CVE-2026-123615— imgproxy before 4.0.17 Out-of-Bounds Write in ICO Loader

Quick assessment

Affected

imgproxy imgproxy

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.

imgproxy 3.3.0 至 4.0.17 版本在 ICO 加载器的 BMP 头重建过程中存在堆越界读写漏洞（位于中的函数）。当 ICO 条目声明的数据尺寸过小时，会导致未经验证的头字段被读取和写入到已分配缓冲区之外。未认证的远程攻击者可提供特制的 ICO 图像，破坏相邻堆块的元数据，从而触发 glibc 的 abort 机制，导致工作进程崩溃。

CVSS 7.5 · High Updated Nov 08, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

imgproxy before 4.0.17 Out-of-Bounds Write in ICO Loader

Source: CVE Program / CVE List V5

Vulnerability Description

imgproxy 3.3.0 before 4.0.17 contains an out-of-bounds heap read and write in the ICO loader's BMP header reconstruction (vips_foreign_load_ico_header in vips/icoload.c) when an ICO entry declares a tiny data size, causing unvalidated header fields to be read and written past the allocated buffer. Unauthenticated remote attackers can supply a crafted ICO image to corrupt adjacent heap chunk metadata, triggering a glibc abort that crashes the worker.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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
imgproxy	imgproxy	3.3.0 ~ 4.0.17	-

II. Public POCs for CVE-2026-123615

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-123615

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Other References for CVE-2026-123615 (2)

https://github.com/imgproxy/imgproxy/security/advisories/GHSA-494m-4556-wf5p vendor-advisory
https://www.vulncheck.com/advisories/imgproxy-before-4.0.17-out-of-bounds-write-in-ico-loader third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-123615

Same Patch Batch · imgproxy · 2026-11-08 · 3 CVEs total

CVE-2026-123614	9.8 CRITICAL	imgproxy 4.0.0 before 4.0.16 Heap Buffer Overflow via ICO Loader Integer Overflow
CVE-2026-123616	7.5 HIGH	imgproxy 3.3.0 before 4.0.16 Memory Exhaustion DoS via ICO Loader

IV. Related Vulnerabilities

Same product: imgproxy

Same vendor: imgproxy

Same weakness: CWE-787