---
title: "CVE-2026-42601: ArchiveBox Vulnerable to RCE via unvalidated per-crawl config overrides in AddView"
url: https://erroneo.us/security/cve/CVE-2026-42601/
description: "CVE-2026-42601 (archivebox (PyPI)): ArchiveBox is an open source self-hosted web archiving system. In versions 0.8.6rc0 and prior, the /add/ endpoint…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-09
date_modified: 2026-07-07
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-42601"
kev: false
cvss: 9.3
epss: 0.00596
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-42601: ArchiveBox Vulnerable to RCE via unvalidated per-crawl config overrides in AddView

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.6% , percentile 48: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 48% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes archivebox (PyPI) <= 0.8.6rc0, no fixed version listed . Check your lockfile, including transitive dependencies.

## What it is

ArchiveBox is an open source self-hosted web archiving system. In versions 0.8.6rc0 and prior, the /add/ endpoint (AddView in core/views.py) accepts a config JSON field that gets merged into the crawl config without validation. This config is exported as environment variables when archive plugins run, allowing injection of arbitrary tool arguments to achieve RCE. At time of publication, there are no publicly available patches.

## Affected packages

- PyPI `archivebox` <= 0.8.6rc0 → fixed: none listed

## Affected products (CVE record)

- ArchiveBox ArchiveBox: <= 0.8.6rc0

## Severity

- GitHub_M CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`
- GitHub CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.60% probability of exploitation activity in the next 30 days; percentile 48.

## Sources

- [GitHub Advisory GHSA-3h23-7824-pj8r](https://github.com/advisories/GHSA-3h23-7824-pj8r)
- [CVE.org record CVE-2026-42601](https://www.cve.org/CVERecord?id=CVE-2026-42601)
- [NVD entry CVE-2026-42601](https://nvd.nist.gov/vuln/detail/CVE-2026-42601)
- [github.com](https://github.com/ArchiveBox/ArchiveBox/security/advisories/GHSA-3h23-7824-pj8r)
- [github.com](https://github.com/pypa/advisory-database/tree/main/vulns/archivebox/PYSEC-2026-283.yaml)
- [pypi.org](https://pypi.org/project/archivebox)

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Source page: https://erroneo.us/security/cve/CVE-2026-42601/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt