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CVE-2026-89086

Quick assessment

Affected
OCaml jose
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.

OCaml jose是OCaml团队的一款提供JSON对象签名与加密功能的软件库。 OCaml jose 0.11.0之前版本存在加密问题漏洞，该漏洞源于验证RSA签名时仅确认PKCS #1解码成功，未执行涉及公钥的必要步骤便判定签名有效，可能导致签名验证被绕过。

CVSS 9.1 · Critical EPSS 0.28% · P20

Possible ATT&CK Techniques 1 AI

T1059.005 · Visual Basic

Affected Version Matrix 1

VendorProduct Version RangeStatus
OCaml jose < 0.11.0 affected
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I. Basic Information for CVE-2026-89086

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In the jose package before 0.11.0 for OCaml, library calls to validate an RSA signature only confirm that PKCS #1 decoding succeeds, and proceed to declare the signature valid without the required steps that involve the public key.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
OCaml jose 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OCaml jose是OCaml团队的一款提供JSON对象签名与加密功能的软件库。 OCaml jose 0.11.0之前版本存在加密问题漏洞，该漏洞源于验证RSA签名时仅确认PKCS #1解码成功，未执行涉及公钥的必要步骤便判定签名有效，可能导致签名验证被绕过。
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
OCaml jose 0 ~ 0.11.0 -

II. Public POCs for CVE-2026-89086

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III. Intelligence Information for CVE-2026-89086

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Patches & Fixes for CVE-2026-89086 (1)

Vendor Advisories for CVE-2026-89086 (1)

IV. Related Vulnerabilities

Same product: jose
Same vendor: OCaml
Same weakness: CWE-347