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CVE-2026-32614— Go ShangMi SM9 Infinity-Point Ciphertext Forgery Vulnerability

Quick assessment

Affected
emmansun gmsm
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.

gmsm是Sun Yimin个人开发者的一个Go语言实现的商用密码算法库。 GMSM 0.41.1之前版本存在数据伪造问题漏洞，该漏洞源于SM9解密实现中存在无穷远点密文伪造漏洞，椭圆曲线点C1在解密时仅被反序列化并检查是否在曲线上，但未明确拒绝无穷远点，可能导致攻击者仅知道目标用户UID即可派生解密密钥材料并伪造通过完整性检查的密文。

CVSS 7.5 · High EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1558 · Steal or Forge Kerberos Tickets
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I. Basic Information for CVE-2026-32614

Vulnerability Information
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Vulnerability Title
Go ShangMi SM9 Infinity-Point Ciphertext Forgery Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Go ShangMi (Commercial Cryptography) Library (GMSM) is a cryptographic library that covers the Chinese commercial cryptographic public algorithms SM2/SM3/SM4/SM9/ZUC. Prior to 0.41.1, the current SM9 decryption implementation contains an infinity-point ciphertext forgery vulnerability. The root cause is that, during decryption, the elliptic-curve point C1 in the ciphertext is only deserialized and checked to be on the curve, but the implementation does not explicitly reject the point at infinity. In the current implementation, an attacker can construct C1 as the point at infinity, causing the bilinear pairing result to degenerate into the identity element in the GT group. As a result, a critical part of the key derivation input becomes a predictable constant. An attacker who only knows the target user's UID can derive the decryption key material and then forge a ciphertext that passes the integrity check. This vulnerability is fixed in 0.41.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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
gmsm 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
gmsm是Sun Yimin个人开发者的一个Go语言实现的商用密码算法库。 GMSM 0.41.1之前版本存在数据伪造问题漏洞，该漏洞源于SM9解密实现中存在无穷远点密文伪造漏洞，椭圆曲线点C1在解密时仅被反序列化并检查是否在曲线上，但未明确拒绝无穷远点，可能导致攻击者仅知道目标用户UID即可派生解密密钥材料并伪造通过完整性检查的密文。
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
emmansun gmsm < 0.41.1 -

II. Public POCs for CVE-2026-32614

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III. Intelligence Information for CVE-2026-32614

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Vendor Advisories for CVE-2026-32614 (1)

IV. Related Vulnerabilities

Same weakness: CWE-347

V. Comments for CVE-2026-32614

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