CVE-2026-26015: DocsGPT is a GPT-powered chat for documentation

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2026-26015 is a critical-severity flaw (CVSS 9.8) affecting docsgpt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

DocsGPT is a GPT-powered chat for documentation. From version 0.15.0 to before version 0.16.0, an attacker accessing both the official DocsGPT website or any local and public deployment, can craft a malicious payload bypassing the "MCP test" behavior to achieve arbitrary remote code execution (RCE). This issue has been patched in version 0.16.0.

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 33%)
CISA exploited list	No
Weakness	CWE-77
Published	2026-04-29
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: arc53

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-29 18:16 UTCPublished CVE record published
2026-10-26 20:10 UTCUpdated Record last modified

arc53 docsgpt DOWNGRADE

Affected: 0.15.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.15.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.15.0 (Debian / Ubuntu)

apt-cache madison docsgpt sudo apt install docsgpt=<VERSION_BEFORE_0.15.0> sudo apt-mark hold docsgpt

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list docsgpt sudo dnf downgrade docsgpt-<VERSION_BEFORE_0.15.0> sudo dnf versionlock add docsgpt

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · ddnet · FIXED · 20.2-1.fc46 · FEDORA-2026-6991b4ab14 · source

sudo dnf upgrade --advisory=FEDORA-2026-6991b4ab14

Fedora ELN · libplacebo · FIXED · 7.360.1-5.eln159 · FEDORA-2026-92226f221e · source

sudo dnf upgrade --advisory=FEDORA-2026-92226f221e

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/arc53/DocsGPT/security/advisories/GHSA-gcrq-f296-2j74

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-2026-26015?

docsgpt: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-26015 being exploited?

CVE-2026-26015 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-2026-26015 affect?

CVE-2026-26015 affects docsgpt. Severity is critical (CVSS 9.8). DocsGPT is a GPT-powered chat for documentation. From version 0.15.0 to before version 0.16.0, an attacker accessing both the official DocsGPT website or any local and public deployment, can craft a malicious payload bypassing the "MCP test

How urgent is CVE-2026-26015?

Priority 64/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

References

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