# CVE-2026-39828

## Summary

- **CVE ID:** CVE-2026-39828
- **Severity:** HIGH
- **CVSS Score:** 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** May 22, 2026
- **Last Modified:** Sep 17, 2026

## Description

When an SSH server authentication callback returned PartialSuccessError with non-nil Permissions, those permissions were silently discarded, potentially dropping certificate restrictions such as force-command after a second factor succeeded. Returning non-nil Permissions with PartialSuccessError now results in a connection error.

## Affected Products

- golang.org/x/crypto — golang.org/x/crypto/ssh (0)

## References

- [CNA](https://go.dev/issue/79562)
- [CNA](https://groups.google.com/g/golang-announce/c/a082jnz-LvI)
- [CNA](https://go.dev/cl/781621)
- [CNA](https://pkg.go.dev/vuln/GO-2026-5014)
- [redhat-SADP](https://access.redhat.com/security/cve/CVE-2026-39828)
- [redhat-SADP](https://bugzilla.redhat.com/show_bug.cgi?id=2480687)
- [redhat-SADP](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39828.json)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:26547)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:26546)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36625)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36207)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36319)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36648)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36105)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36167)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36796)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36808)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36651)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36797)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:37271)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:37268)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:37387)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:37272)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:37278)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:37286)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:37296)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:40118)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:40262)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:40974)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:40969)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:40119)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:41019)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:40945)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:41036)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:41031)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:41066)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:40972)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:41055)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:42146)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:42796)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:43692)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:43052)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:46903)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:46885)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:47735)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:48151)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:51033)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:51038)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:52857)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:52910)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:54531)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:57191)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:57194)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:59467)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:60520)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:66521)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:66022)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.37%
- **EPSS Percentile:** 30.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._