CVE-2026-77082: n8n before 1.123.69, 2.x before 2.33.4, and 2.34.x before 2.34.1 contains a regular expression denial of servi

Q: How do I fix CVE-2026-77082?

n8n: upgrade to 1.123.69, 2.33.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-77082 being exploited?

CVE-2026-77082 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-2026-77082 affect?

CVE-2026-77082 affects n8n. Severity is medium (CVSS 4.3). n8n before 1.123.69, 2.x before 2.33.4, and 2.34.x before 2.34.1 contains a regular expression denial of service (ReDoS) vulnerability in the Filter and Switch nodes, which compile user-supplied regex patterns with new RegExp() and execute

Q: How urgent is CVE-2026-77082?

Priority 25/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2026-77082 is a medium-severity flaw (CVSS 4.3) affecting n8n. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

n8n before 1.123.69, 2.x before 2.33.4, and 2.34.x before 2.34.1 contains a regular expression denial of service (ReDoS) vulnerability in the Filter and Switch nodes, which compile user-supplied regex patterns with new RegExp() and execute them synchronously on the worker thread without complexity validation or execution timeout. A crafted regex pattern can block the worker for an extended period per data item processed, delaying other workflow e

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (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-1333
Published	2026-08-20
Last modified	2026-09-01

Publisher (CNA): VulnCheck · Vendor: n8n

Last updated 2026-09-01 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-20 12:16 UTCPublished CVE record published
2026-09-01 19:47 UTCUpdated Record last modified

n8n n8n UPGRADE

Affected: < 1.123.69 · >= 2.0.0 and < 2.33.4 · 2.34.0

Fixed in: 1.123.69, 2.33.4

Safe to downgrade to: a release before 2.0.0

1. Check installed version

npm ls n8n

2. UPGRADE to 1.123.69

npm install n8n@">=1.123.69"

3. If no update is available yet, DOWNGRADE to a release before 2.0.0

npm view n8n versions npm install n8n@"<2.0.0"

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-2026-77082?

n8n: upgrade to 1.123.69, 2.33.4. Exact commands for each OS are on this page.

Is CVE-2026-77082 being exploited?

CVE-2026-77082 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-2026-77082 affect?

CVE-2026-77082 affects n8n. Severity is medium (CVSS 4.3). n8n before 1.123.69, 2.x before 2.33.4, and 2.34.x before 2.34.1 contains a regular expression denial of service (ReDoS) vulnerability in the Filter and Switch nodes, which compile user-supplied regex patterns with new RegExp() and execute

How urgent is CVE-2026-77082?

Priority 25/100. No elevated risk signals yet.

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References

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