CVE-2026-86296Public exploitNetwork attack vector

Unauthenticated memory corruption via Option 125 copy

Published Sep 7, 2026 · Updated Sep 8, 2026

Stack-based buffer overflow in D-Link DIR-822A A_101 allows remote attackers to corrupt memory through a crafted DHCP Option 125 packet. The udhcpcd code in serverpacket.c passes attacker-controlled TR-111 suboption data to strcpy without checking the destination buffer length. The packet must reach the router's DHCP service; successful exploitation corrupts the udhcpcd stack and can interrupt service or redirect execution.

CVSS severityUnavailable
Unscored
EPSS probability1.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in D-Link DIR-822A A_101 allows remote attackers to corrupt memory through a crafted DHCP Option 125 packet. The udhcpcd code in serverpacket.c passes attacker-controlled TR-111 suboption data to strcpy without checking the destination buffer length. The packet must reach the router's DHCP service; successful exploitation corrupts the udhcpcd stack and can interrupt service or redirect execution.

The record

CVE
CVE-2026-86296
Published
Sep 7, 2026
Updated
Sep 8, 2026
Vendor
D-Link
Product
DIR-822A
Classifications
CWE-121, CWE-119, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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=A_101

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · DIR-822Aversion=A_101

Published CVSS scores

9.3National Vulnerability DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P

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

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1190Exploit Public-Facing Application

Public exploit references

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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