Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent
Summary
| CVE | CVE-2026-39832 |
|---|---|
| State | PUBLISHED |
| Assigner | Go |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-22 04:16:22 UTC |
| Updated | 2026-07-10 12:16:45 UTC |
| Description | When adding a key to a remote agent constraint extensions such as [email protected] were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all constraint extensions. Additionally, the in-memory keyring returned by NewKeyring() now rejects keys with unsupported constraint extensions instead of silently ignoring them. |
Risk And Classification
Primary CVSS: v3.1 9.1 CRITICAL from ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS: 0.005250000 probability, percentile 0.407980000 (date 2026-07-12)
Problem Types: CWE-502 | CWE-281 | CWE-281: Improper Preservation of Permissions | CWE-281 Improper Preservation of Permissions
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | DECLARED | 9.1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| 3.1 | ADP | CVSS | 8.7 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N |
| 3.1 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary | 9.1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 8.7 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| groups.google.com/g/golang-announce/c/a082jnz-LvI | [email protected] | groups.google.com | Mailing List |
| access.redhat.com/errata/RHSA-2026:36797 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:36651 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39832.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:37387 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:36199 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | |
| access.redhat.com/errata/RHSA-2026:36319 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:37410 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| go.dev/cl/778642 | [email protected] | go.dev | Issue Tracking |
| go.dev/issue/79435 | [email protected] | go.dev | Issue Tracking |
| access.redhat.com/errata/RHSA-2026:37271 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:37123 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:35833 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:36625 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:36648 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:37072 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:36796 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| pkg.go.dev/vuln/GO-2026-5006 | [email protected] | pkg.go.dev | Vendor Advisory |
| access.redhat.com/security/cve/CVE-2026-39832 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: NCC Group Cryptography Services, sponsored by Teleport (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-05-22T04:01:41.402Z | Reported to Red Hat. |
| ADP | 2026-05-22T02:31:26.660Z | Made public. |
Solutions
ADP: RHSA-2026:36796: RHEM 1.0 for RHEL 9
ADP: RHSA-2026:36199: Red Hat Enterprise Linux AppStream (v. 10)
ADP: RHSA-2026:37072: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
ADP: RHSA-2026:35833: Red Hat Enterprise Linux AppStream (v. 8)
ADP: RHSA-2026:37410: Red Hat Enterprise Linux AppStream (v. 9)
ADP: RHSA-2026:37123: Red Hat Enterprise Linux AppStream (v. 9)
ADP: RHSA-2026:36625: Red Hat Advanced Cluster Security for Kubernetes 4.10
ADP: RHSA-2026:36319: Red Hat Advanced Cluster Security for Kubernetes 4.9
ADP: RHSA-2026:36651: Red Hat Edge Manager 1.0
ADP: RHSA-2026:36648: Red Hat OpenShift Builds 1.7.4
ADP: RHSA-2026:37387: Red Hat Openshift Data Foundation 4.22
ADP: RHSA-2026:36797: Red Hat Trusted Artifact Signer 1.4
ADP: RHSA-2026:37271: Red Hat Trusted Artifact Signer 1.4
Workarounds
ADP: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.