CVE-2026-39832CRITICAL 9.1EPSS p45.4%

CVE-2026-39832CVE-2026-39832

golang / crypto

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.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS0.60% probability of exploitation · percentile 45.4% · 2026-08-03T12:00:16Z
Published2026-05-22
Last modified2026-08-03

References

  1. https://go.dev/cl/778642
  2. https://go.dev/issue/79435
  3. https://groups.google.com/g/golang-announce/c/a082jnz-LvI
  4. https://pkg.go.dev/vuln/GO-2026-5006

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.