CVE-2022-35920: Sanic is an opensource python web server/framework

This week

HIGH 8.3REMOTEUPGRADE

CVE-2022-35920 is a high-severity flaw (CVSS 8.3) affecting sanic. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Sanic is an opensource python web server/framework. Affected versions of sanic allow access to lateral directories when using `app.static` if using encoded `%2F` URLs. Parent directory traversal is not impacted. Users are advised to upgrade. There is no known workaround for this issue.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-22
Published	2022-08-01
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: sanic project

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

Am I affected?

Timeline

2022-08-01 22:15 UTCPublished CVE record published
2026-06-17 04:52 UTCUpdated Record last modified

sanic project sanic UPGRADE

Affected: < 20.12.7 · >= 21.0.0 and < 21.12.2 · >= 22.0.0 and < 22.6.1

Fixed in: 20.12.7, 21.12.2, 22.6.1

Safe to downgrade to: a release before 21.0.0

1. Check installed version

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

2. UPGRADE to 20.12.7 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sanic

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 21.0.0 (Debian / Ubuntu)

apt-cache madison sanic sudo apt install sanic=<VERSION_BEFORE_21.0.0> sudo apt-mark hold sanic

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

dnf --showduplicates list sanic sudo dnf downgrade sanic-<VERSION_BEFORE_21.0.0> sudo dnf versionlock add sanic

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-2022-35920?

sanic: upgrade to 20.12.7, 21.12.2, 22.6.1. Exact commands for each OS are on this page.

Is CVE-2022-35920 being exploited?

CVE-2022-35920 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-2022-35920 affect?

CVE-2022-35920 affects sanic. Severity is high (CVSS 8.3). Sanic is an opensource python web server/framework. Affected versions of sanic allow access to lateral directories when using `app.static` if using encoded `%2F` URLs. Parent directory traversal is not impacted. Users are advised to upgrade

How urgent is CVE-2022-35920?

Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

References

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