CVE-2026-33981: changedetection.io is a free open source web page change detection tool

Q: How do I fix CVE-2026-33981?

changedetection: upgrade to 0.54.7. Exact commands for each OS are on this page.

Q: Is CVE-2026-33981 being exploited?

CVE-2026-33981 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-2026-33981 affect?

CVE-2026-33981 affects changedetection. Severity is medium (CVSS 6.5). changedetection.io is a free open source web page change detection tool. Prior to 0.54.7, the `jq:` and `jqraw:` include filter expressions allow use of the jq `env` builtin, which reads all process environment variables and stores them as

Q: How urgent is CVE-2026-33981?

Priority 38/100. Public exploit reference

Routine

MEDIUM 6.5UPGRADE

CVE-2026-33981 is a medium-severity flaw (CVSS 6.5) affecting changedetection. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

changedetection.io is a free open source web page change detection tool. Prior to 0.54.7, the `jq:` and `jqraw:` include filter expressions allow use of the jq `env` builtin, which reads all process environment variables and stores them as the watch snapshot. An authenticated user (or unauthenticated user when no password is set, the default) can leak sensitive environment variables including `SALTED_PASS`, `PLAYWRIGHT_DRIVER_URL`, `HTTP_PROXY`,

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-200
Published	2026-03-27
Last modified	2026-10-26

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

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

Am I affected?

Timeline

2026-03-27 22:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

webtechnologies changedetection UPGRADE

Affected: < 0.54.7

Fixed in: 0.54.7

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.54.7 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade changedetection

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-2026-33981?

changedetection: upgrade to 0.54.7. Exact commands for each OS are on this page.

Is CVE-2026-33981 being exploited?

CVE-2026-33981 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-2026-33981 affect?

CVE-2026-33981 affects changedetection. Severity is medium (CVSS 6.5). changedetection.io is a free open source web page change detection tool. Prior to 0.54.7, the `jq:` and `jqraw:` include filter expressions allow use of the jq `env` builtin, which reads all process environment variables and stores them as

How urgent is CVE-2026-33981?

Priority 38/100. Public exploit reference

Related CVEs

CVE-2026-35490 CRITICAL 9.8 UPGRADE changedetection.io is a free open source web page change detection tool
CVE-2026-43891 HIGH 7.5 UPGRADE changedetection.io is a free open source web page change detection tool
CVE-2026-41895 HIGH 7.5 UPGRADE changedetection.io is a free open source web page change detection tool
CVE-2026-35000 MEDIUM 6.5 UPGRADE ChangeDetection.io versions prior to 0.54.7 contain a protection bypass vulnerability in the SafeXPath3Parser

References

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