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CVE-2026-44983— smallbitvec: Safe API Triggered Heap Buffer Overflow via Integer Overflow

Quick assessment

Affected
servo smallbitvec
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

smallbitvec是Servo开源的一个内联或堆存储的小型位向量。 smallbitvec 1.0.1版本至2.6.0版本存在输入验证错误漏洞，该漏洞源于内部容量计算存在整数溢出，导致堆分配不足，通过安全API即可触发堆缓冲区溢出，造成内存损坏。

CVSS 7.3 · High EPSS 0.16% · P4

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
servo smallbitvec >= 1.0.1, < 2.6.1 affected
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I. Basic Information for CVE-2026-44983

Vulnerability Information
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Vulnerability Title
smallbitvec: Safe API Triggered Heap Buffer Overflow via Integer Overflow
Source: CVE Program / CVE List V5
Vulnerability Description
smallbitvec is a growable bit-vector for Rust, optimized for size. From 1.0.1 to 2.6.0, an integer overflow in the internal capacity calculation of smallbitvec can lead to an undersized heap allocation, resulting in a heap buffer overflow through safe APIs only. This allows memory corruption without requiring unsafe code from the caller. This vulnerability is fixed in 2.6.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
smallbitvec 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
smallbitvec是Servo开源的一个内联或堆存储的小型位向量。 smallbitvec 1.0.1版本至2.6.0版本存在输入验证错误漏洞，该漏洞源于内部容量计算存在整数溢出，导致堆分配不足，通过安全API即可触发堆缓冲区溢出，造成内存损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
servo smallbitvec >= 1.0.1, < 2.6.1 -

II. Public POCs for CVE-2026-44983

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9363 chars
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III. Intelligence Information for CVE-2026-44983

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Vendor Advisories for CVE-2026-44983 (1)

IV. Related Vulnerabilities

Same vendor: servo
Same weakness: CWE-122

V. Comments for CVE-2026-44983

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