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CVE-2026-5928

Calling the ungetwc function on a FILE stream with wide characters encoded in a character set that has overlaps between its single byte and multi-byte character encodings, in the GNU C Library version 2.43 or earlier, may result in an attempt to read bytes before an allocated buffer, potentially resulting in unintentional disclosure of neighboring data in the heap, or a program crash. A bug in the wide character pushback implementation (_IO_wdefault_pbackfail in libio/wgenops.c) causes ungetwc(
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:0711227dedc2ab399ef2423021bf29168e02dc12a1a792a62591dd3ae11a8726
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":"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:v2:2fffdae91a98dc267aefed01a444cfda7f927a5679068e5ea29bb3cd9025fe69 · sha256:8be87099fac4e754… · /containers/adp/1/affected/4

{"defaultStatus":"unaffected","product":"glibc","vendor":"The GNU C Library","versions":[{"lessThanOrEqual":"2.43","status":"affected","version":"2.1.1-89","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2fffdae91a98dc267aefed01a444cfda7f927a5679068e5ea29bb3cd9025fe69 · sha256:8be87099fac4e754… · /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:v2:2fffdae91a98dc267aefed01a444cfda7f927a5679068e5ea29bb3cd9025fe69 · sha256:8be87099fac4e754… · /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:v2:2fffdae91a98dc267aefed01a444cfda7f927a5679068e5ea29bb3cd9025fe69 · sha256:8be87099fac4e754… · /containers/adp/1/affected/3

{"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:v2:2fffdae91a98dc267aefed01a444cfda7f927a5679068e5ea29bb3cd9025fe69 · sha256:8be87099fac4e754… · /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:v2:2fffdae91a98dc267aefed01a444cfda7f927a5679068e5ea29bb3cd9025fe69 · sha256:8be87099fac4e754… · /containers/adp/1/affected/0

Affected products and versions

6 source assertions
{"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:v2:2fffdae91a98dc267aefed01a444cfda7f927a5679068e5ea29bb3cd9025fe69 · sha256:8be87099fac4e754… · /containers/adp/1/affected/4
{"defaultStatus":"unaffected","product":"glibc","vendor":"The GNU C Library","versions":[{"lessThanOrEqual":"2.43","status":"affected","version":"2.1.1-89","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2fffdae91a98dc267aefed01a444cfda7f927a5679068e5ea29bb3cd9025fe69 · sha256:8be87099fac4e754… · /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:v2:2fffdae91a98dc267aefed01a444cfda7f927a5679068e5ea29bb3cd9025fe69 · sha256:8be87099fac4e754… · /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:v2:2fffdae91a98dc267aefed01a444cfda7f927a5679068e5ea29bb3cd9025fe69 · sha256:8be87099fac4e754… · /containers/adp/1/affected/3
{"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:v2:2fffdae91a98dc267aefed01a444cfda7f927a5679068e5ea29bb3cd9025fe69 · sha256:8be87099fac4e754… · /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:v2:2fffdae91a98dc267aefed01a444cfda7f927a5679068e5ea29bb3cd9025fe69 · sha256:8be87099fac4e754… · /containers/adp/1/affected/0

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:v2:2fffdae91a98dc267aefed01a444cfda7f927a5679068e5ea29bb3cd9025fe69 · sha256:8be87099fac4e754… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-127","description":"CWE-127 Buffer under-read","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2fffdae91a98dc267aefed01a444cfda7f927a5679068e5ea29bb3cd9025fe69 · sha256:8be87099fac4e754… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2fffdae91a98dc267aefed01a444cfda7f927a5679068e5ea29bb3cd9025fe69 · sha256:8be87099fac4e754… · /containers/adp/1/references/0
{"tags":["exploit"],"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=33998"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2fffdae91a98dc267aefed01a444cfda7f927a5679068e5ea29bb3cd9025fe69 · sha256:8be87099fac4e754… · /containers/adp/0/references/0
{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=33998"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2fffdae91a98dc267aefed01a444cfda7f927a5679068e5ea29bb3cd9025fe69 · sha256:8be87099fac4e754… · /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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