{"id":"CVE-2026-19499","title":"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 tha…","summary":"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 tha…","severity":"high","cvss":7.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H","cwe":["CWE-122","CWE-787"],"vendor":"The GNU C Library","product":"glibc","affected":["glibc >= 2.38 <= 2.44"],"patched":["hardened_images"],"published":"2026-09-14","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:47.257","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-19499","references":[{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=34510","label":"3ff69d7a-14f2-4f67-a097-88dee7810d18"},{"url":"https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0017","label":"3ff69d7a-14f2-4f67-a097-88dee7810d18"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-19499.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-19499"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2523258"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-19499"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-19499"},{"url":"https://access.redhat.com/errata/RHSA-2026:60865"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00297,"epssPercentile":0.19868,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-14T19:40:33.799943Z"},"scores":{"nvd":7.7,"vendor":6.8},"ingestedAt":"2026-09-14T18:12:17.304Z","slug":"CVE-2026-19499","body":"## Overview\n\nCalling 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:60865** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-08-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:60865)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-19499.json)","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":42.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}