What’s Vulnerable › Vulnerabilities

CVE-2026-87962: t-digest 3.1 through 3.3 Denial of Service via Unvalidated Length Fields in MergingDigest.fromBytes

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-10 · updated 2026-09-10
• Weakness: CWE-1284

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 products

• tdunning t-digest: from 3.1 through 3.3

References

• https://github.com/tdunning/t-digest
• https://github.com/tdunning/t-digest/blob/7905f3d2ad18e7d7176811147d1316a3e23d7061/core/src/main/java/com/tdunning/math/stats/MergingDigest.java
• https://github.com/tdunning/t-digest/issues/227
• https://www.vulncheck.com/advisories/t-digest-3.1-through-3.3-denial-of-service-via-unvalidated-length-fields-in-mergingdigest-frombytes
• https://github.com/tdunning/t-digest/issues/227

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