CVE-2026-28858Network attack vector

System termination or kernel corruption via Telephony overflow

Published Mar 25, 2026 · Updated Mar 25, 2026

Buffer overflow in Telephony in Apple iOS and iPadOS before 26.4 allows remote attackers to crash devices or corrupt kernel memory. Apple identifies inadequate bounds checking in Telephony but has not published the parser, message type, or buffer operation that mishandles remote input. Reachability requires remote access to the affected telephony path; successful exploitation terminates the system or corrupts kernel memory.

CVSS severity9.8
Critical
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Telephony in Apple iOS and iPadOS before 26.4 allows remote attackers to crash devices or corrupt kernel memory. Apple identifies inadequate bounds checking in Telephony but has not published the parser, message type, or buffer operation that mishandles remote input. Reachability requires remote access to the affected telephony path; successful exploitation terminates the system or corrupts kernel memory.

The record

CVE
CVE-2026-28858
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-120
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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 <26.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=0 <26.4

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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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