Security Digest · Vulnerability record
CVE-2026-42601: ArchiveBox Vulnerable to RCE via unvalidated per-crawl config overrides in AddView
ArchiveBox is an open source self-hosted web archiving system.
CVSS 9.3 Critical EPSS 0.6% · p48
Should you act?
Critical and remotely reachable
No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- 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.
From the GitHub advisory
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.
When PUBLICADDVIEW=True (common for bookmarklet usage), this is exploitable without authentication. The endpoint is also @csrfexempt.
Affected code:
core/views.py:887 - user config extracted with no validation: customconfig = form.cleaneddata.get("config") or {}
core/views.py:918 - merged into crawl config: config.update(customconfig)
Weakness type: CWE-88.
Product: archivebox (PyPI) · Assigned by: GitHub_M · Published: 2026-05-09
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| PyPI | archivebox | <= 0.8.6rc0 | none listed |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| ArchiveBox | ArchiveBox | <= 0.8.6rc0 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_M | 4.0 | 9.3 Critical | 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 | 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 |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Attack requirements: none
- Privileges required: none (no login)
- User interaction: none
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- 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.
Timeline
- — GitHub-reviewed advisory GHSA-3h23-7824-pj8r published (critical)
- — CVE record published by GitHub_M
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-3h23-7824-pj8r github.com
- CVE.org record CVE-2026-42601 cve.org
- NVD entry CVE-2026-42601 nvd.nist.gov
Other references from the CVE record and advisory
- github.com github.com
- github.com github.com
- pypi.org pypi.org