Vulnerability in Tdunning T-Digest
CVE-2026-87962
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (49.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/tdunning/t-digest/issues/227 (issue-tracking)
- github.com/tdunning/t-digest/blob/7905f3d2ad18e7d7176811147d1316a3e23d7061/core… (technical-description)
- github.com/tdunning/t-digest (product)
- www.vulncheck.com/advisories/t-digest-3.1-through-3.3-denial-of-service-via-unv… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-87962?
- CVE-2026-87962 is a high-severity vulnerability in Tdunning T-Digest, classified under Improper Validation of Specified Quantity in Input. CVSS score: 7.5/10. Published 2026-09-10.
- How severe is CVE-2026-87962?
- High severity. CVSS v3 base score is 7.5 out of 10.