CVE-2026-39832— Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent
Possible ATT&CK Techniques 1AI
T1552.008 · Chat MessagesAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| golang.org/x/crypto | golang.org/x/crypto/ssh/agent | < 0.52.0 | affected |
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I. Basic Information for CVE-2026-39832
Vulnerability Information
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Vulnerability Title
Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent
Source: NVD (National Vulnerability Database)
Vulnerability Description
When adding a key to a remote agent constraint extensions such as restrict-destination-v00@openssh.com 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| golang.org/x/crypto | golang.org/x/crypto/ssh/agent | 0 ~ 0.52.0 | - |
II. Public POCs for CVE-2026-39832
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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Patches & Fixes for CVE-2026-39832 (1)
Vendor Advisories for CVE-2026-39832 (2)
Other References for CVE-2026-39832 (1)
Same Patch Batch · golang.org/x/crypto · 2026-05-22 · 13 CVEs total
| CVE-2026-42508 | Invoking auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts | |
| CVE-2026-39829 | Invoking pathological RSA/DSA parameters may cause DoS in golang.org/x/crypto/ssh | |
| CVE-2026-39835 | Invoking server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh | |
| CVE-2026-39831 | Invoking bypass of FIDO/U2F security keys physical interaction in golang.org/x/crypto/ssh | |
| CVE-2026-39833 | Invoking key constraints not enforced in golang.org/x/crypto/ssh/agent | |
| CVE-2026-39834 | Invoking infinite loop on large channel writes in golang.org/x/crypto/ssh | |
| CVE-2026-39830 | Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ | |
| CVE-2026-39828 | Invoking bypass of certificate restrictions in golang.org/x/crypto/ssh | |
| CVE-2026-39827 | Invoking memory leak when rejecting channels can lead to DoS in golang.org/x/crypto/ssh | |
| CVE-2026-46597 | Invoking byte arithmetic causes underflow and panic in golang.org/x/crypto/ssh | |
| CVE-2026-46598 | Invoking pathological inputs can lead to client panic in golang.org/x/crypto/ssh/agent | |
| CVE-2026-46595 | Invoking VerifiedPublicKeyCallback permissions skip enforcement in golang.org/x/crypto/ss |
IV. Related Vulnerabilities
Same product: golang.org/x/crypto/ssh/agent
Same vendor: golang.org/x/crypto
- CVE-2026-42508
Invoking auth bypass via unenforced @revoked status in gola - CVE-2026-46595
Invoking VerifiedPublicKeyCallback permissions skip enforce - CVE-2026-46598
Invoking pathological inputs can lead to client panic in go - CVE-2026-39834
Invoking infinite loop on large channel writes in golang.or - CVE-2026-39829
Invoking pathological RSA/DSA parameters may cause DoS in g
V. Comments for CVE-2026-39832
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