CVE-2026-41207: The netty incubator codec.bhttp is a java language binary http parser

Q: How do I fix CVE-2026-41207?

netty-incubator-codec-ohttp: upgrade to 0.0.21. Exact commands for each OS are on this page.

Q: Is CVE-2026-41207 being exploited?

CVE-2026-41207 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-41207 affect?

CVE-2026-41207 affects netty-incubator-codec-ohttp. Severity is medium (CVSS 5.3). The netty incubator codec.bhttp is a java language binary http parser. Prior to version 0.0.21.Final, HKDF_expand returns non-NULL on failure. The byte[] is filled with zeros and has no way to distinguish success from failure. Since this ou

Q: How urgent is CVE-2026-41207?

Priority 26/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-41207 is a medium-severity flaw (CVSS 5.3) affecting netty-incubator-codec-ohttp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The netty incubator codec.bhttp is a java language binary http parser. Prior to version 0.0.21.Final, HKDF_expand returns non-NULL on failure. The byte[] is filled with zeros and has no way to distinguish success from failure. Since this output is used as HKDF key material for the response AEAD, a failure silently produces an all-zero key. When EVP_HPKE_CTX_export fails it also returns an empty byte[] array filled with zeros. This byte[] feeds d

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-330
Published	2026-06-04
Last modified	2026-07-22

Publisher (CNA): GitHub, Inc. · Vendor: netty

Last updated 2026-07-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-04 18:16 UTCPublished CVE record published
2026-07-22 20:10 UTCUpdated Record last modified

netty netty-incubator-codec-ohttp UPGRADE

Affected: < 0.0.21

Fixed in: 0.0.21

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy netty-incubator-codec-ohttp || rpm -q netty-incubator-codec-ohttp || netty-incubator-codec-ohttp --version

2. UPGRADE to 0.0.21 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade netty-incubator-codec-ohttp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade netty-incubator-codec-ohttp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-41207?

netty-incubator-codec-ohttp: upgrade to 0.0.21. Exact commands for each OS are on this page.

Is CVE-2026-41207 being exploited?

CVE-2026-41207 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-41207 affect?

CVE-2026-41207 affects netty-incubator-codec-ohttp. Severity is medium (CVSS 5.3). The netty incubator codec.bhttp is a java language binary http parser. Prior to version 0.0.21.Final, HKDF_expand returns non-NULL on failure. The byte[] is filled with zeros and has no way to distinguish success from failure. Since this ou

How urgent is CVE-2026-41207?

Priority 26/100. Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities

Related CVEs

CVE-2026-48040 CRITICAL 9.1 UPGRADE The netty incubator codec.bhttp is a java language binary http parser

References

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