CVE-2020-26213: In teler before version 0.0.1, if you run teler inside a Docker container and encounter `errors.Exit` function

Q: How do I fix CVE-2020-26213?

teler: upgrade to 0.0.1. Exact commands for each OS are on this page.

Q: Is CVE-2020-26213 being exploited?

CVE-2020-26213 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-26213 affect?

CVE-2020-26213 affects teler. Severity is medium (CVSS 5.9). 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. T

Q: How urgent is CVE-2020-26213?

Priority 49/100. Remotely exploitable, no login, no user action; On your watchlist

This month

MEDIUM 5.9REMOTEWATCHLISTUPGRADE

CVE-2020-26213 is a medium-severity flaw (CVSS 5.9) affecting teler. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Weakness	CWE-476
Published	2020-11-06
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: teler project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-11-06 17:15 UTCPublished CVE record published
2026-06-17 03:07 UTCUpdated Record last modified

teler project teler UPGRADE

Affected: < 0.0.1

Fixed in: 0.0.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy teler || rpm -q teler || teler --version

2. UPGRADE to 0.0.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade teler

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade teler

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-26213?

teler: upgrade to 0.0.1. Exact commands for each OS are on this page.

Is CVE-2020-26213 being exploited?

CVE-2020-26213 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-26213 affect?

CVE-2020-26213 affects teler. Severity is medium (CVSS 5.9). 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. T

How urgent is CVE-2020-26213?

Priority 49/100. Remotely exploitable, no login, no user action; On your watchlist

Software pages

Docker vulnerabilities

Related CVEs

CVE-2022-23466 MEDIUM 5.4 DOWNGRADE teler is an real-time intrusion detection and threat alert dashboard

References

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