Answer in brief
CVE-2026-39833 records a Critical severity vulnerability in Invoking key constraints not enforced in golang.org/x/crypto/ssh/agent. The current sources do not mark it as known exploited. The current feed maps golang.org/x/crypto/golang.org/x/crypto/ssh/agent (generic), golang.org/x/crypto (go), golang.org/x/crypto (go), golang.org/x/crypto/ssh/agent (go). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps golang.org/x/crypto/golang.org/x/crypto/ssh/agent (generic), golang.org/x/crypto (go), golang.org/x/crypto (go), golang.org/x/crypto/ssh/agent (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| golang.org/x/crypto/golang.org/x/crypto/ssh/agentgeneric | >=0 <0.52.0 | 0.52.0 |
| golang.org/x/cryptogo | <0.52.0 | 0.52.0 |
| golang.org/x/cryptogo | >=0 <0.52.0 | 0.52.0 |
| golang.org/x/crypto/ssh/agentgo | <0.52.0 | 0.52.0 |
Published upstream
May 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
The in-memory keyring returned by NewKeyring() silently accepted keys with the ConfirmBeforeUse constraint but never enforced it. The key would sign without any confirmation prompt, with no indication to the caller that the constraint was not in effect. NewKeyring() now returns an error when unsupported constraints are requested.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-39833 records a Critical severity vulnerability in Invoking key constraints not enforced in golang.org/x/crypto/ssh/agent. The current sources do not mark it as known exploited. The current feed maps golang.org/x/crypto/golang.org/x/crypto/ssh/agent (generic), golang.org/x/crypto (go), golang.org/x/crypto (go), golang.org/x/crypto/ssh/agent (go). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps golang.org/x/crypto/golang.org/x/crypto/ssh/agent (generic), golang.org/x/crypto (go), golang.org/x/crypto (go), golang.org/x/crypto/ssh/agent (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| golang.org/x/crypto/golang.org/x/crypto/ssh/agentgeneric | >=0 <0.52.0 | 0.52.0 |
| golang.org/x/cryptogo | <0.52.0 | 0.52.0 |
| golang.org/x/cryptogo | >=0 <0.52.0 | 0.52.0 |
| golang.org/x/crypto/ssh/agentgo | <0.52.0 | 0.52.0 |
Published upstream
May 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
The in-memory keyring returned by NewKeyring() silently accepted keys with the ConfirmBeforeUse constraint but never enforced it. The key would sign without any confirmation prompt, with no indication to the caller that the constraint was not in effect. NewKeyring() now returns an error when unsupported constraints are requested.
Quoted source text, attributed separately from HOL analysis.