CVE-2026-39832

Aliases:GO-2026-5006GHSA-f5wc-c3c7-36mc
Advisory lineage Upstream: 0 Downstream: 54
Analyzed
Published: 22 May 2026, 02:31
Last modified:22 Jul 2026, 12:08

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.1 CRITICAL
v3.1 (cve.org)
EPSS Score
0.34% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

22 May 2026, 02:31
Published
Vulnerability first disclosed
22 Jul 2026, 12:08
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•CRITICAL•Score: 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Trends

Current EPSS score: 0.34%• Percentile: 26%

Techniques & Countermeasures

  • CWE-502•Deserialization of Untrusted Data

    The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

  • CWE-281•Improper Preservation of Permissions

    The product does not preserve permissions or incorrectly preserves permissions when copying, restoring, or sharing objects, which can cause them to have less restrictive permissions than intended.

Affected Systems

  • golang•crypto

    < 0.52.0

  • golang.org/x•crypto

    < 0.52.0

  • golang.org/x/crypto/ssh•agent

    < 0.52.0

  • golang.org/x/crypto•golang.org/x/crypto/ssh/agent

    < 0.52.0

References (32)