CVE-2022-30503: Nginx NJS v0.7.2 was discovered to contain a segmentation violation in the function njs_set_number at src/njs_

Routine

MEDIUM 5.5WATCHLISTDOWNGRADE

CVE-2022-30503 is a medium-severity flaw (CVSS 5.5) affecting njs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Nginx NJS v0.7.2 was discovered to contain a segmentation violation in the function njs_set_number at src/njs_value.h.

Why this priority

On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Published	2022-06-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nginx

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-06-02 14:15 UTCPublished CVE record published
2026-06-17 04:43 UTCUpdated Record last modified

nginx njs DOWNGRADE

Affected: 0.7.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.7.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.7.2 (Debian / Ubuntu)

apt-cache madison njs sudo apt install njs=<VERSION_BEFORE_0.7.2> sudo apt-mark hold njs

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list njs sudo dnf downgrade njs-<VERSION_BEFORE_0.7.2> sudo dnf versionlock add njs

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-2022-30503?

njs: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-30503 being exploited?

CVE-2022-30503 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-2022-30503 affect?

CVE-2022-30503 affects njs. Severity is medium (CVSS 5.5). Nginx NJS v0.7.2 was discovered to contain a segmentation violation in the function njs_set_number at src/njs_value.h.

How urgent is CVE-2022-30503?

Priority 30/100. On your watchlist

Software pages

nginx vulnerabilities

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References

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