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CVE-2026-29085

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, when using streamSSE() in Streaming Helper, the event, id, and retry fields were not validated for carriage return (\r) or newline (\n) characters. Because the SSE protocol uses line breaks as field delimiters, this could allow injection of additional SSE fields within the same event frame if untrusted input was passed into these fields. This issue has been patched in version 4.12.4.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:520cfad749b5da4a626f07c1574e524c246162ac83f4437d979857d1459766b5
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"hono","vendor":"honojs","versions":[{"status":"affected","version":"< 4.12.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:096e63fccdf372e2f8a084b55c76403ab79fd7098f68fbf82377b1bc52dcb532 · sha256:268ae50fb7e86abf… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:096e63fccdf372e2f8a084b55c76403ab79fd7098f68fbf82377b1bc52dcb532 · sha256:268ae50fb7e86abf… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-74","description":"CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:096e63fccdf372e2f8a084b55c76403ab79fd7098f68fbf82377b1bc52dcb532 · sha256:268ae50fb7e86abf… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/honojs/hono/commit/f4123ed9ea3c7c52380cc99a079a4d773838846e","tags":["x_refsource_MISC"],"url":"https://github.com/honojs/hono/commit/f4123ed9ea3c7c52380cc99a079a4d773838846e"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:096e63fccdf372e2f8a084b55c76403ab79fd7098f68fbf82377b1bc52dcb532 · sha256:268ae50fb7e86abf… · /containers/cna/references/1
{"name":"https://github.com/honojs/hono/security/advisories/GHSA-p6xx-57qc-3wxr","tags":["x_refsource_CONFIRM"],"url":"https://github.com/honojs/hono/security/advisories/GHSA-p6xx-57qc-3wxr"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:096e63fccdf372e2f8a084b55c76403ab79fd7098f68fbf82377b1bc52dcb532 · sha256:268ae50fb7e86abf… · /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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