Medium [CVE-2026-5450] Heap Buffer Overflow in `scanf` with `%mc` format specifier and large width
This medium-severity Red Hat Linux advisory covers CVE-2026-5450 affecting Red Hat Enterprise Linux 1, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9.
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Summary
Heap Buffer Overflow in `scanf` with `%mc` format specifier and large width. Red Hat rates this moderate (CVSS 5).
Weakness: CWE-131. Affected package(s): glibc, insights-proxy/insights-proxy-container-rhel9:1782890503, glibc-main.
Resolved in Red Hat advisory RHSA-2026:33170 — update the affected packages (`sudo dnf update`).
Affected products named by the advisory: Red Hat Enterprise Linux 1; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 8.
- glibc-0:2.39-126.el10_2
- insights-proxy/insights-proxy-container-rhel9:1782890503
- glibc-0:2.17-326.el7_9.6
- glibc-0:2.34-272.el9_8
- glibc-0:2.34-168.el9_6.25
- glibc-0:2.28-225.el8_8.17
- glibc-0:2.39-46.el10_0.5
- glibc-0:2.28-189.13.el8_6
- glibc-0:2.34-100.el9_4.13
- glibc-0:2.34-60.el9_2.20
- glibc-0:2.28-251.el8_10.38
- glibc-main-2.42-12.hum1
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- RHSA-2026:33170
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Update the affected package(s) to the fixed version shipped in RHSA-2026:33170 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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