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CVE-2026-112273— libtins through 4.6 Heap Out-of-Bounds Read via DNS::compose_name

Quick assessment

Affected
libtins libtins
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.

libtins 4.6 及更早版本在 中的 函数存在堆越界读取漏洞。远程攻击者可通过发送一个标签（label）恰好位于数据包末尾的恶意数据包，从而读取超出数据包缓冲区的内存。攻击者可构造特定的 DNS 数据包，使其附加记录、回答记录或授权记录在解析时触发单字节越界读取，导致使用加固分配器（hardened allocators）的应用程序崩溃。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
libtins libtins ≤ 4.6 affected
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I. Basic Information for CVE-2026-112273

Vulnerability Information
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Vulnerability Title
libtins through 4.6 Heap Out-of-Bounds Read via DNS::compose_name
Source: CVE Program / CVE List V5
Vulnerability Description
libtins through 4.6 contains a heap out-of-bounds read vulnerability in DNS::compose_name in src/dns.cpp that allows remote attackers to read past the packet buffer by sending a label ending exactly at the packet end. Attackers can deliver crafted DNS packets whose additional, answer, or authority records trigger a one-byte read when parsed, crashing applications on hardened allocators.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
libtins libtins 0 ~ 4.6 -

II. Public POCs for CVE-2026-112273

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III. Intelligence Information for CVE-2026-112273

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Vendor Advisories for CVE-2026-112273 (1)

Proof of Concept for CVE-2026-112273 (1)

Vendor Pages for CVE-2026-112273 (1)

IV. Related Vulnerabilities

Same product: libtins
Same vendor: libtins
Same weakness: CWE-125

V. Comments for CVE-2026-112273

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