CVE-2026-19499
Buffer overflow in strfmon and strfmon_l right-justification padding
CVSS Score
7.7
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-122 |
| Vendor | the gnu c library |
| Product | glibc |
| Published | Sep 14, 2026 |
| Last Updated | Sep 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
High
Affected Versions
The GNU C Library / glibc
2.38 ≤ 2.44
References
Credits
AISLE in partnership with Red Hat