What’s Vulnerable › Vulnerabilities

CVE-2026-1484: Glib: integer overflow leading to buffer underflow and out-of-bounds write in glib g_base64_encode()

• Severity: medium (CVSS 4.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-27 · updated 2026-06-17
• Weakness: CWE-787

Description

A flaw was found in the GLib Base64 encoding routine when processing very large input data. Due to incorrect use of integer types during length calculation, the library may miscalculate buffer boundaries. This can cause memory writes outside the allocated buffer. Applications that process untrusted or extremely large Base64 input using GLib may crash or behave unpredictably.

Affected products

• Red Hat Enterprise Linux 10: all versions
• Red Hat Enterprise Linux 6: all versions
• Red Hat Enterprise Linux 7: all versions
• Red Hat Enterprise Linux 8: all versions
• Red Hat Enterprise Linux 9: all versions

References

• https://access.redhat.com/security/cve/CVE-2026-1484
• https://bugzilla.redhat.com/show_bug.cgi?id=2433259
• https://gitlab.gnome.org/GNOME/glib/-/issues/3870
• https://cert-portal.siemens.com/productcert/html/ssa-253495.html

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