Summary
Workarounds
On S3 backends, configure
# ...
blockstore:
s3:
disable_pre_signed_multipart: true
or set environment variable LAKEFS_BLOCKSTORE_S3_DISABLE_PRE_SIGNED_MULTIPART to true.
References
Are there any links users can visit to find out more?
Impact
An authenticated user can crash lakeFS by exhausting server memory. This is an authenticated denial-of-service issue.
Crafted input forces the application to consume excessive CPU, memory, or other resources, degrading or denying service. Typical impact: denial of service.
CVE-2025-27100 has a CVSS score of 6.5 (Medium). 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 (1.50.0); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
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. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
This problem has been patched and exists in versions 1.49.1 and below
Frequently Asked Questions
- What is CVE-2025-27100? CVE-2025-27100 is a medium-severity uncontrolled resource consumption vulnerability in github.com/treeverse/lakefs (go), affecting versions < 1.50.0. It is fixed in 1.50.0. Crafted input forces the application to consume excessive CPU, memory, or other resources, degrading or denying service.
- How severe is CVE-2025-27100? CVE-2025-27100 has a CVSS score of 6.5 (Medium). 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.
- Which versions of github.com/treeverse/lakefs are affected by CVE-2025-27100? github.com/treeverse/lakefs (go) versions < 1.50.0 is affected.
- Is there a fix for CVE-2025-27100? Yes. CVE-2025-27100 is fixed in 1.50.0. Upgrade to this version or later.
- Is CVE-2025-27100 exploitable, and should I be worried? Whether CVE-2025-27100 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
- What actually determines whether CVE-2025-27100 is exploitable, and how bad it is? 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.
- How do I fix CVE-2025-27100? Upgrade
github.com/treeverse/lakefsto 1.50.0 or later.