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CVE-2026-42582

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final, when decoding header blocks, the non-Huffman branch of io.netty.handler.codec.http3.QpackDecoder#decodeHuffmanEncodedLiteral may execute new byte[length] for a string literal before verifying that length bytes are actually present in the compressed field section. The wire encoding allows a very large length to be expressed in few bytes. There is no check that length <= in.readableBytes() before new byte[
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:b2318f551aba566e26213dbf0728b79f73398ef1228f4ebd48d9d72d5ca5336e
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"netty","vendor":"netty","versions":[{"status":"affected","version":">= 4.2.0.Alpha1, < 4.2.13.Final"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:4232ca4e29ba13031bc83357f483186683157ed4c89457c5de74d45c8634387d · sha256:2db0df98c84584dc… · /containers/cna/affected/0

{"product":"netty-codec-http3","vendor":"io.netty","versions":[{"status":"affected","version":">= 4.2.0.Alpha1, < 4.2.13.Final"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:4232ca4e29ba13031bc83357f483186683157ed4c89457c5de74d45c8634387d · sha256:2db0df98c84584dc… · /containers/cna/affected/1
cwe · 2 assertions

{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4232ca4e29ba13031bc83357f483186683157ed4c89457c5de74d45c8634387d · sha256:2db0df98c84584dc… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-789","description":"CWE-789: Memory Allocation with Excessive Size Value","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4232ca4e29ba13031bc83357f483186683157ed4c89457c5de74d45c8634387d · sha256:2db0df98c84584dc… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

2 source assertions
{"product":"netty","vendor":"netty","versions":[{"status":"affected","version":">= 4.2.0.Alpha1, < 4.2.13.Final"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:4232ca4e29ba13031bc83357f483186683157ed4c89457c5de74d45c8634387d · sha256:2db0df98c84584dc… · /containers/cna/affected/0
{"product":"netty-codec-http3","vendor":"io.netty","versions":[{"status":"affected","version":">= 4.2.0.Alpha1, < 4.2.13.Final"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:4232ca4e29ba13031bc83357f483186683157ed4c89457c5de74d45c8634387d · sha256:2db0df98c84584dc… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4232ca4e29ba13031bc83357f483186683157ed4c89457c5de74d45c8634387d · sha256:2db0df98c84584dc… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4232ca4e29ba13031bc83357f483186683157ed4c89457c5de74d45c8634387d · sha256:2db0df98c84584dc… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-789","description":"CWE-789: Memory Allocation with Excessive Size Value","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4232ca4e29ba13031bc83357f483186683157ed4c89457c5de74d45c8634387d · sha256:2db0df98c84584dc… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions
{"tags":["exploit"],"url":"https://github.com/netty/netty/security/advisories/GHSA-2c5c-chwr-9hqw"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4232ca4e29ba13031bc83357f483186683157ed4c89457c5de74d45c8634387d · sha256:2db0df98c84584dc… · /containers/adp/0/references/0
{"name":"https://github.com/netty/netty/security/advisories/GHSA-2c5c-chwr-9hqw","tags":["x_refsource_CONFIRM"],"url":"https://github.com/netty/netty/security/advisories/GHSA-2c5c-chwr-9hqw"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4232ca4e29ba13031bc83357f483186683157ed4c89457c5de74d45c8634387d · sha256:2db0df98c84584dc… · /containers/cna/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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