Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| zapping-vbi | libzvbi | ≤ 0.2.45 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | zvbi | 0.2.46-1 | — |
| Debian 13 | zvbi | No fix yet | — |
| Debian 12 | zvbi | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | zvbi | No fix yet | — |
| Ubuntu 26.04 LTS | zvbi | No fix yet | — |
| Ubuntu 14.04 LTS | zvbi | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | zvbi | No fix yet | — |
| Ubuntu Pro 22.04 LTS | zvbi | No fix yet | — |
| Ubuntu Pro 20.04 LTS | zvbi | No fix yet | — |
| Ubuntu Pro 18.04 LTS | zvbi | No fix yet | — |
| Ubuntu Pro 16.04 LTS | zvbi | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | zvbi | 0.2.35-3.6.1 | SUSE-SU-2026:5214-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | zvbi | 0.2.46-2.1 | openSUSE-SU-2026:12394-1 |
Advisories 2
- SUSE-SU-2026:5214-1 Security update for zvbi SUSE / openSUSE Security Updates · Nov 13, 2026
- openSUSE-SU-2026:12394-1 libzvbi-chains0-0.2.46-2.1 on GA media SUSE / openSUSE Security Updates · Nov 3, 2026
References
- https://hackmd.io/@haind-pwn/zvbi-teletext-drcs-mode-oob-write technical-description exploit
- https://github.com/zapping-vbi/zvbi/blob/d3a5ee9f2b047bf16cd1ee5ccf6ec05ee75409d0/src/packet.c#L447 technical-description
- https://github.com/zapping-vbi/zvbi product
- VulnCheck Advisory: libzvbi through 0.2.45 Out-of-Bounds Write via Teletext DRCS convert_drcs third-party-advisory