Medium [CVE-2026-19499] Buffer Overflow in strfmon right-justification padding
This medium-severity Red Hat Linux advisory covers CVE-2026-19499 affecting Red Hat Enterprise Linux 10, Red Hat package: glibc.
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Summary
A flaw was found in glibc. The strfmon and strfmon_l functions are vulnerable to a buffer overflow when processing right-justified width padding.
This occurs because an incorrect length is used for an internal memory operation, causing data to be written beyond its intended buffer. An attacker could exploit this by providing specially crafted input, potentially leading to arbitrary code execution or other severe impacts.
This Moderate impact buffer overflow in `strfmon` or `strfmon_l` within glibc occurs when an application uses right-justified width padding with a specific buffer size, leading to an out-of-bounds write.
Exploitation requires a vulnerable application code path that processes attacker-controlled formatting input or uses a fixed susceptible formatting pattern, limiting its general exploitability in typical Red Hat deployments. Red Hat severity: Moderate — CVSS 6.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:H).
Weakness: CWE-787. Affected Red Hat products: Red Hat Enterprise Linux 10.
Under investigation: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Hardened Images; Red Hat OpenShift Container Platform 4. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: glibc.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 53 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 53 minutes ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 53 minutes ago·verify at source
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