CVE-2026-56854VulnerabilityPublished 20 Sep 2026Updated 10 Nov 2026

SUSE · Security update for amazon-ssm-agent

Affects SUSESource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-56854· High 7.5

Not known to be exploited · CVSS 7.5 High : upgrade SUSE ssh to 0.55.0 soon.

Data as of 10 Nov 2026, 20:06 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

Patch: Available – fixed in 0.55.0

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade golang.org/x/crypto/ssh to 0.55.0.

Affected software

Product	Affected	Fixed in
golang.org/x/cryptogolang.org/x/crypto/ssh	Affected <0.55.0	Fixed in 0.55.0
Gogolang.org/x/crypto/ssh`pkg:golang/golang.org/x/crypto/ssh`Other threats	Affected <0.55.0	Fixed in 0.55.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

This update for amazon-ssm-agent fixes the following issues: - CVE-2026-56854,CVE-2026-56855,CVE-2026-78662: golang.org/x/crypto/ssh: authentication bypass and deadlocks in the crypto/ssh library (bsc#1278681). - CVE-2026-71556: github.com/go-git/go-git/v5: arbitrary file read/write via symbolic link resolution (bsc#1276981). - CVE-2026-71557: github.com/go-git/go-git/v5: malicious reference names may modify files outside the reference storage (bsc#1276994). Changes for amazon-ssm-agent: - Update to version 3.3.5390.0 * Bump github.com/gorilla/websocket from v1.4.2 to v1.5.3 * Bump golang.org/x/crypto from v0.53.0 to v0.56.0 * Bump golang.org/x/net from v0.56.0 to v0.57.0 * Bump golang.org/x/sys from v0.46.0 to v0.47.0 * Upgrade GoLang version from 1.25 to 1.26 * Mint control-channel token after dial to fix AZ-fault token expiry * Resume patch documents interrupted by an external shutdown * Use systemctl for systemd in aws: configureDocker on Amazon Linux * Update greengrass component version to 1.3.5 - Update to version 3.3.5226.0 * Add bounds check for HeaderLength in AgentMessage Deserialize * Bump github.com/go-git/go-git/v5 to v5.19.2 * Bump golang.org/x/sync to v0.21.0 * Detect Azure Linux and potential future unregistered Linux platforms * Fix Windows session command parsing by removing shlex * Fix shell injection in Windows domainjoin plugin parameters * Prevent control channel deadlock on ProcessorBufferFull * Revert migration from aws-sdk-go v1 to aws-sdk-go-v2 change * Update the logic for loading RegistrationInfo * Upgrade Go version to 1.25.13 - Update to version 3.3.5068.0 * Migrate from aws-sdk-go v1 to aws-sdk-go-v2 * Fix flaky registration/connection channel tests * Sync AWS SDK fork in extra/ with multicloud vendor changes * Harden function create file with permissions in a single syscall * Upgrade Go version to 1.25.12 * Bump golang.org/x/net@v0.55.0 to golang.org/x/net@v0.56.0 * Fix loopback bypass in remote-host port forwarding denylist - Update to version 3.3.4851.0 * Add ECS/EKS credential endpoints and loopback to port-forward denylist * Canonicalize IP addresses before port-forwarding denylist check * Pass the ActiveDirectory domain password via stdin using -y /dev/stdin instead of the -w flag * Fix false StuckAtInProgress timeout for associations with rate >= 2h * Fix non-interactive session big file transfer issues * Prevent ssm-user race condition with flock-based serialization * Send AWS::EC2::Instance as source type when registered with provider EC2 * Validate process name in orphan worker detection - Update to version 3.3.4793.0 * Add multicloud support enabling SSM Agent registration with Azure cloud providers * Add support for the upcoming public key in the agent code

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