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High, CVSS 8.7amended

netty-incubator-codec-ohttp: [OHttpServerCodec] Native Direct-Memory Leak on AEAD Decryption Failure Leads to Gateway Denial of Service

CVE-2026-54251GHSA-vmr9-j6wf-pmh2

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (io.netty.incubator:netty-incubator-codec-ohttp 0.0.23.Final), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2026-54251: 0.51% estimated exploitation activity in the next 30 days; percentile 43.30 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

The netty-incubator-codec-ohttp library implements Oblivious HTTP (OHTTP) gateway and client functionality using Netty's ByteBuf memory management. When an OHTTP gateway processes encrypted client requests, it allocates a pooled direct (native off-heap) ByteBuf to hold the decrypted plaintext before the AEAD tag is verified. If the AEAD tag check fails — meaning the ciphertext is invalid — the decryption method throws a CryptoException, but the allocated buffer is never released because no try/finally block guards the allocation.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-vmr9-j6wf-pmh2

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-vmr9-j6wf-pmh2

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-54251

Advisory: netty-incubator-codec-ohttp: [OHttpServerCodec] Native Direct-Memory Leak on AEAD Decryption Failure Leads to Gateway Denial of Service
IDs: CVE-2026-54251, GHSA-vmr9-j6wf-pmh2
Record: https://patchnext.com/advisories/cve-2026-54251 (revision 3, source checked 26 Oct 2026, 16:54 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: io.netty.incubator:netty-incubator-codec-ohttp 0.0.23.Final. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven io.netty.incubator:netty-incubator-codec-ohttp: affected < 0.0.23.Final; fixed in 0.0.23.Final

## Suggested inspection (read-only)
- Maven io.netty.incubator:netty-incubator-codec-ohttp: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on io.netty.incubator:netty-incubator-codec-ohttp.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-vmr9-j6wf-pmh2 (OSV record GHSA-vmr9-j6wf-pmh2 lists affected ranges: Maven io.netty.incubator:netty-incubator-codec-ohttp >=0 <0.0.23.Final (fixed))
- Verified: https://github.com/advisories/GHSA-vmr9-j6wf-pmh2 (GitHub-reviewed advisory GHSA-vmr9-j6wf-pmh2 lists affected ranges: Maven io.netty.incubator:netty-incubator-codec-ohttp >=0 <0.0.23.Final)

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