---
id: CVE-2026-87962
title: >-
  t-digest versions 3.1 through 3.3 contain a denial of service vulnerability in
  MergingDigest.fromBytes that fails to validate length and capacity fields from
  serialized data
summary: >-
  t-digest versions 3.1 through 3.3 contain a denial of service vulnerability in
  MergingDigest.fromBytes that fails to validate length and capacity fields from
  serialized data. Attackers can supply crafted serialized digests with
  mismatche…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-1284
vendor: tdunning
product: t-digest
affected:
  - t-digest >= 3.1 <= 3.3
published: '2026-09-10'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T15:53:23.707'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87962'
references:
  - url: 'https://github.com/tdunning/t-digest'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/tdunning/t-digest/blob/7905f3d2ad18e7d7176811147d1316a3e23d7061/core/src/main/java/com/tdunning/math/stats/MergingDigest.java
    label: disclosure@vulncheck.com
  - url: 'https://github.com/tdunning/t-digest/issues/227'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/t-digest-3.1-through-3.3-denial-of-service-via-unvalidated-length-fields-in-mergingdigest-frombytes
    label: disclosure@vulncheck.com
  - url: 'https://github.com/tdunning/t-digest/issues/227'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-10T12:56:34.629972Z'
ingestedAt: '2026-09-13T23:58:46.941Z'
epss: 0.0063
epssPercentile: 0.48075
---

## Overview

t-digest versions 3.1 through 3.3 contain a denial of service vulnerability in MergingDigest.fromBytes that fails to validate length and capacity fields from serialized data. Attackers can supply crafted serialized digests with mismatched header fields to trigger ArrayIndexOutOfBoundsException or NegativeArraySizeException, aborting the parsing thread.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.