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CVE-2026-50268— Steeltoe: OAEP setting silently selects PKCS#1 v1.5 padding

Quick assessment

Affected
SteeltoeOSS Steeltoe.Configuration.Encryption
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.

SteeltoeOSS Steeltoe.Configuration.Encryption是SteeltoeOSS的一个配置加密组件。 SteeltoeOSS Steeltoe.Configuration.Encryption 4.0.0版本至4.1.0版本存在信任管理问题漏洞，该漏洞源于BouncyCastle转换字符串不正确，导致OAEP设置选择了PKCS#1 v1.5算法，可能造成信任管理问题和加密问题。

CVSS 1.9 · Low EPSS 0.06% · P0

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
SteeltoeOSS Steeltoe.Configuration.Encryption >= 4.0.0, < 4.2.0 affected
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I. Basic Information for CVE-2026-50268

Vulnerability Information
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Vulnerability Title
Steeltoe: OAEP setting silently selects PKCS#1 v1.5 padding
Source: CVE Program / CVE List V5
Vulnerability Description
Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. In Steeltoe.Configuration.Encryption 4.0.0 through 4.1.0, configuring `encrypt:rsa:algorithm=OAEP` does not enable OAEP encryption. Due to an incorrect BouncyCastle transformation string, the `OAEP` setting selects PKCS#1 v1.5, which is the same algorithm as the `DEFAULT` setting. Steeltoe.Configuration.Encryption version 4.2.0 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
明文存储口令
Source: CVE Program / CVE List V5
Vulnerability Title
SteeltoeOSS Steeltoe.Configuration.Encryption 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SteeltoeOSS Steeltoe.Configuration.Encryption是SteeltoeOSS的一个配置加密组件。 SteeltoeOSS Steeltoe.Configuration.Encryption 4.0.0版本至4.1.0版本存在信任管理问题漏洞，该漏洞源于BouncyCastle转换字符串不正确，导致OAEP设置选择了PKCS#1 v1.5算法，可能造成信任管理问题和加密问题。
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
SteeltoeOSS Steeltoe.Configuration.Encryption >= 4.0.0, < 4.2.0 -

II. Public POCs for CVE-2026-50268

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III. Intelligence Information for CVE-2026-50268

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Patches & Fixes for CVE-2026-50268 (1)

Vendor Advisories for CVE-2026-50268 (1)

Same Patch Batch · SteeltoeOSS · 2026-06-17 · 7 CVEs total

CVE-2026-50194 8.2 HIGH Steeltoe vulnerable to management-port isolation bypass via spoofed Host header
CVE-2026-50196 7.5 HIGH Steeltoe.Discovery.Eureka: Unrecognized DataCenterInfo.Name poisons entire registry fetch
CVE-2026-50200 7.5 HIGH Steeltoe's env sanitizer misses connection strings — leaks embedded DB passwords
CVE-2026-50201 6.5 MEDIUM Steeltoe's sensitive actuators (heapdump/env) only require Restricted permission
CVE-2026-50202 5.9 MEDIUM Steeltoe's static JWKS cache shared across schemes and never invalidated
CVE-2026-50267 4.7 MEDIUM Steeltoe: TLS private keys written to /tmp with default permissions, never deleted

IV. Related Vulnerabilities

Same vendor: SteeltoeOSS
Same weakness: CWE-256

V. Comments for CVE-2026-50268

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