---
cve: "CVE-2026-58049"
severity: "HIGH"
cvss: 8.8
epss: "28%"
vendor: "FFMPEG"
kev: false
exploited: false
published: "2026-06-28 02:16:30"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-04T00:11:48+02:00"
---

# CVE-2026-58049

> 8.8 HIGH · 🧪 PoC

## Beschreibung

FFmpeg's RASC video decoder (decode_dlta in libavcodec/rasc.c) performs 32-bit reads and writes at the row cursor before the NEXT_LINE row-boundary check and validates the DLTA region in pixel rather than byte units, so a DLTA run on a PAL8 frame can access several bytes past the row allocation. A crafted media stream using the RASC FourCC, decoded by libavcodec, triggers a bitstream-controlled out-of-bounds heap write and adjacent out-of-bounds read, leading to memory corruption.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Referenzen

- <https://github.com/bikini/exploitarium/tree/main/ffmpeg-rasc-dlta-calc-poc>
- <https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/rasc.c>
- <https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-write-in-rasc-decoder-decode-dlta>
- <https://access.redhat.com/errata/RHSA-2026:43711>
- <https://access.redhat.com/errata/RHSA-2026:51180>
- <https://access.redhat.com/errata/RHSA-2026:52832>
- <https://access.redhat.com/errata/RHSA-2026:52833>
- <https://access.redhat.com/errata/RHSA-2026:60520>
- <https://access.redhat.com/errata/RHSA-2026:61627>
- <https://access.redhat.com/errata/RHSA-2026:61628>
- <https://access.redhat.com/errata/RHSA-2026:61629>
- <https://access.redhat.com/security/cve/CVE-2026-58049>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-58049) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_