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CVE-2026-124560— D-Link DIR-878 HNAP prog.cgi GetCAPTCHAsetting heap-based overflow

Quick assessment

Affected

D-Link DIR-878

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 D-Link DIR-878 固件版本 1.20B05 中发现一个安全漏洞。该漏洞影响 HNAP 处理器组件中文件的函数。攻击者可通过操纵参数引发基于堆的缓冲区溢出。此攻击可远程发起。相关利用代码已公开，可能被恶意利用。该漏洞仅影响不再由维护者提供支持的产品。

CVSS 9.8 · Critical Updated Nov 09, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

D-Link DIR-878 HNAP prog.cgi GetCAPTCHAsetting heap-based overflow

Source: CVE Program / CVE List V5

Vulnerability Description

A vulnerability was found in D-Link DIR-878 1.20B05. This affects the function GetCAPTCHAsetting of the file bin/prog.cgi of the component HNAP Handler. Performing a manipulation of the argument uid results in heap-based buffer overflow. The attack can be initiated remotely. The exploit has been made public and could be used. This vulnerability only affects products that are no longer supported by the maintainer.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

堆缓冲区溢出

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
D-Link	DIR-878	1.20B05	`cpe:2.3:h:d-link:dir-878::::::::`

II. Public POCs for CVE-2026-124560

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-124560

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Vendor Pages for CVE-2026-124560 (1)

Smart Home, SMB and Enterprise solutions | D-Link product

Other References for CVE-2026-124560 (5)

https://github.com/Zimo-666/DIR-878-cves/tree/main/01-captcha-uid-heap-overflow broken-link exploit
https://vuldb.com/cve/CVE-2026-124560 third-party-advisory
https://vuldb.com/vuln/432892/cti signature permissions-required
https://vuldb.com/submit/1035616 third-party-advisory
https://vuldb.com/vuln/432892 vdb-entry technical-description

https://www.cve.org/CVERecord?id=CVE-2026-124560

Same Patch Batch · D-Link · 2026-11-09 · 5 CVEs total

CVE-2026-124563	7.5 HIGH	D-Link DIR-878 HNAP SetWanSettings buffer overflow
CVE-2026-124562	7.5 HIGH	D-Link DIR-878 HNAP SetWanSettings buffer overflow
CVE-2026-124561	7.5 HIGH	D-Link DIR-878 HNAP prog.cgi SetVLANSettings stack-based overflow
CVE-2026-124564	5.3 MEDIUM	D-Link DIR-878 HNAP prog.cgi GetListDirectory path traversal

IV. Related Vulnerabilities

Same product: DIR-878

Same vendor: D-Link

Same weakness: CWE-122