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CVE-2026-53551

free5GC is an open-source implementation of the 5G core network. Prior to 1.4.5, the free5GC AUSF (Authentication Server Function) does not validate the supiOrSuci field in UE authentication requests. Null bytes (\x00) and other control characters pass through JSON parsing unchanged and are forwarded to the UDM in an unescaped URL path. This causes Go's net/url.Parse() to fail, returning HTTP 500 "System failure" and leaking internal stack traces. An unauthenticated attacker can trigger this at
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f86becd108f3a7ad237c041363fe7a0b5893cc1398a0d28ee84d7c87bc1ec1b1
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"ausf","vendor":"free5gc","versions":[{"status":"affected","version":"< 1.4.5"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6067021b839bc40cb8be7b297b175c9831f8eb089f54d2686cd6a492d9fa192d · sha256:74a8400c3ae5b580… · /containers/cna/affected/1

{"product":"free5gc","vendor":"free5gc","versions":[{"status":"affected","version":"< 4.2.2"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6067021b839bc40cb8be7b297b175c9831f8eb089f54d2686cd6a492d9fa192d · sha256:74a8400c3ae5b580… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"product":"ausf","vendor":"free5gc","versions":[{"status":"affected","version":"< 1.4.5"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6067021b839bc40cb8be7b297b175c9831f8eb089f54d2686cd6a492d9fa192d · sha256:74a8400c3ae5b580… · /containers/cna/affected/1
{"product":"free5gc","vendor":"free5gc","versions":[{"status":"affected","version":"< 4.2.2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6067021b839bc40cb8be7b297b175c9831f8eb089f54d2686cd6a492d9fa192d · sha256:74a8400c3ae5b580… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","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:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6067021b839bc40cb8be7b297b175c9831f8eb089f54d2686cd6a492d9fa192d · sha256:74a8400c3ae5b580… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6067021b839bc40cb8be7b297b175c9831f8eb089f54d2686cd6a492d9fa192d · sha256:74a8400c3ae5b580… · /containers/cna/problemTypes/0/descriptions/0

Source references

7 source assertions
{"name":"https://github.com/free5gc/ausf/commit/bfc4a10094dbacbd862baa4686829f3fcc06ce1e","tags":["x_refsource_MISC"],"url":"https://github.com/free5gc/ausf/commit/bfc4a10094dbacbd862baa4686829f3fcc06ce1e"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6067021b839bc40cb8be7b297b175c9831f8eb089f54d2686cd6a492d9fa192d · sha256:74a8400c3ae5b580… · /containers/cna/references/3
{"name":"https://github.com/free5gc/ausf/pull/61","tags":["x_refsource_MISC"],"url":"https://github.com/free5gc/ausf/pull/61"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6067021b839bc40cb8be7b297b175c9831f8eb089f54d2686cd6a492d9fa192d · sha256:74a8400c3ae5b580… · /containers/cna/references/2
{"name":"https://github.com/free5gc/ausf/releases/tag/v1.4.5","tags":["x_refsource_MISC"],"url":"https://github.com/free5gc/ausf/releases/tag/v1.4.5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6067021b839bc40cb8be7b297b175c9831f8eb089f54d2686cd6a492d9fa192d · sha256:74a8400c3ae5b580… · /containers/cna/references/4
{"name":"https://github.com/free5gc/free5gc/issues/1048","tags":["x_refsource_MISC"],"url":"https://github.com/free5gc/free5gc/issues/1048"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6067021b839bc40cb8be7b297b175c9831f8eb089f54d2686cd6a492d9fa192d · sha256:74a8400c3ae5b580… · /containers/cna/references/1
{"name":"https://github.com/free5gc/free5gc/releases/tag/v4.2.2","tags":["x_refsource_MISC"],"url":"https://github.com/free5gc/free5gc/releases/tag/v4.2.2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6067021b839bc40cb8be7b297b175c9831f8eb089f54d2686cd6a492d9fa192d · sha256:74a8400c3ae5b580… · /containers/cna/references/5
{"tags":["exploit"],"url":"https://github.com/free5gc/free5gc/security/advisories/GHSA-qj55-47fp-p62j"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6067021b839bc40cb8be7b297b175c9831f8eb089f54d2686cd6a492d9fa192d · sha256:74a8400c3ae5b580… · /containers/adp/0/references/0
{"name":"https://github.com/free5gc/free5gc/security/advisories/GHSA-qj55-47fp-p62j","tags":["x_refsource_CONFIRM"],"url":"https://github.com/free5gc/free5gc/security/advisories/GHSA-qj55-47fp-p62j"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6067021b839bc40cb8be7b297b175c9831f8eb089f54d2686cd6a492d9fa192d · sha256:74a8400c3ae5b580… · /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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