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CVE-2026-26210 kvcache-ai CVE debrief

CVE-2026-26210 is a critical vulnerability in KTransformers, a software package developed by Kvcache Ai. The vulnerability is caused by an unsafe deserialization issue in the balance_serve backend mode, where the scheduler RPC server binds a ZMQ ROUTER socket to all interfaces with no authentication and deserializes incoming messages using pickle.loads() without validation. This allows attackers to send a crafted pickle payload to the exposed ZMQ socket to execute arbitrary code on the server with the privileges of the ktransformers process. Users of KTransformers should be aware of this vulnerability and take immediate action to mitigate the risk.

Vendor
kvcache-ai
Product
ktransformers
CVSS
CRITICAL 9.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-23
Original CVE updated
2026-07-14
Advisory published
2026-04-23
Advisory updated
2026-07-14

Who should care

Users of KTransformers, particularly those using version 0.5.3 or earlier, should be aware of this vulnerability and take immediate action to mitigate the risk. This includes updating to a patched version, restricting access to the ZMQ socket, and implementing additional security measures to prevent exploitation. Operators, platform administrators, vulnerability management teams, and security teams should review the vulnerability and take necessary actions.

Technical summary

The vulnerability is caused by the use of pickle.loads() without validation in the balance_serve backend mode of KTransformers. This allows attackers to send a crafted pickle payload to the exposed ZMQ socket to execute arbitrary code on the server with the privileges of the ktransformers process. The CVSS score for this vulnerability is 9.3, indicating a critical severity. Affected product deployments should be reviewed for exposure.

Defensive priority

High

Recommended defensive actions

  • Update KTransformers to a patched version
  • Restrict access to the ZMQ socket
  • Implement additional security measures to prevent exploitation
  • Monitor for suspicious activity
  • Inventory and audit KTransformers installations
  • Review compensating controls for exposed systems
  • Track exceptions and retest remediated assets

Evidence notes

The CVE record was published on 2026-04-23T22:16:26.400Z and was last modified on 2026-07-14T16:16:57.713Z. The NVD entry is currently Analyzed. The vulnerability is tracked under CWE-502. Evidence is limited to CVE and NVD information. Defenders should verify KTransformers version and configuration.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-26210 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-26210

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-26210 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-26210

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.