{"id":"CVE-2026-19499","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-19499","generatedAt":"2026-10-28T09:27:18.603Z","title":"The field width or format may be attacker-influenced or a fixed susceptible pattern in the caller.","description":"Calling strfmon and strfmon_l in the GNU C Library version 2.38 to 2.44 can write past the end of the caller-supplied output buffer when a conversion uses right-justified width padding.\n\nExploitation requires an application code path that calls strfmon or strfmon_l with right-justified width padding into a destination buffer that is large enough for the padding to succeed but too small for the internal memmove call. The field width or format may be attacker-influenced or a fixed susceptible pattern in the caller.\n\nAt the time of publication, no network-facing application impact is known.","published":"2026-09-14T18:17:46.000Z","lastModified":"2026-09-18T18:17:47.000Z","status":"Awaiting Analysis","sourceIdentifier":"3ff69d7a-14f2-4f67-a097-88dee7810d18","cvss":{"version":"3.1","score":7.7,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H"},"cwe":["CWE-122"],"affected":[],"epss":{"score":0.00297,"percentile":0.22232,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.30%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=34510","source":"3ff69d7a-14f2-4f67-a097-88dee7810d18"},{"url":"https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0017","source":"3ff69d7a-14f2-4f67-a097-88dee7810d18"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-19499","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}