{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-18374","assignerOrgId":"3ff69d7a-14f2-4f67-a097-88dee7810d18","state":"PUBLISHED","assignerShortName":"glibc","dateReserved":"2026-07-30T10:48:56.220Z","datePublished":"2026-08-27T19:20:40.426Z","dateUpdated":"2026-08-28T15:37:10.821Z"},"containers":{"cna":{"providerMetadata":{"orgId":"3ff69d7a-14f2-4f67-a097-88dee7810d18","shortName":"glibc","dateUpdated":"2026-08-27T19:26:33.518Z"},"problemTypes":[{"descriptions":[{"lang":"en","description":"Buffer overflow in fopen mode argument processing"}]},{"descriptions":[{"lang":"en","cweId":"CWE-787","description":"CWE-787 Out-of-bounds write","type":"CWE"}]}],"impacts":[{"capecId":"CAPEC-100","descriptions":[{"lang":"en","value":"CAPEC-100 Overflow Buffers"}]},{"capecId":"CAPEC-47","descriptions":[{"lang":"en","value":"CAPEC-47 Buffer Overflow via Parameter Expansion"}]}],"affected":[{"vendor":"The GNU C Library","product":"glibc","versions":[{"status":"affected","version":"0","lessThan":"2.45","versionType":"custom"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"Passing an effectively empty string to the `,ccs=` syntax extension of the mode argument in the `fopen` function in the GNU C Library version 2.45 or earlier may result in a heap buffer overflow when the mode string input to the function is attacker controlled.\n\n\n\nThis usage pattern is not seen in applications in common GNU/Linux distributions and applications that process user-supplied values for `ccs` should not pass them through without validation.","supportingMedia":[{"type":"text/html","base64":false,"value":"Passing an effectively empty string to the `,ccs=` syntax extension of the mode argument in the `fopen` function in the GNU C Library version 2.45 or earlier may result in a heap buffer overflow when the mode string input to the function is attacker controlled.\n<br>\n<br>This usage pattern is not seen in applications in common GNU/Linux distributions and applications that process user-supplied values for `ccs` should not pass them through without validation."}]}],"references":[{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=34574","tags":["issue-tracking"]},{"url":"https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0015","tags":["vendor-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"LOCAL","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"LOW","baseSeverity":"MEDIUM","baseScore":4.9,"vectorString":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"}}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/08/27/6"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2026-08-27T22:21:53.526Z"}},{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-787","lang":"en","description":"CWE-787 Out-of-bounds Write"}]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-28T15:36:48.992608Z","id":"CVE-2026-18374","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-28T15:37:10.821Z"}}]}}