# CVE-2026-39835

## Summary

- **CVE ID:** CVE-2026-39835
- **Severity:** UNKNOWN
- **CVSS Score:** 0.03 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
- **CWE:** N/A
- **Published:** May 22, 2026
- **Last Modified:** Sep 18, 2026

## Description

SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking when these callbacks are nil.

## Affected Products

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

## References

- [CNA](https://go.dev/issue/79563)
- [CNA](https://groups.google.com/g/golang-announce/c/a082jnz-LvI)
- [CNA](https://go.dev/cl/781660)
- [CNA](https://pkg.go.dev/vuln/GO-2026-5015)
- [redhat-SADP](https://access.redhat.com/security/cve/CVE-2026-39835)
- [redhat-SADP](https://bugzilla.redhat.com/show_bug.cgi?id=2480680)
- [redhat-SADP](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39835.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-2026:36199)
- [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-2026:36796)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:37072)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:37123)
- [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-2026:37410)
- [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-2026:37286)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:37296)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:38504)
- [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-2026:41019)
- [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-2026:42146)
- [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-2026:46885)
- [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-2026:47949)
- [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-2026:51036)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:54525)
- [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-2026:59593)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:60520)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:62260)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:65126)
- [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:** 0.50%
- **EPSS Percentile:** 41.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._