CVE-2026-48040Network attack vector

Cross-connection data corruption and disclosure via mispositioned pointers

Published Jun 4, 2026 · Updated Jun 4, 2026

Out-of-bounds access in netty-incubator-codec-ohttp before 0.0.22.Final allows remote attackers to corrupt and read pooled buffers. The direct-ByteBuf fallback passes a JNI base address without adding the NIO buffer position, so native cryptography accesses memory outside the intended slice. Reachability requires an OHTTP gateway using pooled direct buffers with Unsafe unavailable; crafted requests can expose adjacent connections and corrupt their data.

CVSS severity9.1
Critical
EPSS probability0.17%
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 access in netty-incubator-codec-ohttp before 0.0.22.Final allows remote attackers to corrupt and read pooled buffers. The direct-ByteBuf fallback passes a JNI base address without adding the NIO buffer position, so native cryptography accesses memory outside the intended slice. Reachability requires an OHTTP gateway using pooled direct buffers with Unsafe unavailable; crafted requests can expose adjacent connections and corrupt their data.

The record

CVE
CVE-2026-48040
Published
Jun 4, 2026
Updated
Jun 4, 2026
Vendor
The Netty Project
Product
Netty/Incubator/Codec/OHTTP
Classifications
CWE-125, CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 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=< 0.0.22.Final

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Netty Project · Netty/Incubator/Codec/OHTTPversion=< 0.0.22.Final

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
6.8GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

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-125Out-of-bounds Read
CWE-787Out-of-bounds Write
T1190Exploit Public-Facing Application

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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