Out-of-Bounds Write Vulnerability in libzvbi Teletext Decoder
CVE-2026-110654

6.9MEDIUM

Key Information:

Vendor

Zapping-vbi

Status
Libzvbi
Vendor
CVE Published:
14 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-110654?

libzvbi versions up to 0.2.45 are susceptible to an out-of-bounds write vulnerability within the Teletext decoder. By supplying unvalidated DRCS pixel-mode values in X/28/3 packets, attackers can manipulate memory allocation. When a crafted Teletext stream is decoded via vbi_decode, setting each slot to DRCS_MODE_6_5_4 leads to an overflow in the convert_drcs function, compromising the application and potentially leading to crashes.

Affected Version(s)

libzvbi 0 <= 0.2.45

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-110654 - Proof of Concept

References

https://hackmd.io/@haind-pwn/zvbi-teletext-drcs-mode-oob-...
technical-descriptionexploit
https://github.com/zapping-vbi/zvbi/blob/d3a5ee9f2b047bf1...
technical-description
https://github.com/zapping-vbi/zvbi
product

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

HaiND from the Post and Telecommunication Institute of Technology
.