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CVE-2026-49859

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.8.1, when fetch() was called, Deno checked the destination hostname against --deny-net rules but did not re-check the IP addresses that hostname resolved to. An attacker-controlled script could use a specially crafted domain name that passes the hostname check yet resolves to a denied IP, bypassing the network restriction entirely. This vulnerability is fixed in 2.8.1.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:02c973d9974d42b036093a3cca0e4b4572591b45182b5233fd89765d293b6e93
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-693","description":"CWE-693: Protection Mechanism Failure","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:55f2d1412566bb185dba7ec900079b3b87ef047d28a7ef72ff7f72493916e03b · sha256:9603dc71c1ed2dba… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:55f2d1412566bb185dba7ec900079b3b87ef047d28a7ef72ff7f72493916e03b · sha256:9603dc71c1ed2dba… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"deno","vendor":"denoland","versions":[{"status":"affected","version":"< 2.8.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:55f2d1412566bb185dba7ec900079b3b87ef047d28a7ef72ff7f72493916e03b · sha256:9603dc71c1ed2dba… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":5.2,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:55f2d1412566bb185dba7ec900079b3b87ef047d28a7ef72ff7f72493916e03b · sha256:9603dc71c1ed2dba… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-693","description":"CWE-693: Protection Mechanism Failure","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:55f2d1412566bb185dba7ec900079b3b87ef047d28a7ef72ff7f72493916e03b · sha256:9603dc71c1ed2dba… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:55f2d1412566bb185dba7ec900079b3b87ef047d28a7ef72ff7f72493916e03b · sha256:9603dc71c1ed2dba… · /containers/cna/problemTypes/1/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/denoland/deno/security/advisories/GHSA-cpgj-f7g3-2pp2","tags":["x_refsource_CONFIRM"],"url":"https://github.com/denoland/deno/security/advisories/GHSA-cpgj-f7g3-2pp2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:55f2d1412566bb185dba7ec900079b3b87ef047d28a7ef72ff7f72493916e03b · sha256:9603dc71c1ed2dba… · /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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