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CVE-2026-44214

eventsource-encoder encodes events as well-formed EventSource/Server Sent Event (SSE) messages. Prior to 1.0.2, eventsource-encoder does not sanitize the event or id fields of an EventSourceMessage before serializing them. An attacker who controls either field can inject arbitrary Server-Sent Events line terminators (\n, \r, or \r\n) and thereby forge additional SSE fields or entire messages on the stream. This vulnerability is fixed in 1.0.2.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d30e0fb8a98c7d1b01d26cc5dea330127e83197e987a33ecb477adc49736b978
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-113","description":"CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:77de749c3b70cc24890085807d5cc9a6a4c6efe6033daee03bc0fd69e33065d6 · sha256:66d1ab57be7f159f… · /containers/cna/problemTypes/1/descriptions/0

{"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:v2:77de749c3b70cc24890085807d5cc9a6a4c6efe6033daee03bc0fd69e33065d6 · sha256:66d1ab57be7f159f… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"eventsource-encoder","vendor":"rexxars","versions":[{"status":"affected","version":"< 1.0.2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:77de749c3b70cc24890085807d5cc9a6a4c6efe6033daee03bc0fd69e33065d6 · sha256:66d1ab57be7f159f… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.8,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:77de749c3b70cc24890085807d5cc9a6a4c6efe6033daee03bc0fd69e33065d6 · sha256:66d1ab57be7f159f… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-113","description":"CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:77de749c3b70cc24890085807d5cc9a6a4c6efe6033daee03bc0fd69e33065d6 · sha256:66d1ab57be7f159f… · /containers/cna/problemTypes/1/descriptions/0
{"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:v2:77de749c3b70cc24890085807d5cc9a6a4c6efe6033daee03bc0fd69e33065d6 · sha256:66d1ab57be7f159f… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"tags":["exploit"],"url":"https://github.com/rexxars/eventsource-encoder/security/advisories/GHSA-m9g3-3g99-mhpx"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:77de749c3b70cc24890085807d5cc9a6a4c6efe6033daee03bc0fd69e33065d6 · sha256:66d1ab57be7f159f… · /containers/adp/0/references/0
{"name":"https://github.com/rexxars/eventsource-encoder/security/advisories/GHSA-m9g3-3g99-mhpx","tags":["x_refsource_CONFIRM"],"url":"https://github.com/rexxars/eventsource-encoder/security/advisories/GHSA-m9g3-3g99-mhpx"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:77de749c3b70cc24890085807d5cc9a6a4c6efe6033daee03bc0fd69e33065d6 · sha256:66d1ab57be7f159f… · /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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