Vulnerability in Tdunning T-Digest
CVE-2026-87822
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.
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: 0.007 (51.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/tdunning/t-digest/issues/229 (issue-tracking)
- github.com/tdunning/t-digest/blob/8d5c1523c3d46925e9b3979a8d63c0b9d004ed1c/core… (technical-description)
- github.com/tdunning/t-digest/blob/8d5c1523c3d46925e9b3979a8d63c0b9d004ed1c/core… (technical-description)
- github.com/tdunning/t-digest (product)
- www.vulncheck.com/advisories/t-digest-3.1-through-3.3-denial-of-service-via-nan… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-87822?
- CVE-2026-87822 is a high-severity vulnerability in Tdunning T-Digest, classified under Inefficient Algorithmic Complexity. CVSS score: 7.5/10. Published 2026-09-09.
- How severe is CVE-2026-87822?
- High severity. CVSS v3 base score is 7.5 out of 10.