does not disclose the faulty write operation or crafted input. Low-privileged network access and no user interaction are required; successful memory corruption grants arbitrary code execution in affected pre-installed applications.

The record

CVE
CVE-2026-27648
Published
May 19, 2026
Updated
May 19, 2026
Vendor
OpenHarmony
Product
OpenHarmony
Classifications
CWE-787
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 19, 2026CVE publishedPublication date reported by the CVE source.
  2. May 19, 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=v5.0.3 <=v6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenHarmony · OpenHarmonyversion=v5.0.3 <=v6.0

Published CVSS scores

8.8OpenHarmonyCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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