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CVE-2026-19499

Buffer overflow in strfmon and strfmon_l right-justification padding

CVSS 3.1 7.7 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-19499

Published

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. Exploitation 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. At the time of publication, no network-facing application impact is known.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-19499

Published

glibc

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "The GNU C Library",
                    "product": "glibc",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "2.38",
                            "lessThanOrEqual": "2.44",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON