Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The Maven package io.github.ndsev:zserio-runtime, versions before 2.18.1, is vulnerable to unbounded memory allocation during deserialization. A crafted payload of only a few bytes can trigger allocations of up to about 16 GB, which can crash the process with an out-of-memory error. Upgrade to version 2.18.1 or later. The source gives few details on the exact conditions required for an attacker to supply such a payload.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.5 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0032, the 25th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:20 UTC First seen by agentprime
- 31 Oct 2026, 14:20 UTC Confirmed by OSV