Adobe Media Encoder: Out-of-bounds write allows arbitrary code execution
Summary
Adobe Media Encoder versions 26.5.2 and earlier and 25.6.6 and earlier on Windows and macOS contain an out-of-bounds write vulnerability (CWE-787). If a user opens a malicious media file, an attacker can execute arbitrary code in the context of the current user. The attack requires no privileges but depends on the user opening the crafted file, and Adobe reports no exploits in the wild.
Affected
- Adobe Media Encoder 26.5.2 and earlier (Windows and macOS)
- Adobe Media Encoder 25.6.6 and earlier (Windows and macOS)
Fixed in
- Adobe Media Encoder 26.5.3 (26.5 branch)
- Adobe Media Encoder 27.0
- 25.x: the CVE record lists 27.0 as the unaffected version; confirm the upgrade path in APSB26-103.
Workaround
Unknown.
Exploitation
- Adobe states it is not aware of any exploits in the wild for the issues in APSB26-103.
- CISA SSVC: exploitation none, automatable no, technical impact total.
- OffSeq (10 Nov 2026): no evidence of exploitation; no public exploit code indexed.
Our recommendation
- Update Adobe Media Encoder to 27.0 or 26.5.3 via Creative Cloud, depending on the installed branch.
- Check which Media Encoder installations exist on your workstations and their versions.
- Until patched, be cautious with media files from email, downloads and shared drives, and avoid opening files from unknown sources.
- Monitor Adobe's bulletin APSB26-103 and NVD for updates.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Adobe Security Bulletin APSB26-103 www.adobe.com
- CVE Record CVE-2026-113543 www.cve.org
- Zero Day Initiative: November 2026 security update review www.zerodayinitiative.com
- OffSeq threat radar: CVE-2026-113543 radar.offseq.com
- Strix CVE entry CVE-2026-113543 www.strix.ai
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 02:12.
Original description (NVD)
Media Encoder is affected by an out-of-bounds write vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
Affected? We can help.
We check whether your systems are affected, install updates and close the gap – continuously with the System Health Checker if you wish.