CVE-2026-48755 is a critical-severity improper input validation vulnerability in github.com/lxc/incus/v7/cmd/incusd (go), affecting versions < 7.2.0. It is fixed in 7.2.0.
Summary Improper validation of user-provided backup compression algorithm leads to argument injection in the constructed command line. This leads to an arbitrary file write on the host, possibly leading to arbitrary command execution. Details Incus validates compression_algorithm by parsing it into fields and checking only the first token against an allowlist: Extra arguments are not rejected. compressFile() then prepends -c and passes the remaining user-supplied fields to the compressor: With a value like: the daemon executes the equivalent of: PoC The following was generated by an LLM model. Impact Improperly validated compression algorithm argument leads to argument injection leading to arbitrary file write with zstd and possibly arbitrary command execution.
The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths. Typical impact: varies by context: data corruption, logic bypass, or denial of service.
CVE-2026-48755 has a CVSS score of 9.9 (Critical). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment.
A fixed version is available (7.2.0). Upgrading removes the vulnerable code path.
go
github.com/lxc/incus/v7/cmd/incusd (< 7.2.0)github.com/lxc/incus/v7/cmd/incusd → 7.2.0 (go)Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter instead of chasing every advisory.
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Already deployed Kodem? See CVE-2026-48755 in your environment →Upgrade github.com/lxc/incus/v7/cmd/incusd to 7.2.0 or later to resolve this vulnerability.
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CVE-2026-48755 is a critical-severity improper input validation vulnerability in github.com/lxc/incus/v7/cmd/incusd (go), affecting versions < 7.2.0. It is fixed in 7.2.0. The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths.
CVE-2026-48755 has a CVSS score of 9.9 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
github.com/lxc/incus/v7/cmd/incusd (go) versions < 7.2.0 is affected.
Yes. CVE-2026-48755 is fixed in 7.2.0. Upgrade to this version or later.
Whether CVE-2026-48755 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
Upgrade github.com/lxc/incus/v7/cmd/incusd to 7.2.0 or later.