{"id":"CVE-2026-19499","state":"PUBLISHED","title":"Buffer overflow in strfmon and strfmon_l right-justification padding","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.","publishedAt":"2026-09-14T17:11:12.243Z","updatedAt":"2026-09-14T19:40:43.330Z","severity":{"score":7.7,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H","source":"glibc"},"assigner":"glibc","products":["The GNU C Library glibc"],"affected":[{"vendor":"The GNU C Library","product":"glibc","defaultStatus":"unaffected","versions":[{"version":"2.38","status":"affected","lessThanOrEqual":"2.44","versionType":"custom"}]}],"references":["https://sourceware.org/bugzilla/show_bug.cgi?id=34510","https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0017"],"weaknesses":["CWE-122"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/19xxx/CVE-2026-19499.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-19499","state":"PUBLISHED","datePublished":"2026-09-14T17:11:12.243Z","dateUpdated":"2026-09-14T19:40:43.330Z","assignerShortName":"glibc","assignerOrgId":"3ff69d7a-14f2-4f67-a097-88dee7810d18","dateReserved":"2026-08-10T18:42:03.154Z"},"containers":{"cna":{"title":"Buffer overflow in strfmon and strfmon_l right-justification padding","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"The GNU C Library","product":"glibc","defaultStatus":"unaffected","versions":[{"version":"2.38","status":"affected","lessThanOrEqual":"2.44","versionType":"custom"}]}],"references":[{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=34510","tags":["issue-tracking"]},{"url":"https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0017","tags":["vendor-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"LOW","availabilityImpact":"HIGH","baseSeverity":"HIGH","baseScore":7.7,"vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-122","lang":"en","description":"CWE-122 Heap-based buffer overflow","type":"CWE"}]}],"providerMetadata":{"shortName":"glibc","orgId":"3ff69d7a-14f2-4f67-a097-88dee7810d18","dateUpdated":"2026-09-14T17:13:24.311Z"},"datePublic":"2026-08-11T04:00:00.000Z","impacts":[{"capecId":"CAPEC-135","descriptions":[{"lang":"en","value":"CAPEC-135 Format String Injection"}]},{"capecId":"CAPEC-100","descriptions":[{"lang":"en","value":"CAPEC-100 Overflow Buffers"}]}],"credits":[{"lang":"en","value":"AISLE in partnership with Red Hat","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-14T19:40:33.799943Z","id":"CVE-2026-19499","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-14T19:40:43.330Z"}}]}}}