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CVE-2026-39832

Medium priority

Some fixes available 4 of 14

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...

4 affected packages

golang-go.crypto, snapd, lxd, google-guest-agent

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang-go.crypto Fixed Fixed Fixed Fixed Not affected
snapd Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
lxd Not in release Not in release Not in release Not affected Vulnerable
google-guest-agent Not affected Not affected Not affected Not affected Not affected
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CVE-2026-39831

Medium priority

Some fixes available 10 of 20

The Verify() method for FIDO/U2F security key types (sk-ecdsa-sha2-nistp256@openssh.com, sk-ssh-ed25519@openssh.com) did not check the User Presence flag. Signatures generated without physical touch were accepted, allowing...

4 affected packages

golang-go.crypto, snapd, lxd, google-guest-agent

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang-go.crypto Fixed Fixed Fixed Fixed Not affected
snapd Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
lxd Not in release Not in release Not in release Not affected Vulnerable
google-guest-agent Fixed Fixed Fixed Fixed Fixed
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CVE-2026-39830

Medium priority

Some fixes available 14 of 22

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...

4 affected packages

golang-go.crypto, snapd, lxd, google-guest-agent

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang-go.crypto Fixed Fixed Fixed Fixed Fixed
snapd Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
lxd Not in release Not in release Not in release Not affected Fixed
google-guest-agent Fixed Fixed Fixed Fixed Fixed
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CVE-2026-39829

Medium priority
Needs evaluation

The RSA and DSA public key parsers did not enforce size limits on key parameters. A crafted public key with an excessively large modulus or DSA parameter could cause several minutes of CPU consumption during...

4 affected packages

golang-go.crypto, snapd, google-guest-agent, lxd

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang-go.crypto Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
snapd Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
google-guest-agent Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
lxd Not in release Not in release Not in release Not affected Needs evaluation
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CVE-2026-39828

Medium priority
Needs evaluation

When an SSH server authentication callback returned PartialSuccessError with non-nil Permissions, those permissions were silently discarded, potentially dropping certificate restrictions such as force-command after a second factor...

4 affected packages

golang-go.crypto, snapd, google-guest-agent, lxd

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang-go.crypto Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
snapd Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
google-guest-agent Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
lxd Not in release Not in release Not in release Not affected Needs evaluation
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CVE-2026-39827

Medium priority
Needs evaluation

An authenticated SSH client that repeatedly opened channels which were rejected by the server caused unbounded memory growth, eventually crashing the server process and affecting all connected users. Rejected channels are now...

4 affected packages

golang-go.crypto, snapd, google-guest-agent, lxd

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang-go.crypto Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
snapd Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
google-guest-agent Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
lxd Not in release Not in release Not in release Not affected Needs evaluation
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CVE-2026-3888

High priority
Fixed

Local privilege escalation in snapd on Linux allows local attackers to get root privilege by re-creating snap's private /tmp directory when systemd-tmpfiles is configured to automatically clean up this directory. This issue...

1 affected package

snapd

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
snapd Fixed Fixed Fixed Fixed Fixed
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CVE-2025-58181

Medium priority

Some fixes available 8 of 26

SSH servers parsing GSSAPI authentication requests do not validate the number of mechanisms specified in the request, allowing an attacker to cause unbounded memory consumption.

4 affected packages

golang-go.crypto, snapd, google-guest-agent, lxd

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang-go.crypto Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
snapd Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
google-guest-agent Fixed Fixed Fixed Fixed Fixed
lxd Not in release Not in release Not in release Not affected Needs evaluation
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CVE-2025-47914

Medium priority
Needs evaluation

SSH Agent servers do not validate the size of messages when processing new identity requests, which may cause the program to panic if the message is malformed due to an out of bounds read.

4 affected packages

golang-go.crypto, snapd, google-guest-agent, lxd

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang-go.crypto Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
snapd Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
google-guest-agent Not affected Not affected Not affected Not affected Not affected
lxd Not in release Not in release Not in release Not affected Needs evaluation
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CVE-2025-47913

Medium priority

Some fixes available 6 of 17

SSH clients receiving SSH_AGENT_SUCCESS when expecting a typed response will panic and cause early termination of the client process.

4 affected packages

golang-go.crypto, snapd, google-guest-agent, lxd

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
golang-go.crypto Not affected Fixed Fixed Fixed Fixed
snapd Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
google-guest-agent Not affected Not affected Not affected Not affected Not affected
lxd Not in release Not in release Not in release Not affected Needs evaluation
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