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CVE-2026-49017

Quick assessment

Affected
OpenStack Swift
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.

OpenStack Swift是OpenStack开源的一个分布式对象存储系统。 OpenStack Swift 2.36.2之前版本和2.37.2之前版本存在安全漏洞，该漏洞源于s3api中间件处理截断的aws-chunked PUT请求体时进入无限循环，StreamingInput类重复追加空缓冲区并重新读取，可能导致处理请求的代理服务器工作进程永久无响应并增加CPU和内存消耗，经身份验证的攻击者可系统性地耗尽所有代理服务器工作进程，导致拒绝服务。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.36% · P27

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 3

VendorProduct Version RangeStatus
OpenStack Swift 2.36.0< 2.36.2 affected
2.37.0< 2.37.2 affected
2.35.1< 2.35.3 affected
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I. Basic Information for CVE-2026-49017

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In OpenStack Swift before 2.36.2 and 2.37.2, s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body. The StreamingInput class repeatedly appends an empty buffer and re-reads, causing the proxy-server worker handling the request to become permanently unresponsive with increasing CPU and memory consumption. An authenticated attacker can systematically exhaust all proxy-server workers, resulting in denial of service. The defect was introduced in Swift 2.36.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
OpenStack Swift 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenStack Swift是OpenStack开源的一个分布式对象存储系统。 OpenStack Swift 2.36.2之前版本和2.37.2之前版本存在安全漏洞，该漏洞源于s3api中间件处理截断的aws-chunked PUT请求体时进入无限循环，StreamingInput类重复追加空缓冲区并重新读取，可能导致处理请求的代理服务器工作进程永久无响应并增加CPU和内存消耗，经身份验证的攻击者可系统性地耗尽所有代理服务器工作进程，导致拒绝服务。
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
OpenStack Swift 2.36.0 ~ 2.36.2 -

II. Public POCs for CVE-2026-49017

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III. Intelligence Information for CVE-2026-49017

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Patches & Fixes for CVE-2026-49017 (2)

Other References for CVE-2026-49017 (1)

IV. Related Vulnerabilities

Same product: Swift
Same vendor: OpenStack
Same weakness: CWE-835

V. Comments for CVE-2026-49017

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