Analyst readout for executives and security teams
Plain-English summary
This is a high-severity Chrome on iOS memory-safety flaw. A remote attacker could potentially run code if they can get a user to open crafted HTML and perform specific UI gestures. The available sources do not show active exploitation or broad technical detail.
Executive priority
Treat this as a near-term mobile browser patching priority, not a confirmed incident. The business risk is highest for executives, administrators, and staff using iOS Chrome to access sensitive systems or untrusted links.
Technical view
CVE-2026-9956 is a CWE-416 use-after-free in Google Chrome on iOS before 148.0.7778.216. The CVE states it can allow arbitrary code execution through crafted HTML with required user interaction. CVSS is 7.5 with network attack vector, high attack complexity, no privileges, and user interaction required.
Likely exposure
Organizations are exposed where users run Chrome on iOS versions before 148.0.7778.216. Exposure is most relevant for managed or BYOD iPhones and iPads that browse untrusted web content. The source bundle provides no CPEs, so asset matching may require mobile inventory data.
Exploitation context
The bundle does not report KEV listing or active exploitation. Exploitation requires a remote attacker to convince a user to interact with a crafted HTML page using specific UI gestures, which reduces reliability but remains serious because the stated impact is arbitrary code execution.
Researcher notes
Public detail is limited. The Chromium issue reference may not expose full technical context, and the bundle provides no CPEs or exploit evidence. Validation should focus on version inventory, vendor advisory tracking, and confirming whether iOS Chrome is present in relevant device populations.
Mitigation direction
- Update Chrome on iOS to 148.0.7778.216 or later where available.
- Check Google Chrome release guidance for deployment-specific instructions.
- Use MDM controls to enforce minimum Chrome versions on managed iOS devices.
- Prioritize users who browse untrusted links or handle sensitive data.
Validation and detection
- Inventory Chrome on iOS versions across managed and BYOD devices.
- Flag any installation below 148.0.7778.216 as exposed.
- Confirm MDM compliance policies enforce the minimum fixed version.
- Review vendor advisories for any updated remediation or exploitation notes.
Public sources used
Based on public source material and reviewed before publication.
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-2026-9956 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
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/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:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H 1.6 5.9 CISA-ADP Vulnerability scoring details
Base CVSS 3.1 score
7.5 HighVector: CVSS:3.1/AV:N/AC:H/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 reserved CVE Program
The CVE ID was reserved by the assigning CNA.
- CVE published CVE Program
The CVE record was published.
- CVE updated CVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 source CVE List V5
- https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html CVE reference, Chrome
- https://issues.chromium.org/issues/504195132 CVE reference, Chrome
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.