Security readout for executives and security teams
Plain-English summary
A critical memory-handling flaw affects listed Android releases. An attacker could potentially compromise a vulnerable device remotely without credentials or user interaction, gaining the ability to run code and threaten data confidentiality, integrity, and availability.
Executive priority
Treat this as an immediate patch-management priority because compromise may require neither credentials nor user action. First establish device and patch-level exposure, then accelerate applicable vendor updates. Escalate unsupported affected devices for isolation or replacement. Current evidence does not establish active exploitation.
Technical view
CVE-2026-49921 describes heap buffer overflows at multiple unspecified locations in Android. The CVSS 3.1 assessment is 9.8: network-accessible, low complexity, no privileges or user interaction required, with potential remote code execution and high confidentiality, integrity, and availability impact.
Likely exposure
Potential exposure includes devices running Android 14, 15, 16, 16-qpr2, or 17. The supplied record does not identify affected components, vulnerable builds, security patch levels, or OEM-specific status, so version checks alone cannot conclusively establish vulnerability.
Exploitation context
The scoring indicates potentially remote, unauthenticated exploitation without user interaction. The supplied sources provide no exploit prerequisites beyond that assessment. The CVE is not identified as KEV-listed, and the bundle contains no evidence of active exploitation or public exploit availability.
Researcher notes
The record maps the issue to CWE-122 and says it occurs in multiple locations, but provides no component names, code paths, triggering input, affected build ranges, or patch commits. Researchers should use the Android bulletin and subsequent vendor disclosures to establish precise boundaries without assuming every device on a listed version remains vulnerable.
Mitigation direction
- Review Google's September 2026 Android bulletin for fixed security patch levels and remediation guidance.
- Prioritize vendor-provided updates for affected Android devices after appropriate compatibility testing.
- Isolate or retire affected devices that cannot receive applicable vendor fixes.
- Monitor Google and device OEM advisories for revised scope or remediation information.
Validation and detection
- Inventory devices running Android 14, 15, 16, 16-qpr2, or 17.
- Record each device's Android security patch level and OEM build identifier.
- Compare patch levels against Google's bulletin and applicable OEM advisories.
- Confirm managed devices successfully installed the applicable vendor update.
- Recheck inventories for vulnerable or unsupported devices after remediation.
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-122: 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-2026-49921 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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://source.android.com/docs/security/bulletin/2026/2026-09-01CVE reference, google_android
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.
Heap-based Buffer Overflow
Heap-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.