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CVE-2026-4437

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, with a crafted response from the configured DNS server, result in a violation of the DNS specification that causes the application to treat a non-answer section of the DNS response as a valid answer.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:92fc95f2e80b7637c9da99d056160ce645c0116f92f88425ff58e9fec403dc11
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 6 assertions

{"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:v2:99ceda8d7d851fa8d0e69f534fb7e417e0489a1c9f0860beed3f5313456b0c60 · sha256:4977407df6563069… · /containers/cna/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:v2:99ceda8d7d851fa8d0e69f534fb7e417e0489a1c9f0860beed3f5313456b0c60 · sha256:4977407df6563069… · /containers/adp/1/affected/1

{"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:v2:99ceda8d7d851fa8d0e69f534fb7e417e0489a1c9f0860beed3f5313456b0c60 · sha256:4977407df6563069… · /containers/adp/1/affected/0

{"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:v2:99ceda8d7d851fa8d0e69f534fb7e417e0489a1c9f0860beed3f5313456b0c60 · sha256:4977407df6563069… · /containers/adp/1/affected/3

{"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:v2:99ceda8d7d851fa8d0e69f534fb7e417e0489a1c9f0860beed3f5313456b0c60 · sha256:4977407df6563069… · /containers/adp/1/affected/4

{"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:v2:99ceda8d7d851fa8d0e69f534fb7e417e0489a1c9f0860beed3f5313456b0c60 · sha256:4977407df6563069… · /containers/adp/1/affected/2

Affected products and versions

6 source assertions
{"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:v2:99ceda8d7d851fa8d0e69f534fb7e417e0489a1c9f0860beed3f5313456b0c60 · sha256:4977407df6563069… · /containers/cna/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:v2:99ceda8d7d851fa8d0e69f534fb7e417e0489a1c9f0860beed3f5313456b0c60 · sha256:4977407df6563069… · /containers/adp/1/affected/1
{"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:v2:99ceda8d7d851fa8d0e69f534fb7e417e0489a1c9f0860beed3f5313456b0c60 · sha256:4977407df6563069… · /containers/adp/1/affected/0
{"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:v2:99ceda8d7d851fa8d0e69f534fb7e417e0489a1c9f0860beed3f5313456b0c60 · sha256:4977407df6563069… · /containers/adp/1/affected/3
{"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:v2:99ceda8d7d851fa8d0e69f534fb7e417e0489a1c9f0860beed3f5313456b0c60 · sha256:4977407df6563069… · /containers/adp/1/affected/4
{"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:v2:99ceda8d7d851fa8d0e69f534fb7e417e0489a1c9f0860beed3f5313456b0c60 · sha256:4977407df6563069… · /containers/adp/1/affected/2

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:99ceda8d7d851fa8d0e69f534fb7e417e0489a1c9f0860beed3f5313456b0c60 · sha256:4977407df6563069… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-125","description":"CWE-125 Out-of-bounds read","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:99ceda8d7d851fa8d0e69f534fb7e417e0489a1c9f0860beed3f5313456b0c60 · sha256:4977407df6563069… · /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:v2:99ceda8d7d851fa8d0e69f534fb7e417e0489a1c9f0860beed3f5313456b0c60 · sha256:4977407df6563069… · /containers/adp/1/references/0
{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=34014"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:99ceda8d7d851fa8d0e69f534fb7e417e0489a1c9f0860beed3f5313456b0c60 · sha256:4977407df6563069… · /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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