CVE-2026-1301

6.8 MEDIUM 0.4% exploit odds No fix listed Memory safety

What it is

In builds with PubSub and JSON enabled, a crafted JSON message can cause the decoder to write beyond a heap-allocated array before authentication, reliably crashing the process and corrupting memory.

At a glance

Exploitability: Can be exploited over the network with a low-privilege account, but needs a user to act. High risk of service disruption.
Exploit odds: 0.4% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2026-02-05 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 10:15 UTC Last updatedMost recent change to the record

Details

Published: 2026-02-05 19:15 UTC
Last modified: 2026-06-17 10:15 UTC
Exploit probability: 0.4% · EPSS, next 30 days
Weakness: CWE-787 · Out-of-bounds write
Record status: Deferred

Attack profile CVSS 4.0 · 6.8

Attack vector: Network
Complexity: Low
Attack requirements: None
Privileges needed: Low
User interaction: Active
Confidentiality: None
Integrity: None
Availability: High

Raw vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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References

https://www.cisa.gov/news-events/ics-advisories/icsa-26-036-03

NVD record · CVE.org record