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CVE-2026-75538— A Signed Length Overflow in Erlang/OTP's inet TCP Driver Overflows the Receive Buffer Into BEAM VM Memory From an Unauthenticated Peer

Quick assessment

Affected
Erlang OTP
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.

攻击者若连接到一个开放且使用 驱动并启用 模式的 Erlang TCP 端口，可利用数据包长度计算中的符号溢出漏洞，导致接收缓冲区溢出，影响范围可延伸至 VM 分配器区域，最大可达约 2 GB。 该漏洞会轻易破坏已分配内存块的分配器元数据页脚（footer）以及下一个内存块（如果存在），并极有可能导致 BEAM 虚拟机崩溃。要利用此漏洞以足够精确的方式实现远程代码执行（RCE）极为困难，几乎不可行。 此问题影响以下版本： OTP 17.0 至 OTP 27.3.4.17 之前的版本 OTP 28.0 至 OTP 2

CVSS 8.2 · High
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I. Basic Information for CVE-2026-75538

Vulnerability Information
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Vulnerability Title
A Signed Length Overflow in Erlang/OTP's inet TCP Driver Overflows the Receive Buffer Into BEAM VM Memory From an Unauthenticated Peer
Source: CVE Program / CVE List V5
Vulnerability Description
An attacker that connects to an open Erlang TCP port that uses the inet driver with {packet,4} mode can use a signed overflow in an incorrect packet length calculation to overflow the receive buffer into the VM allocator area and beyond up to about 2 GB. This would easily trash the allocated block's allocator metadata footer, and the next block, if any, and most likely cause the BEAM VM to crash. Utilizing this with precision enough to achieve Remote Code Execution would be extremely unfeasible. This issue affects OTP from OTP 17.0 before OTP 27.3.4.17, from OTP 28.0 before OTP 28.5.0.6, and from OTP 29.0 before OTP 29.0.6, corresponding to erts from 6.0 before 15.2.7.13, from 16.0 before 16.4.0.6, and from 17.0 before 17.0.6. Whether OTP before OTP 17.0, corresponding to erts before 6.0, is affected is unknown.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Erlang OTP 17.0 ~ 27.3.4.17 cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Erlang OTP 6.0 ~ 15.2.7.13 cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Erlang OTP 84adefa331c4159d432d22840663c38f155cd4c1 ~ 08e8efdba8500d2d6f54c6b1de1492b228017c9b cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-75538

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III. Intelligence Information for CVE-2026-75538

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Other References for CVE-2026-75538 (4)

Same Patch Batch · Erlang · 2026-09-01 · 16 CVEs total

CVE-2026-71380 8.7 HIGH httpd applies no timeout while receiving a request body, parking a worker on a stalled cli
CVE-2026-70399 8.7 HIGH httpd does not enforce the documented default max_clients connection limit
CVE-2026-74835 8.7 HIGH inets,httpd: Memory Exhaustion via Unenforced max_body_size During Chunked Body Reception
CVE-2026-69664 8.7 HIGH httpd parks a request worker indefinitely on a malformed chunk size sent after the headers
CVE-2026-66357 8.3 HIGH inets,httpd:HTTP Request Smuggling via obs-fold Header Continuation
CVE-2026-73812 8.3 HIGH inets, httpd: HTTP Request Smuggling via Transfer-Encoding and Content-Length
CVE-2026-73276 8.3 HIGH inets, httpd: HTTP Request Smuggling via Whitespace-Before-Colon Header Dropping i
CVE-2026-55951 8.2 HIGH httpc memory exhaustion via unbounded response header accumulation
CVE-2026-66835 8.2 HIGH httpd mod_auth directory protection bypassed by a doubled slash in the request path
CVE-2026-73270 8.2 HIGH httpd mod_auth directory protection bypassed by request path casing on case-insensitive fi
CVE-2026-59696 6.9 MEDIUM uri_string does not bound the port component of a URI before integer conversion
CVE-2026-71562 6.3 MEDIUM httpc does not bound server-supplied numeric header values before integer conversion
CVE-2026-70405 6.3 MEDIUM snmp BER INTEGER decoder applies no size limit to attacker-supplied integer fields
CVE-2026-70409 6.3 MEDIUM eldap does not bound the port component of a referral URL before integer conversion
CVE-2026-74994 6.0 MEDIUM inets, httpd: Authentication Bypass via Directory Namespace Collapse in httpd mod_auth

IV. Related Vulnerabilities

Same product: OTP
Same vendor: Erlang
Same weakness: CWE-190

V. Comments for CVE-2026-75538

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