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CVE-2026-39409

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, ipRestriction() does not canonicalize IPv4-mapped IPv6 client addresses (e.g. ::ffff:127.0.0.1) before applying IPv4 allow or deny rules. In environments such as Node.js dual-stack, this can cause IPv4 rules to fail to match, leading to unintended authorization behavior. This vulnerability is fixed in 4.12.12.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:e92afd6b41f8145689ccfdd5143359592db8f530b0ab947092b2c99fe5e89ede
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":"< 4.12.12"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ae22a265d394b6a8a3ba79ffc02450e21e94ec7f9bd31d16d7136687b423a33e · sha256:63faefa500e71dc5… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ae22a265d394b6a8a3ba79ffc02450e21e94ec7f9bd31d16d7136687b423a33e · sha256:63faefa500e71dc5… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-180","description":"CWE-180: Incorrect Behavior Order: Validate Before Canonicalize","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ae22a265d394b6a8a3ba79ffc02450e21e94ec7f9bd31d16d7136687b423a33e · sha256:63faefa500e71dc5… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39","tags":["x_refsource_MISC"],"url":"https://github.com/honojs/hono/commit/48fa2233bc092f650119f42df043050737cabf39"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ae22a265d394b6a8a3ba79ffc02450e21e94ec7f9bd31d16d7136687b423a33e · sha256:63faefa500e71dc5… · /containers/cna/references/1
{"name":"https://github.com/honojs/hono/releases/tag/v4.12.12","tags":["x_refsource_MISC"],"url":"https://github.com/honojs/hono/releases/tag/v4.12.12"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ae22a265d394b6a8a3ba79ffc02450e21e94ec7f9bd31d16d7136687b423a33e · sha256:63faefa500e71dc5… · /containers/cna/references/2
{"name":"https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g","tags":["x_refsource_CONFIRM"],"url":"https://github.com/honojs/hono/security/advisories/GHSA-xpcf-pg52-r92g"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ae22a265d394b6a8a3ba79ffc02450e21e94ec7f9bd31d16d7136687b423a33e · sha256:63faefa500e71dc5… · /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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