---
title: "CVE-2026-104016: ProtobufParser - Integer Overflow"
description: "ProtobufParser contains an integer overflow in length-prefixed string and bytes field parsing, caused by 32-bit signed arithmetic overflow in length calculation, letting attackers cause denial of service via OutOfMemoryError, exploit requires ability to submit crafted data for parsing."
url: https://panop.io/threat-heartbeat/CVE-2026-104016/
---

# CVE-2026-104016 ProtobufParser - Integer Overflow

ProtobufParser contains an integer overflow in length-prefixed string and bytes field parsing, caused by 32-bit signed arithmetic overflow in length calculation, letting attackers cause denial of service via OutOfMemoryError, exploit requires ability to submit crafted data for parsing.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.68% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-104016)

## Details

Type

Integer Overflow

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

28 October 2026

Updated

29 October 2026

Weakness

[CWE-190](https://cwe.mitre.org/data/definitions/190.html)

## Vendor fix

Update to a version including the February 2026 hardening commit that adds overflow guards to string-length parsing.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-104016](https://nvd.nist.gov/vuln/detail/CVE-2026-104016)
- [https://github.com/FasterXML/jackson-dataformats-binary/security/advisories/GHSA-c2rq-mcfv-jw29](https://github.com/FasterXML/jackson-dataformats-binary/security/advisories/GHSA-c2rq-mcfv-jw29)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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