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

Status: published. Published: 2026-01-27. Updated: 2026-11-05.

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.

## Remediation

- workaround: 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. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (bootc): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (glib2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (glycin-loaders): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (loupe): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (mingw-glib2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (papers): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (rpm-ostree): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (glib2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (glib2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (glib2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (librsvg2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (mingw-glib2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (bootc): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (glib2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (librsvg2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (mingw-glib2): Version range not reported. Source: CNA: redhat
- Siemens / RUGGEDCOM RST2428P: ≥ 0; < V4.0 (affected, custom). Source: ADP: siemens-SADP

## Severity and prioritization

- CVSS 3.1: 4.2 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L; source: CNA: redhat

- CVSS 3.1: 4.2 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.34% as of 2026-11-05; percentile 27.79%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-787

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-1484 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2433259 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://gitlab.gnome.org/GNOME/glib/-/issues/3870 (CNA: redhat)

- https://cert-portal.siemens.com/productcert/html/ssa-253495.html (ADP: siemens-SADP)

- https://access.redhat.com/security/cve/CVE-2026-1484 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2433259 (secalert@redhat.com)

- https://gitlab.gnome.org/GNOME/glib/-/issues/3870 (secalert@redhat.com)

- https://cert-portal.siemens.com/productcert/html/ssa-253495.html (0b142b55-0307-4c5a-b3c9-f314f3fb7c5e)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-1484; retrieved 2026-11-05; source updated 2026-11-05

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1484; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-1484; retrieved 2026-11-05; source updated Not reported

Revision: eb599a4d449db035e599b5d889043fffa302e51c5fe9b4e5a8f9a24beb59616a

Canonical: https://y2.dev/cve/CVE-2026-1484

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