CVE-2026-34639

Code execution via out-of-bounds write

Published May 12, 2026 · Updated May 12, 2026

Out-of-bounds write in Adobe Media Encoder 25.6.4 and earlier and 26.0.2 and earlier allows attackers to execute code via a malicious file. Adobe identifies the memory corruption as an out-of-bounds write but does not disclose the affected parser, file format, or faulty bounds operation. A user must open attacker-supplied media, after which code runs with the user's privileges on Windows or macOS.

CVSS severity7.8
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Adobe Media Encoder 25.6.4 and earlier and 26.0.2 and earlier allows attackers to execute code via a malicious file. Adobe identifies the memory corruption as an out-of-bounds write but does not disclose the affected parser, file format, or faulty bounds operation. A user must open attacker-supplied media, after which code runs with the user's privileges on Windows or macOS.

The record

CVE
CVE-2026-34639
Published
May 12, 2026
Updated
May 12, 2026
Vendor
Adobe
Product
Adobe Media Encoder
Classifications
CWE-787, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=25.6.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Adobe · Adobe Media Encoderversion=0 <=25.6.4

Published CVSS scores

7.8AdobeCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1204.002User Execution: Malicious File
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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