# golang.org/x/crypto vulnerable to invoking bypass of certificate restrictions Advisory record · `GHSA-45gg-vh54-h5m9` - **Identifiers:** `GHSA-45gg-vh54-h5m9` · `CVE-2026-39828` · `GO-2026-5014` - **State:** Confirmed - **Severity:** CVSS 6.3 Medium - **Critical:** No - **Weakness (CWE):** [CWE-281](https://cwe.mitre.org/data/definitions/281.html) · [CWE-295](https://cwe.mitre.org/data/definitions/295.html) - **Tags:** [Weak cryptography or TLS](https://agentprime.io/advisories/tag/weak-crypto.md) · [CWE-281](https://agentprime.io/advisories/tag/cwe-281.md) - **Published:** 25 Jun 2026 - **Updated:** 10 Sept 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 25 Jun 2026, 22:14 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `golang.org/x/crypto` (Go): affected `<0.52.0`; fixed in `0.52.0` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > golang.org/x/crypto versions before 0.52.0 are affected. When an SSH server's authentication callback returned PartialSuccessError with non-nil Permissions, those permissions were silently discarded, which could drop certificate restrictions such as force-command after a second factor succeeded. The source does not describe the attacker's required access. Upgrade to version 0.52.0 or later, where returning non-nil Permissions with PartialSuccessError now causes a connection error. Written 1 Nov 2026. ## Not analysed yet We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check. ## Severity and exploitation - 6.3 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`, from GitHub Advisory Database - **CISA KEV:** Not listed. - **EPSS:** 0.0037, the 30th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 31 Oct 2026, 14:13 UTC: First seen by agentprime - 31 Oct 2026, 14:13 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-45gg-vh54-h5m9) ## Sources - [GitHub Advisory Database: GHSA-45gg-vh54-h5m9](https://github.com/advisories/GHSA-45gg-vh54-h5m9) - [OSV: GHSA-45gg-vh54-h5m9](https://osv.dev/vulnerability/GHSA-45gg-vh54-h5m9) - - - - - - - - - - - - Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code. ## Check whether this affects you A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet. - With the agentprime MCP server (), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .