---
id: CVE-2026-110654
title: >-
  libzvbi through 0.2.45 contains an out-of-bounds write vulnerability in the
  Teletext decoder that allows attackers to corrupt memory by supplying
  unvalidated DRCS pixel-mode values in X/28/3 packets
summary: >-
  libzvbi through 0.2.45 contains an out-of-bounds write vulnerability in the
  Teletext decoder that allows attackers to corrupt memory by supplying
  unvalidated DRCS pixel-mode values in X/28/3 packets. Attackers can send a
  crafted Teletext…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H'
cwe:
  - CWE-787
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T16:17:42.070'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110654'
references:
  - url: 'https://github.com/zapping-vbi/zvbi'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/zapping-vbi/zvbi/blob/d3a5ee9f2b047bf16cd1ee5ccf6ec05ee75409d0/src/packet.c#L447
    label: disclosure@vulncheck.com
  - url: 'https://hackmd.io/@haind-pwn/zvbi-teletext-drcs-mode-oob-write'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/libzvbi-through-0.2.45-out-of-bounds-write-via-teletext-drcs-convert-drcs
    label: disclosure@vulncheck.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-110654.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-110654'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-110654'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - exploit-available
ingestedAt: '2026-10-14T16:40:32.112Z'
vendor: zapping-vbi
product: libzvbi
affected:
  - libzvbi <= 0.2.45
epss: 0.0017
epssPercentile: 0.06385
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-20T01:25:53.736590Z'
---

## Overview

libzvbi through 0.2.45 contains an out-of-bounds write vulnerability in the Teletext decoder that allows attackers to corrupt memory by supplying unvalidated DRCS pixel-mode values in X/28/3 packets. Attackers can send a crafted Teletext stream decoded via vbi_decode with every slot set to DRCS_MODE_6_5_4, causing convert_drcs to overflow chars[48][60] and crash the application.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-110654.json)