CVE-2026-65833— iopress: buffer over-read in chunked HTTP parser

Quick assessment

Affected

senapati484 iopress

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.

iopress 是一个为 Node.js 设计的原生 HTTP 服务器，支持平台特定的异步 I/O。在 1.0.5 版本之前，@iopress/core 中的分块传输编码（chunked-transfer-encoding）HTTP 请求解析器在请求声明的分块大小大于实际接收到的请求体时，会读取超出输入缓冲区末尾的数据，从而导致堆缓冲区越界读取（heap-buffer-over-read）漏洞。该问题已在 1.0.5 版本中修复。

CVSS 6.9 · Medium Updated Nov 12, 2026

Possible ATT&CK Techniques 2 AI

T1068 · Exploitation for Privilege Escalation T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

Vendor	Product	Version Range	Status
senapati484	iopress	`< 1.0.5`	affected

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Vulnerability Information

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Vulnerability Title

iopress: buffer over-read in chunked HTTP parser

Source: CVE Program / CVE List V5

Vulnerability Description

iopress is a native HTTP server for Node.js with platform-specific async I/O. Prior to version 1.0.5, the chunked-transfer-encoding HTTP request parser in @iopress/core reads past the end of the input buffer when a request declares a chunk size larger than the body actually received. This results in a heap-buffer-over-read. This issue has been patched in version 1.0.5.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

Source: CVE Program / CVE List V5

Vulnerability Type

缓冲区上溢读取

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
senapati484	iopress	< 1.0.5	-

II. Public POCs for CVE-2026-65833

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-65833

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Other References for CVE-2026-65833 (2)

https://github.com/senapati484/iopress/releases/tag/v1.0.5 x_refsource_MISC
https://github.com/senapati484/iopress/security/advisories/GHSA-pvr5-58cf-rgv6 x_refsource_CONFIRM

https://www.cve.org/CVERecord?id=CVE-2026-65833

IV. Related Vulnerabilities

Same weakness: CWE-126