Medium severity · published Jan 27, 2026
CVE-2026-1484
Glib: integer overflow leading to buffer underflow and out-of-bounds write in glib g_base64_encode()
4.2
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 6 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 7 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: vendor
RR
RUGGEDCOM RST2428P · Siemens
before V4.0 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-1484
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-1484
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-1484
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2433259
gitlab.gnome.org
https://gitlab.gnome.org/GNOME/glib/-/issues/3870
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-253495.html
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