CVE-2024-49768: Waitress is a Web Server Gateway Interface server for Python 2 and 3

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2024-49768 is a critical-severity flaw (CVSS 9.1) affecting waitress. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Waitress is a Web Server Gateway Interface server for Python 2 and 3. A remote client may send a request that is exactly recv_bytes (defaults to 8192) long, followed by a secondary request using HTTP pipelining. When request lookahead is disabled (default) we won't read any more requests, and when the first request fails due to a parsing error, we simply close the connection. However when request lookahead is enabled, it is possible to process an

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-367, CWE-444
Published	2024-10-29
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2024-10-29 15:15 UTCPublished CVE record published
2026-06-17 08:00 UTCUpdated Record last modified

agendaless waitress UPGRADE

Affected: >= 2.0.0 and < 3.0.1

Fixed in: 3.0.1

Safe to downgrade to: a release before 2.0.0

1. Check installed version

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

2. UPGRADE to 3.0.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade waitress

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 2.0.0 (Debian / Ubuntu)

apt-cache madison waitress sudo apt install waitress=<VERSION_BEFORE_2.0.0> sudo apt-mark hold waitress

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

dnf --showduplicates list waitress sudo dnf downgrade waitress-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add waitress

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-2024-49768?

waitress: upgrade to 3.0.1. Exact commands for each OS are on this page.

Is CVE-2024-49768 being exploited?

CVE-2024-49768 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-2024-49768 affect?

CVE-2024-49768 affects waitress. Severity is critical (CVSS 9.1). Waitress is a Web Server Gateway Interface server for Python 2 and 3. A remote client may send a request that is exactly recv_bytes (defaults to 8192) long, followed by a secondary request using HTTP pipelining. When request lookahead is di

How urgent is CVE-2024-49768?

Priority 47/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

Related CVEs

CVE-2024-49769 HIGH 7.5 UPGRADE Waitress is a Web Server Gateway Interface server for Python 2 and 3

References

← Back to latest CVEs