CVE-2026-41645: Nuclei is a vulnerability scanner built on a simple YAML-based DSL

Routine

MEDIUM 5.3UPGRADE

CVE-2026-41645 is a medium-severity flaw (CVSS 5.3) affecting nuclei. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Nuclei is a vulnerability scanner built on a simple YAML-based DSL. From version 3.0.0 to before version 3.8.0, a vulnerability in Nuclei's expression evaluation engine makes it possible for a malicious target server to inject and execute supported DSL expressions. This happens when HTTP response data containing helper/function syntax gets reused by multi-step templates. If the -env-vars / -ev option is explicitly enabled, this can expose host en

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-94
Published	2026-05-08
Last modified	2026-10-26

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

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

Am I affected?

Timeline

2026-05-08 04:16 UTCPublished CVE record published
2026-10-26 20:10 UTCUpdated Record last modified

projectdiscovery nuclei UPGRADE

Affected: >= 3.0.0 and < 3.8.0

Fixed in: 3.8.0

Safe to downgrade to: a release before 3.0.0

1. Check installed version

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

2. UPGRADE to 3.8.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nuclei

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.0.0 (Debian / Ubuntu)

apt-cache madison nuclei sudo apt install nuclei=<VERSION_BEFORE_3.0.0> sudo apt-mark hold nuclei

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list nuclei sudo dnf downgrade nuclei-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add nuclei

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.

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-2026-41645?

nuclei: upgrade to 3.8.0. Exact commands for each OS are on this page.

Is CVE-2026-41645 being exploited?

CVE-2026-41645 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-2026-41645 affect?

CVE-2026-41645 affects nuclei. Severity is medium (CVSS 5.3). Nuclei is a vulnerability scanner built on a simple YAML-based DSL. From version 3.0.0 to before version 3.8.0, a vulnerability in Nuclei's expression evaluation engine makes it possible for a malicious target server to inject and execute s

How urgent is CVE-2026-41645?

Priority 26/100. No elevated risk signals yet.

Related CVEs

CVE-2026-41282 MEDIUM 4.0 UPGRADE ProjectDiscovery Nuclei 3 before 3.8.0 allows DSL expression injection
CVE-2026-41646 MEDIUM 5.5 UPGRADE Nuclei is a vulnerability scanner built on a simple YAML-based DSL

References

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