CVE-2026-1301
CVE-2026-1301 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.
Key facts
- Severity: Medium (CVSS 4.0 base score 6.8)
- EPSS exploit prediction: 0% (26th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-5530
- Weakness: CWE-787
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2026-1301?
- 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.
- How severe is CVE-2026-1301?
- CVE-2026-1301 has a CVSS 4.0 base score of 6.8, rated medium severity.
- Is CVE-2026-1301 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-1301?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-1301 have an EU (EUVD) identifier?
- Yes. CVE-2026-1301 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5530.
- When was CVE-2026-1301 published?
- CVE-2026-1301 was published on 2026-02-05 and last updated on 2026-06-17.
References
Other CWE-787 (Out-of-bounds Write) vulnerabilities
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