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CVE-2026-87822— t-digest 3.1 through 3.3 Denial of Service via NaN Centroid Means in MergingDigest.fromBytes

Quick assessment

Affected
tdunning t-digest
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

t-digest 3.1 至 3.3 版本在 反序列化过程中未能正确校验质心均值（centroid means），使得攻击者能够注入 NaN 值以绕过校验逻辑。攻击者可构造包含 NaN 质心的恶意序列化数据，从而将排序性能从 O(n log n) 降级至 O(n²)，导致在执行合并（merge）操作时出现严重的处理延迟。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-87822

Vulnerability Information
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Vulnerability Title
t-digest 3.1 through 3.3 Denial of Service via NaN Centroid Means in MergingDigest.fromBytes
Source: CVE Program / CVE List V5
Vulnerability Description
t-digest versions 3.1 through 3.3 fail to validate centroid means during deserialization in MergingDigest.fromBytes, allowing attackers to inject NaN values that bypass validation checks. Attackers can craft malicious serialized digests containing NaN centroids that degrade sorting performance from O(n log n) to O(n squared), causing severe processing delays during merge operations.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
tdunning t-digest 3.1 ~ 3.3 -

II. Public POCs for CVE-2026-87822

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-87822

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Vendor Advisories for CVE-2026-87822 (1)

Proof of Concept for CVE-2026-87822 (1)

Other References for CVE-2026-87822 (1)

IV. Related Vulnerabilities

Same weakness: CWE-407

V. Comments for CVE-2026-87822

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