How severe is CVE-2026-41207?

CVE-2026-41207 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-41207 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-41207?

CVE-2026-41207 affects Netty Netty-incubator-codec-ohttp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-41207?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-41207 have an EU (EUVD) identifier?

Yes. CVE-2026-41207 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34307.

When was CVE-2026-41207 published?

CVE-2026-41207 was published on 2026-06-04 and last updated on 2026-06-17.

CVE-2026-41207

CVE-2026-41207 is a medium-severity vulnerability in Netty Netty-incubator-codec-ohttp with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-330.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.9
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34307
Weakness: CWE-330
Affected product: Netty Netty-incubator-codec-ohttp
Published: 2026-06-04
Last modified: 2026-06-17

Description

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 directly into OHttpCrypto.createResponseAEAD(...). A silent all-zero export secret would produce a deterministic, attacker-predictable AEAD key. Version 0.0.21.Final patches the issue.

Frequently asked questions

What is CVE-2026-41207?: 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 directly into OHttpCrypto.createResponseAEAD(...). A silent all-zero export secret would produce a deterministic, attacker-predictable AEAD key. Version 0.0.21.Final patches the issue.
How severe is CVE-2026-41207?: CVE-2026-41207 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-41207 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-41207?: CVE-2026-41207 affects Netty Netty-incubator-codec-ohttp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-41207?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-41207 have an EU (EUVD) identifier?: Yes. CVE-2026-41207 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34307.
When was CVE-2026-41207 published?: CVE-2026-41207 was published on 2026-06-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:netty:netty-incubator-codec-ohttp:*:*:*:*:*:*:*:*

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