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CVE-2026-56821

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, the OcspServerCertificateValidator flags an out-of-date OCSP response but does not stop processing it, so an expired GOOD response is still reported as VALID, letting an on-path attacker replay a stale GOOD response to bypass revocation of a since-revoked certificate. Exploitation can lead to certificate revocation bypass via replay of an expired OCSP response. Any application
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:76115e438dcc689dd5a0ddca702edc69b8cc86642dff2c2c813880b36b61183f
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"netty","vendor":"netty","versions":[{"status":"affected","version":"< 4.1.136.Final"},{"status":"affected","version":">= 4.2.0.Final, < 4.2.16.Final"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5e5744f10f67245996fd60d6a7d835f3b1d559fe762b070cbc0851edcfba45c3 · sha256:3d4ea12b086a0a5f… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.4,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5e5744f10f67245996fd60d6a7d835f3b1d559fe762b070cbc0851edcfba45c3 · sha256:3d4ea12b086a0a5f… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-299","description":"CWE-299: Improper Check for Certificate Revocation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5e5744f10f67245996fd60d6a7d835f3b1d559fe762b070cbc0851edcfba45c3 · sha256:3d4ea12b086a0a5f… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/netty/netty/security/advisories/GHSA-g7hg-vrcf-mvmr","tags":["x_refsource_CONFIRM"],"url":"https://github.com/netty/netty/security/advisories/GHSA-g7hg-vrcf-mvmr"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5e5744f10f67245996fd60d6a7d835f3b1d559fe762b070cbc0851edcfba45c3 · sha256:3d4ea12b086a0a5f… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/netty/netty/security/advisories/GHSA-g7hg-vrcf-mvmr"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5e5744f10f67245996fd60d6a7d835f3b1d559fe762b070cbc0851edcfba45c3 · sha256:3d4ea12b086a0a5f… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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