PatchTheCVECVE-2026-26210: KTransformers through 0.5.3 contains an unsafe deserialization vulnerability in the balance_serve backend mode
CVE-2026-26210 is a critical-severity flaw (CVSS 9.8) affecting ktransformers. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
KTransformers through 0.5.3 contains an unsafe deserialization vulnerability 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. Attackers can send a crafted pickle payload to the exposed ZMQ socket to execute arbitrary code on the server with the privileges of the ktransformers process.
Why this priority
- Critical severity
- Public exploit reference
- CISA SSVC: automatable with total technical impact
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.7% (top 47%) |
| CISA exploited list | No |
| Weakness | CWE-502 |
| Published | 2026-04-23 |
| Last modified | 2026-10-26 |
Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Exact fixes by distribution
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- Write-up: chocapikk.com/posts/2026/ktransformers-pickle-rce/
- Write-up: www.vulncheck.com/advisories/ktransformers-unsafe-deserialization-rce-via-balance-serve
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-26210?
ktransformers: upgrade to newer than 0.5.3. Exact commands for each OS are on this page.
Is CVE-2026-26210 being exploited?
CVE-2026-26210 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-26210 affect?
CVE-2026-26210 affects ktransformers. Severity is critical (CVSS 9.8). KTransformers through 0.5.3 contains an unsafe deserialization vulnerability 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 messa
How urgent is CVE-2026-26210?
Priority 61/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action