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CVE-2026-49846— libks has path traversal in kws HTTP parser via URI segment overflow

Quick assessment

Affected
signalwire libks
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.

libks 为 SignalWire C 系列产品提供底层支持。在 2.0.11 版本之前，libks HTTP 请求解析器中的 函数未能拒绝那些路径段数超过其内部规范化缓冲区容量的 URI。规范化步骤会静默地让这些包含嵌入的 “..” 序列的 URI 通过，从而使得任何后续将 URI 与文件系统路径进行拼接的使用方可能出现路径遍历漏洞。2.0.11 版本已修复该问题。

CVSS 7.5 · High EPSS 0.34% · P27

Possible ATT&CK Techniques 1 AI

T1079

Affected Version Matrix 1

VendorProduct Version RangeStatus
signalwire libks < 2.0.11 affected
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I. Basic Information for CVE-2026-49846

Vulnerability Information
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Vulnerability Title
libks has path traversal in kws HTTP parser via URI segment overflow
Source: CVE Program / CVE List V5
Vulnerability Description
libks provides foundational support for signalwire C products. Prior to version 2.0.11, `clean_uri()` in libks's HTTP request parser fails to reject URIs whose path has more segments than its internal canonicalization buffer can hold. The canonicalization step silently passes such URIs through with embedded ".." sequences intact, enabling path traversal in any consumer that later joins the URI with a filesystem path. Version 2.0.11 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
signalwire libks < 2.0.11 -

II. Public POCs for CVE-2026-49846

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III. Intelligence Information for CVE-2026-49846

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Vendor Advisories for CVE-2026-49846 (1)

IV. Related Vulnerabilities

Same vendor: signalwire
Same weakness: CWE-22

V. Comments for CVE-2026-49846

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