Amazon Linux 2023 Security Advisory: ALAS2023-2026-1783
Advisory Released Date: 2026-06-08
Advisory Updated Date: 2026-06-08
FAQs regarding Amazon Linux ALAS/CVE Severity
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 signature verification. This could be triggered by unauthenticated clients during public key authentication. RSA moduli are now limited to 8192 bits, and DSA parameters are validated per FIPS 186-2. (CVE-2026-39829)
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 connection. Unsolicited global responses are now discarded. (CVE-2026-39830)
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 unattended use of a hardware security key. To restore the previous behavior, return a "no-touch-required" extension in Permissions.Extensions from PublicKeyCallback. (CVE-2026-39831)
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. (CVE-2026-39833)
Docker: Race condition in docker cp allows bind mount redirection to host path (CVE-2026-42306)
Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the 'key' and 'key.SignatureKey' are checked for @revoked. (CVE-2026-42508)
Previously, CVE-2024-45337 fixed an authorization bypass for misused ssh server configurations; if any other type of callback is passed other than public key, then the source-address validation would be skipped. (CVE-2026-46595)
Affected Packages:
docker
Issue Correction:
Run dnf update docker --releasever 2023.12.20260608 or dnf update --advisory ALAS2023-2026-1783 --releasever 2023.12.20260608 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
aarch64:
docker-debuginfo-25.0.16-1.amzn2023.0.1.aarch64
docker-25.0.16-1.amzn2023.0.1.aarch64
docker-debugsource-25.0.16-1.amzn2023.0.1.aarch64
src:
docker-25.0.16-1.amzn2023.0.1.src
x86_64:
docker-debuginfo-25.0.16-1.amzn2023.0.1.x86_64
docker-25.0.16-1.amzn2023.0.1.x86_64
docker-debugsource-25.0.16-1.amzn2023.0.1.x86_64