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CVE-2026-33128

H3 is a minimal H(TTP) framework. In versions prior to 1.15.6 and between 2.0.0 through 2.0.1-rc.14, createEventStream is vulnerable to Server-Sent Events (SSE) injection due to missing newline sanitization in formatEventStreamMessage() and formatEventStreamComment(). An attacker who controls any part of an SSE message field (id, event, data, or comment) can inject arbitrary SSE events to connected clients. This issue is fixed in versions 1.15.6 and 2.0.1-rc.15.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:144f80e6101542e0498558671f729b8b2dbdc0e7c8396a8ef4dbef1b0805d49b
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"h3","vendor":"h3js","versions":[{"status":"affected","version":">= 2.0.0, < 2.0.1-rc.15"},{"status":"affected","version":"< 1.15.6"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:88bddd8f11b8d6b93333e165ba659126689c921492121b955692ae595432697e · sha256:2ff386d0814ec9db… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:88bddd8f11b8d6b93333e165ba659126689c921492121b955692ae595432697e · sha256:2ff386d0814ec9db… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-93","description":"CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:88bddd8f11b8d6b93333e165ba659126689c921492121b955692ae595432697e · sha256:2ff386d0814ec9db… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/h3js/h3/blob/52c82e18bb643d124b8b9ec3b1f62b081f044611/src/utils/internal/event-stream.ts#L170-L187","tags":["x_refsource_MISC"],"url":"https://github.com/h3js/h3/blob/52c82e18bb643d124b8b9ec3b1f62b081f044611/src/utils/internal/event-stream.ts#L170-L187"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:88bddd8f11b8d6b93333e165ba659126689c921492121b955692ae595432697e · sha256:2ff386d0814ec9db… · /containers/cna/references/2
{"name":"https://github.com/h3js/h3/commit/7791538e15ca22437307c06b78fa155bb73632a6","tags":["x_refsource_MISC"],"url":"https://github.com/h3js/h3/commit/7791538e15ca22437307c06b78fa155bb73632a6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:88bddd8f11b8d6b93333e165ba659126689c921492121b955692ae595432697e · sha256:2ff386d0814ec9db… · /containers/cna/references/1
{"name":"https://github.com/h3js/h3/security/advisories/GHSA-22cc-p3c6-wpvm","tags":["x_refsource_CONFIRM"],"url":"https://github.com/h3js/h3/security/advisories/GHSA-22cc-p3c6-wpvm"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:88bddd8f11b8d6b93333e165ba659126689c921492121b955692ae595432697e · sha256:2ff386d0814ec9db… · /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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