Security readout for executives and security teams
Plain-English summary
A memory-safety flaw in Adobe After Effects can let a malicious file run code with the victim’s user privileges. An attacker must persuade a user to open the file. Successful exploitation could expose data, alter files, or disrupt the workstation.
Executive priority
Treat this as a high-priority endpoint remediation, especially for creative teams receiving files from outside the organization. It requires user action, reducing immediacy compared with unauthenticated remote flaws, but successful exploitation could fully compromise data and operations available to the current user.
Technical view
CVE-2026-21329 is a use-after-free vulnerability, classified as CWE-416, with CVSS 3.1 score 7.8. The vector indicates local delivery, low attack complexity, no prior privileges, required user interaction, unchanged scope, and high confidentiality, integrity, and availability impacts.
Likely exposure
Workstations running After Effects 25.6 or earlier are identified as exposed by the description, particularly where users open externally supplied files. The structured version data also mentions 25.6.4 and 26.0 with an unclear status relationship, so the exact affected-build boundary should be confirmed against Adobe’s advisory.
Exploitation context
Exploitation requires a victim to open a malicious file; this is not described as remotely exploitable without user interaction. The bundle marks the CVE as absent from KEV, and no supplied source states that active exploitation has occurred. Absence from KEV does not prove exploitation is impossible or nonexistent.
Researcher notes
The supplied prose says versions 25.6 and earlier are affected, while the structured affected data lists 25.6.4 and 26.0 without clearly explaining their boundaries. Researchers and vulnerability managers should rely on Adobe’s advisory for authoritative build status. No exploit method, proof of concept, or active-exploitation evidence is included.
Mitigation direction
- Check Adobe’s APSB26-15 advisory for the vendor-designated fixed After Effects release.
- Update affected installations according to Adobe’s published guidance.
- Restrict or scrutinize After Effects files received from untrusted or unexpected sources.
- Prioritize systems handling external creative assets or operating with elevated user privileges.
Validation and detection
- Inventory installed After Effects versions across managed endpoints.
- Compare each detected build with the affected and fixed versions in APSB26-15.
- Confirm updated endpoints report the expected After Effects build after remediation.
- Review endpoint telemetry for suspicious activity following users opening untrusted files.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-21329 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9adobeVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://helpx.adobe.com/security/products/after_effects/apsb26-15.htmlCVE reference, adobe · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.