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CVE-2026-4438

Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C library version 2.34 to version 2.43 could result in an invalid DNS hostname being returned to the caller in violation of the DNS specification.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:da009743898195b60744b5ca6c222221bd7306607da83538f0438de7f385ce8d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 6 assertions

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"V3.1.6","status":"affected","version":"V3.1.5","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/adp/1/affected/2

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"V3.1.6","status":"affected","version":"V3.1.5","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/adp/1/affected/0

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"V3.1.6","status":"affected","version":"V3.1.5","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/adp/1/affected/1

{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"V3.1.6","status":"affected","version":"V3.1.5","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/adp/1/affected/3

{"defaultStatus":"unaffected","product":"glibc","vendor":"The GNU C Library","versions":[{"lessThanOrEqual":"2.43","status":"affected","version":"2.34","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/cna/affected/0

{"defaultStatus":"unknown","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"V3.1.6","status":"affected","version":"V3.1.5","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/adp/1/affected/4
cwe · 2 assertions

{"cweId":"CWE-88","description":"CWE-88 Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/adp/0/problemTypes/0/descriptions/0

{"cweId":"CWE-20","description":"CWE-20 Improper input validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

6 source assertions
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"V3.1.6","status":"affected","version":"V3.1.5","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/adp/1/affected/2
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"V3.1.6","status":"affected","version":"V3.1.5","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/adp/1/affected/0
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"V3.1.6","status":"affected","version":"V3.1.5","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/adp/1/affected/1
{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"V3.1.6","status":"affected","version":"V3.1.5","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/adp/1/affected/3
{"defaultStatus":"unaffected","product":"glibc","vendor":"The GNU C Library","versions":[{"lessThanOrEqual":"2.43","status":"affected","version":"2.34","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/cna/affected/0
{"defaultStatus":"unknown","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"V3.1.6","status":"affected","version":"V3.1.5","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/adp/1/affected/4

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-88","description":"CWE-88 Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/adp/0/problemTypes/0/descriptions/0
{"cweId":"CWE-20","description":"CWE-20 Improper input validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /containers/adp/1/references/0
{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=34015"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:cb7bce2907d52cfc34342f76d901896fbc9258d89e232bd12cb04a5763b44a45 · sha256:0e6d94c526d23191… · /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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