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CVE-2026-90774— rustypaste before 0.18.1 Path Traversal via filename header

Quick assessment

Affected
orhun rustypaste
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.

Orhun Parmaksız Rustypaste是Orhun Parmaksız个人开发者开源的一款轻量级文件上传与文本粘贴分享服务。 Orhun Parmaksız Rustypaste 0.18.1之前版本存在路径遍历漏洞，该漏洞源于在应用可选自定义文件名HTTP标头之前验证目标路径，导致攻击者可以绕过目录逃逸检查，通过filename标头中的路径遍历序列将文件写入配置上传目录之外的任意位置。

CVSS 7.5 · High EPSS 0.56% · P45

Possible ATT&CK Techniques 1 AI

T1076

Affected Version Matrix 1

VendorProduct Version RangeStatus
orhun rustypaste < 0.18.1 affected
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I. Basic Information for CVE-2026-90774

Vulnerability Information
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Vulnerability Title
rustypaste before 0.18.1 Path Traversal via filename header
Source: CVE Program / CVE List V5
Vulnerability Description
rustypaste before 0.18.1 validates the destination path before applying the optional custom filename HTTP header, allowing attackers to bypass directory-escape checks. Attackers can supply path traversal sequences in the filename header to write files outside the configured upload directory to arbitrary locations.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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
Vulnerability Title
Orhun Parmaksız Rustypaste 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Orhun Parmaksız Rustypaste是Orhun Parmaksız个人开发者开源的一款轻量级文件上传与文本粘贴分享服务。 Orhun Parmaksız Rustypaste 0.18.1之前版本存在路径遍历漏洞，该漏洞源于在应用可选自定义文件名HTTP标头之前验证目标路径，导致攻击者可以绕过目录逃逸检查，通过filename标头中的路径遍历序列将文件写入配置上传目录之外的任意位置。
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
orhun rustypaste 0 ~ 0.18.1 -

II. Public POCs for CVE-2026-90774

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III. Intelligence Information for CVE-2026-90774

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Patches & Fixes for CVE-2026-90774 (2)

Vendor Advisories for CVE-2026-90774 (1)

Vendor Pages for CVE-2026-90774 (1)

Other References for CVE-2026-90774 (1)

IV. Related Vulnerabilities

Same weakness: CWE-22

V. Comments for CVE-2026-90774

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