CVE-2026-39830— Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh
Possible ATT&CK Techniques 1AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| golang.org/x/crypto | golang.org/x/crypto/ssh | < 0.52.0 | affected |
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I. Basic Information for CVE-2026-39830
Vulnerability Information
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Vulnerability Title
Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh
Source: NVD (National Vulnerability Database)
Vulnerability Description
A malicious SSH peer could send unsolicited global request responses to fill an internal buffer, blocking the connection's read loop. The blocked goroutine could not be released by calling Close(), resulting in a resource leak per connection. Unsolicited global responses are now discarded.
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 | 0 ~ 0.52.0 | - |
II. Public POCs for CVE-2026-39830
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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Patches & Fixes for CVE-2026-39830 (3)
Vendor Advisories for CVE-2026-39830 (1)
News Coverage for CVE-2026-39830 (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-2026-39828 | 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-2026-39832 | Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent | |
| 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
- CVE-2026-39834
Invoking infinite loop on large channel writes in golang.or - CVE-2026-46595
Invoking VerifiedPublicKeyCallback permissions skip enforce - CVE-2026-39828
Invoking bypass of certificate restrictions in golang.org/x - CVE-2026-39829
Invoking pathological RSA/DSA parameters may cause DoS in g - CVE-2026-39835
Invoking server panic during CheckHostKey/Authenticate in g
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-2026-39830
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