CVE-2026-87733
Quick assessment
Affected
OCaml mirage-crypto-ec
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 mirage-crypto-ec是OCaml团队开源的一款支持椭圆曲线密码学运算的网络加密库。 OCaml mirage-crypto-ec 2.2.0之前版本存在加密问题漏洞，该漏洞源于ECDSA函数{P256,P384,P521}.Dsa.pub_of_octets接受0x00（无穷远点的编码）作为公钥，可能导致无需私钥即可伪造签名。
Possible ATT&CK Techniques 1 AI
T1565 · Data ManipulationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| OCaml | mirage-crypto-ec | < 2.2.0 |
affected |
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I. Basic Information for CVE-2026-87733
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An issue was discovered in the mirage-crypto-ec function before 2.2.0 for OCaml. The ECDSA functions {P256,P384,P521}.Dsa.pub_of_octets accept 0x00, the encoding of the point at infinity, as a public key. With that public key, signatures can be forged without a private key.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
OCaml mirage-crypto-ec 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OCaml mirage-crypto-ec是OCaml团队开源的一款支持椭圆曲线密码学运算的网络加密库。 OCaml mirage-crypto-ec 2.2.0之前版本存在加密问题漏洞，该漏洞源于ECDSA函数{P256,P384,P521}.Dsa.pub_of_octets接受0x00（无穷远点的编码）作为公钥，可能导致无需私钥即可伪造签名。
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 | mirage-crypto-ec | 0 ~ 2.2.0 | - |
|
II. Public POCs for CVE-2026-87733
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-87733 (1)
Same Patch Batch · OCaml · 2026-09-09 · 7 CVEs total
| CVE-2026-87734 | 7.5 HIGH | OCaml utcp 授权问题漏洞 |
| CVE-2026-87732 | 6.2 MEDIUM | OCaml mirage-crypto 加密问题漏洞 |
| CVE-2026-87737 | 5.9 MEDIUM | OCaml mirage-crypto-ec 侧信道信息泄露漏洞 |
| CVE-2026-57825 | 5.7 MEDIUM | OCaml opam 后置链接漏洞 |
| CVE-2026-87736 | 4.3 MEDIUM | OCaml mirage-crypto-ec 缓冲区错误漏洞 |
| CVE-2026-87735 | 4.3 MEDIUM | OCaml mirage-crypto-pk 输入验证错误漏洞 |