CVE-2026-123976— EDFbrowser before 2.16 Out-of-Bounds Write via check_edf_file() Annotation Signals

Quick assessment

Affected

Teunis van Beelen EDFbrowser

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.

EDFbrowser 2.16 之前的版本在函数中存在一个越界写入漏洞。攻击者可以通过提供过多的注释信号（annotation signals），使长度为 256 的数组发生溢出。攻击者可构造包含超过 256 个注释信号的 EDF+ 或 BDF+ 文件，从而覆盖结构体的成员（包括信号参数指针），导致应用程序在打开该文件时崩溃。

CVSS 5.5 · Medium Updated Nov 07, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

Vendor	Product	Version Range	Status
Teunis van Beelen	EDFbrowser	`< 2.16`	affected

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Vulnerability Information

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Vulnerability Title

EDFbrowser before 2.16 Out-of-Bounds Write via check_edf_file() Annotation Signals

Source: CVE Program / CVE List V5

Vulnerability Description

EDFbrowser before 2.16 contains an out-of-bounds write vulnerability in check_edf_file() that allows attackers to overflow the 256-element annot_ch array by supplying excessive annotation signals. Attackers can craft an EDF+ or BDF+ file with more than 256 annotation signals to overwrite edfhdrblock members, including the signal parameter pointer, crashing the application when opened.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

跨界内存写

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Teunis van Beelen	EDFbrowser	0 ~ 2.16	-

II. Public POCs for CVE-2026-123976

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-123976

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Other References for CVE-2026-123976 (6)

https://gitlab.com/Teuniz/EDFbrowser product
https://gitlab.com/Teuniz/EDFbrowser/-/commit/f64cec4a22af34adb7bbdf5fec12cb3a880ddc5a patch
https://gitlab.com/Teuniz/EDFbrowser/-/tags/v2.16 release-notes
https://gitlab.com/Teuniz/EDFbrowser/-/blob/v2.15/global.h#L250 technical-description
https://gitlab.com/Teuniz/EDFbrowser/-/blob/v2.15/check_edf_file.c#L686-L708 technical-description
https://www.vulncheck.com/advisories/edfbrowser-before-2.16-out-of-bounds-write-via-check-edf-file-annotation-signals third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-123976

IV. Related Vulnerabilities

Same weakness: CWE-787