CVE-2026-54251Network attack vectorHinoki check available

Gateway denial of service via unreleased plaintext buffers

Published Sep 15, 2026 · Updated Sep 15, 2026

Resource leak in Netty/Incubator/Codec/OHTTP before 0.0.23.Final allows remote attackers to interrupt OHTTP gateway service. OHttpRequestResponseContext.decodeChunk() allocates a pooled direct ByteBuf before AEAD verification and fails to release it when decryptChunk() throws CryptoException for an invalid tag. Repeated unauthenticated encrypted requests with invalid tags consume native off-heap memory until the gateway can no longer serve requests.

CVSS severity8.7
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Resource leak in Netty/Incubator/Codec/OHTTP before 0.0.23.Final allows remote attackers to interrupt OHTTP gateway service. OHttpRequestResponseContext.decodeChunk() allocates a pooled direct ByteBuf before AEAD verification and fails to release it when decryptChunk() throws CryptoException for an invalid tag. Repeated unauthenticated encrypted requests with invalid tags consume native off-heap memory until the gateway can no longer serve requests.

The record

CVE
CVE-2026-54251
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
The Netty Project
Product
Netty/Incubator/Codec/OHTTP
Classifications
CWE-664, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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=< 0.0.23.Final

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Netty Project · Netty/Incubator/Codec/OHTTPversion=< 0.0.23.Final

Published CVSS scores

8.7GitHub Advisory DatabaseCVSS: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-664Improper Control of a Resource Through its Lifetime
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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