Vulnerability · Published Sep 10, 2026 · Assigned by VulnCheck
CVE-2026-87962t-digest 3.1 through 3.3 Denial of Service via Unvalidated Length Fields in MergingDigest.fromBytes
High 7.5
In plain English
A high-severity security flaw in t-digest from tdunning. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.6%top 49.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | t-digest | no fix listed | UBUNTU-CVE-2026-87962 |
| Ubuntu:24.04:LTS | t-digest | no fix listed | UBUNTU-CVE-2026-87962 |
| Ubuntu:26.04:LTS | t-digest | no fix listed | UBUNTU-CVE-2026-87962 |
| Ubuntu:26.10 | t-digest | no fix listed | UBUNTU-CVE-2026-87962 |
Affected products (as reported)
Weakness: CWE-1284 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- GitHub Issue #227 issue-tracking
- MergingDigest.java technical-description
- https://github.com/tdunning/t-digest product
- VulnCheck Advisory: t-digest 3.1 through 3.3 Denial of Service via Unvalidated Length Fields in MergingDigest.fromBytes third-party-advisory