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CVE-2026-42459

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, the free5GC UDM component fails to validate the supi path parameter in six GET handlers of the nudm-sdm (Subscriber Data Management) service. An unauthenticated attacker can inject control characters into the SUPI parameter, causing UDM to forward a malformed request to UDR and return a 500 Internal Server Error response that exposes internal infrastructure details. This vulnerability is fixed in 4.2.2.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:0ed45bdf702036867f5d39f899631c7bab6cf90fa0fb715308a32fd0587c0220
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-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a8e3e3221cde182badf595dbf6be5fb0cb8a1e97a7a69b33cafe9f224eccaebc · sha256:3e8f484c7f6e49fb… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-209","description":"CWE-209: Generation of Error Message Containing Sensitive Information","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a8e3e3221cde182badf595dbf6be5fb0cb8a1e97a7a69b33cafe9f224eccaebc · sha256:3e8f484c7f6e49fb… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"free5gc","vendor":"free5gc","versions":[{"status":"affected","version":"< 4.2.2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a8e3e3221cde182badf595dbf6be5fb0cb8a1e97a7a69b33cafe9f224eccaebc · sha256:3e8f484c7f6e49fb… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":7.7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a8e3e3221cde182badf595dbf6be5fb0cb8a1e97a7a69b33cafe9f224eccaebc · sha256:3e8f484c7f6e49fb… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a8e3e3221cde182badf595dbf6be5fb0cb8a1e97a7a69b33cafe9f224eccaebc · sha256:3e8f484c7f6e49fb… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-209","description":"CWE-209: Generation of Error Message Containing Sensitive Information","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a8e3e3221cde182badf595dbf6be5fb0cb8a1e97a7a69b33cafe9f224eccaebc · sha256:3e8f484c7f6e49fb… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions
{"tags":["exploit"],"url":"https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a8e3e3221cde182badf595dbf6be5fb0cb8a1e97a7a69b33cafe9f224eccaebc · sha256:3e8f484c7f6e49fb… · /containers/adp/0/references/0
{"name":"https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr","tags":["x_refsource_CONFIRM"],"url":"https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a8e3e3221cde182badf595dbf6be5fb0cb8a1e97a7a69b33cafe9f224eccaebc · sha256:3e8f484c7f6e49fb… · /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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