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Back to active CVEs
Medium · CVSS 4.2CVE-2026-1484

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

Answer in brief

CVE-2026-1484 records a Medium severity (CVSS 4.2) vulnerability in Glib: integer overflow leading to buffer underflow and out-of-bounds write in glib g_base64_encode(). The current sources do not mark it as known exploited. The current feed maps Red Hat/bootc (generic), Red Hat/glib2 (generic), Red Hat/glycin-loaders (generic), Red Hat/librsvg2 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jan 27, 2026Updated Nov 5, 2026Source checked Nov 5, 2026First seen by HOL Nov 5, 2026Material review Nov 5, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.2
Exploitation
Not marked as known exploited
Affected software
9 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 4.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/bootc (generic), Red Hat/glib2 (generic), Red Hat/glycin-loaders (generic), Red Hat/librsvg2 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/bootcgeneric*Not reported
Red Hat/glib2generic*Not reported
Red Hat/glycin-loadersgeneric*Not reported
Red Hat/librsvg2generic*Not reported
Red Hat/loupegeneric*Not reported
Red Hat/mingw-glib2generic*Not reported
Red Hat/papersgeneric*Not reported
Red Hat/rpm-ostreegeneric*Not reported
Siemens/RUGGEDCOM RST2428Pgeneric>=0 <V4.0V4.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/bootc, Red Hat/glib2, Red Hat/glycin-loaders.
  2. 2Review the reported fix. Source-reported 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.

Evidence timeline and material changes

  1. Published upstream

    Jan 27, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 5, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 5, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • Source referencecert-portal.siemens.com
  • Source referencegitlab.gnome.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • WAMR fast interpreter loader heap buffer overflow via constant deduplication mismatchAlso CWE-787
  • ASN1SCC: Out-of-bounds write in BitStream_DecodeConstraintWholeNumber (uPER/ACN)Also CWE-787
  • ASN1SCC: Stack buffer overflow and out-of-bounds read in XER tokenizer NT()Also CWE-787

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-787
Source
CVE List V5
Source checked
Nov 5, 2026
References
4 linked sources
Open source record