- Exploited
- No known exploitation
- Fix
- Fix or patch referenced
- Who is exposed
- Not reported
Do first: Apply the patch listed under Evidence.
- Last modified
- Whether it needs action now or is a reference record, by fixed rules, with why. Last checked is when cve.now last re-read it.What do these mean? →
- Reference
- Last checked
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 11/100 · provisional
- The rating the maker of the software gives it. Shown when it differs from the CVSS level.What do these mean? →
- Low (apache)
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Apache DataSketches Java, a Java library for sketch data structures, can run out of memory or loop indefinitely when it deserializes a small, crafted sketch image or string from an untrusted source. Applications that load sketches from untrusted sources are affected, and the issue is fixed in version 9.1.0.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
Uncontrolled Resource Consumption vulnerability in the sketch deserialization of Apache DataSketches Java.
Several deserializers trusted sizes and counts declared in the serialized input. A small crafted input could make an application allocate an excessive amount of memory, leading to an OutOfMemoryError. A crafted string passed to FrequentLongsSketch.getInstance(String) could also make deserialization, or a later update, loop indefinitely. Only applications that deserialize sketches from untrusted sources are affected.
This issue affects Apache DataSketches Java: through 9.0.0.
Users are recommended to upgrade to version 9.1.0, which fixes the issue.
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure?/25Unknown. No advisory context yet
- Reach10/20Affects Maven packages
- Severity1/10Rated low by apache
- No patch0/5No signal
What would change the score
- Would score about 66 if added to CISA KEV
- Would score about 61 if CISA's SSVC rates exploitation active
- Would score about 33 if advisories confirm default setups are exposed
What to do
Apply the patch listed under Evidence.
Check your systems with an agent
Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.
Check whether my systems are affected by CVE-2026-122096 (Apache DataSketches Java: Uncontrolled resource consumption when deserializing crafted sketch images), using the cve.now data below.
Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.
What cve.now has for CVE-2026-122096 (entry last updated 2026-11-11):
Affected:
- Maven package org.apache.datasketches:datasketches-java: through 9.0.0
Fixed versions: none listed yet.
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
CISA KEV: CVE-2026-122096 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-122096 only. If you also check another CVE, look up its own KEV status; never assume it from this one.
How to check:
- Packages (Maven): find every lockfile in each project and run the stack.check operation of the cve.now MCP server (execute) on each one. Compare the resolved versions, not the ranges a manifest declares, with the affected versions above. Include transitive dependencies.
Verify against the linked advisories before concluding, and cite the date you read each one:
- https://lists.apache.org/thread/9wd7ngmho7hm8x74sq1p2fp1xgjd8kt6
- https://github.com/apache/datasketches-java/pull/777
- https://github.com/apache/datasketches-java/pull/783
- https://github.com/apache/datasketches-java/releases/tag/9.1.0
- http://www.openwall.com/lists/oss-security/2026/11/10/29
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.
Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.
Entry: https://cve.now/CVE-2026-122096
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-122096"}.Timeline
- CVE published
- First seen by cve.now
- Record last updated
Affected versions
through 9.0.0
Evidence 7
Vendor advisory · 1
Establishes: Affected and fixed versions.
- Advisory
CVE record · 2
Establishes: The identifier and description.
- Record
- Record
Write-ups · 1
Establishes: Technical detail and context.
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-122096
Is CVE-2026-122096 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
Which versions are affected by CVE-2026-122096?
org.apache.datasketches:datasketches-java (Maven): through 9.0.0.Source: cve.now feed data