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CVE-2026-39835

Medium priority
Needs evaluation

SSH servers which use CertChecker as a public key callback without setting IsUserAuthority or IsHostAuthority could be caused to panic by a client presenting a certificate. CertChecker now returns an error instead of panicking...

4 affected packages

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

Package 24.04 LTS
golang-go.crypto Needs evaluation
snapd Needs evaluation
lxd Not in release
google-guest-agent Needs evaluation
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CVE-2026-39834

Medium priority
Needs evaluation

When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress....

4 affected packages

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

Package 24.04 LTS
golang-go.crypto Needs evaluation
snapd Needs evaluation
lxd Not in release
google-guest-agent Needs evaluation
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CVE-2026-39833

Medium priority
Needs evaluation

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...

4 affected packages

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

Package 24.04 LTS
golang-go.crypto Needs evaluation
snapd Needs evaluation
lxd Not in release
google-guest-agent Needs evaluation
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CVE-2026-39832

Medium priority
Needs evaluation

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 24.04 LTS
golang-go.crypto Needs evaluation
snapd Needs evaluation
lxd Not in release
google-guest-agent Needs evaluation
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CVE-2026-39831

Medium priority
Needs evaluation

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 24.04 LTS
golang-go.crypto Needs evaluation
snapd Needs evaluation
lxd Not in release
google-guest-agent Needs evaluation
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CVE-2026-39830

Medium priority
Needs evaluation

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 24.04 LTS
golang-go.crypto Needs evaluation
snapd Needs evaluation
lxd Not in release
google-guest-agent Needs evaluation
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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, lxd, google-guest-agent

Package 24.04 LTS
golang-go.crypto Needs evaluation
snapd Needs evaluation
lxd Not in release
google-guest-agent 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, lxd, google-guest-agent

Package 24.04 LTS
golang-go.crypto Needs evaluation
snapd Needs evaluation
lxd Not in release
google-guest-agent 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, lxd, google-guest-agent

Package 24.04 LTS
golang-go.crypto Needs evaluation
snapd Needs evaluation
lxd Not in release
google-guest-agent Needs evaluation
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CVE-2026-5091

Medium priority
Needs evaluation

Catalyst::Plugin::Authentication versions through 0.10024 for Perl is susceptible to timing attacks. These versions use Perl's built-in eq comparison. Discrepencies in timing could be used to guess the underlying hash or password.

1 affected package

libcatalyst-plugin-authentication-perl

Package 24.04 LTS
libcatalyst-plugin-authentication-perl Needs evaluation
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