---
title: "CVE-2026-32614: SM9 Infinity-Point Ciphertext Forgery Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-32614/
description: "CVE-2026-32614 (github.com/emmansun/gmsm (Go)): Go ShangMi (Commercial Cryptography) Library (GMSM) is a cryptographic library that covers the Chinese…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-03-13
date_modified: 2026-03-16
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-32614"
kev: false
cvss: 9.2
epss: 0.00239
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-32614: SM9 Infinity-Point Ciphertext Forgery Vulnerability

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.2% , percentile 14: FIRST’s model estimates a 0.2% chance of exploitation activity in the next 30 days, higher than 14% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes github.com/emmansun/gmsm (Go) < 0.41.1, fixed in 0.41.1 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- Go `github.com/emmansun/gmsm` < 0.41.1 → fixed: 0.41.1

## Affected products (CVE record)

- emmansun gmsm: < 0.41.1

## Severity

- GitHub_M CVSS 3.1: 7.5 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`
- GitHub CVSS 4.0: 9.2 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:H/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.24% probability of exploitation activity in the next 30 days; percentile 14.

## Sources

- [GitHub Advisory GHSA-5xxp-2vrj-x855](https://github.com/advisories/GHSA-5xxp-2vrj-x855)
- [CVE.org record CVE-2026-32614](https://www.cve.org/CVERecord?id=CVE-2026-32614)
- [NVD entry CVE-2026-32614](https://nvd.nist.gov/vuln/detail/CVE-2026-32614)
- [github.com](https://github.com/emmansun/gmsm/security/advisories/GHSA-5xxp-2vrj-x855)
- [github.com](https://github.com/emmansun/gmsm/releases/tag/v0.41.1)
- [pkg.go.dev](https://pkg.go.dev/vuln/GO-2026-4694)

---
Source page: https://erroneo.us/security/cve/CVE-2026-32614/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt