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CVE-2026-55517

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.7.5, a Deno program that opens a client WebSocket connection could be crashed by the remote server. While handling the WebSocket handshake response, Deno parsed the Sec-WebSocket-Protocol and Sec-WebSocket-Extensions response headers in a way that assumed their bytes were always printable ASCII. A response header containing non-visible-ASCII bytes (0x80-0xFF) caused a panic that aborted the entire Deno process. This vulnerabil
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:70878d26f14c326a327f7e12b4e4bb88a70adb256fe4c245ee19e58408b95017
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"deno","vendor":"denoland","versions":[{"status":"affected","version":"< 2.7.5"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2297d8a5e34aff579a7150cff68015b78fdf04285ee53c07232357173528e8c9 · sha256:52fc908cccb4e4e6… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:2297d8a5e34aff579a7150cff68015b78fdf04285ee53c07232357173528e8c9 · sha256:52fc908cccb4e4e6… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-248","description":"CWE-248: Uncaught Exception","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2297d8a5e34aff579a7150cff68015b78fdf04285ee53c07232357173528e8c9 · sha256:52fc908cccb4e4e6… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/denoland/deno/security/advisories/GHSA-x2qc-cmh9-f4hf","tags":["x_refsource_CONFIRM"],"url":"https://github.com/denoland/deno/security/advisories/GHSA-x2qc-cmh9-f4hf"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2297d8a5e34aff579a7150cff68015b78fdf04285ee53c07232357173528e8c9 · sha256:52fc908cccb4e4e6… · /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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