CVE-2026-87962

t-digest 3.1 through 3.3 Denial of Service via Unvalidated Length Fields in MergingDigest.fromBytes

8.7 High

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.63%Up 0.2 points since Sep 11, 2026

What each source reports

CVE List Score used 8.7

t-digest 3.1 through 3.3 Denial of Service via Unvalidated Length Fields in MergingDigest.fromBytes

Record: CVE-2026-87962
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-1284
Updated: 2026-11-02

EUVDEUVD-2026-75387 8.7

Record: EUVD-2026-75387
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-p7mw-7cfx-cr67 8.7

t-digest versions 3.1 through 3.3 contain a denial of service vulnerability in MergingDigest...

Record: GHSA-p7mw-7cfx-cr67
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-1284
Updated: 2026-11-02

NVD 8.7

Record: CVE-2026-87962
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-1284
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-87962 8.7

Record: UBUNTU-CVE-2026-87962
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

tdunning t-digest

Affected packages

Affected packages
Package	Affected	Fixed
`t-digest` Ubuntu:16.04:LTS	All versions, plus listed versions 1:3.0-1build1	None known
`t-digest` Ubuntu:18.04:LTS	All versions, plus listed versions 1:3.0-1build1	None known
`t-digest` Ubuntu:20.04:LTS	All versions, plus listed versions 1:3.0-3	None known
`t-digest` Ubuntu:22.04:LTS	All versions, plus listed versions 1:3.0-3	None known
`t-digest` Ubuntu:24.04:LTS	All versions, plus listed versions 1:3.0-3	None known
`t-digest` Ubuntu:26.10	All versions, plus listed versions 1:3.0-3build1	None known
`t-digest` Ubuntu:26.04:LTS	All versions, plus listed versions 1:3.0-31:3.0-3build1	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-87962 is a high vulnerability (CVSS 8.7) in Tdunning T-digest, published September 10, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.63%, the 50th percentile. No source names a fixed version.