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CVE-2026-44889— WebOb: Location header normalization during redirect leads to open redirect

Quick assessment

Affected
Pylons webob
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.

Pylons Project WebOb是Pylons Project团队的一个WSGI请求和响应对象封装库。 Pylons Project WebOb 1.8.10之前版本存在输入验证错误漏洞，该漏洞源于HTTP Location标头在重定向过程中的规范化问题，可能导致开放重定向，攻击者利用包含特殊字符的重定向目标可发送用户至任意外部站点。

CVSS 6.1 · Medium EPSS 0.27% · P17

Affected Version Matrix 1

VendorProduct Version RangeStatus
Pylons webob < 1.8.10 affected
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I. Basic Information for CVE-2026-44889

Vulnerability Information
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Vulnerability Title
WebOb: Location header normalization during redirect leads to open redirect
Source: CVE Program / CVE List V5
Vulnerability Description
WebOb provides objects for HTTP requests and responses. Prior to 1.8.10, the normalization of the HTTP Location header during a redirect is vulnerable to an open redirect: WebOb joins the redirect target to the request URI using Python's urljoin, and since Python 3.10 the underlying urlsplit strips ASCII tab, carriage return, and newline characters before parsing, so a redirect target containing such characters can be reinterpreted as a protocol-relative URL whose authority is an attacker-controlled host. This bypasses the CVE-2024-42353 fix that escaped a leading double slash, allowing an attacker who influences the redirect location to send users to an arbitrary external site instead of the intended one. This vulnerability is fixed in 1.8.10.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Pylons Project WebOb 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Pylons Project WebOb是Pylons Project团队的一个WSGI请求和响应对象封装库。 Pylons Project WebOb 1.8.10之前版本存在输入验证错误漏洞，该漏洞源于HTTP Location标头在重定向过程中的规范化问题，可能导致开放重定向，攻击者利用包含特殊字符的重定向目标可发送用户至任意外部站点。
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
Pylons webob < 1.8.10 -

II. Public POCs for CVE-2026-44889

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III. Intelligence Information for CVE-2026-44889

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Vendor Advisories for CVE-2026-44889 (1)

IV. Related Vulnerabilities

Same product: webob
Same vendor: Pylons
Same weakness: CWE-601

V. Comments for CVE-2026-44889

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