Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-111137— libsmi through 0.5.0 Out-of-Bounds Write via smiValueAsString OCTET STRING DEFVAL

Quick assessment

Affected
amartin755 libsmi
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.

libsmi 0.5.0 及更早版本中存在一个堆缓冲区溢出漏洞，位于 lib/smi.c 文件中的 smiValueAsString() 函数。攻击者可通过对 OCTET STRING 类型的值进行十六进制编码，向固定的 1024 字节静态缓冲区写入超出边界的数据，从而触发溢出。 攻击者可构造恶意的 MIB（管理信息库）文件，其中包含一个 DEFVAL（默认值）为 512 字节或更长、且以 0x00 字节开头的 OCTET STRING 值，借此破坏相邻的全局库变量，导致 smidump 或其他使用 libsmi

CVSS 6.1 · Medium EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
amartin755 libsmi ≤ 0.5.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-111137

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
libsmi through 0.5.0 Out-of-Bounds Write via smiValueAsString OCTET STRING DEFVAL
Source: CVE Program / CVE List V5
Vulnerability Description
libsmi through 0.5.0 contains an out-of-bounds write vulnerability in smiValueAsString() in lib/smi.c that allows attackers to overflow a fixed 1024-byte static buffer through hex rendering of OCTET STRING values. Attackers can supply a crafted MIB with an OCTET STRING DEFVAL of 512 or more octets and a leading 0x00 byte to corrupt adjacent library globals and crash smidump or other consumers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/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
amartin755 libsmi 0 ~ 0.5.0 -

II. Public POCs for CVE-2026-111137

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-111137

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-111137 (1)

Security Blog Posts for CVE-2026-111137 (1)

Other References for CVE-2026-111137 (1)

IV. Related Vulnerabilities

Same weakness: CWE-787

V. Comments for CVE-2026-111137

No comments yet

Leave a comment