CVE-2026-32873: ewe is a Gleam web server

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HIGH 7.5REMOTEUPGRADE

CVE-2026-32873 is a high-severity flaw (CVSS 7.5) affecting ewe. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ewe is a Gleam web server. Versions 0.8.0 through 3.0.4 contain a bug in the handle_trailers function where rejected trailer headers (forbidden or undeclared) cause an infinite loop. When handle_trailers encounters such a trailer, three code paths (lines 520, 523, 526) recurse with the original buffer (rest) instead of advancing past the rejected header (Buffer(header_rest, 0)), causing decoder.decode_packet to re-parse the same header on every i

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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-825, CWE-835
Published	2026-03-20
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2026-03-20 02:16 UTCPublished CVE record published
2026-06-17 10:36 UTCUpdated Record last modified

vshakitskiy ewe UPGRADE

Affected: >= 0.8.0 and < 3.0.5

Fixed in: 3.0.5

Safe to downgrade to: a release before 0.8.0

1. Check installed version

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

2. UPGRADE to 3.0.5 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ewe

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 0.8.0 (Debian / Ubuntu)

apt-cache madison ewe sudo apt install ewe=<VERSION_BEFORE_0.8.0> sudo apt-mark hold ewe

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

dnf --showduplicates list ewe sudo dnf downgrade ewe-<VERSION_BEFORE_0.8.0> sudo dnf versionlock add ewe

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-2026-32873?

ewe: upgrade to 3.0.5. Exact commands for each OS are on this page.

Is CVE-2026-32873 being exploited?

CVE-2026-32873 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-2026-32873 affect?

CVE-2026-32873 affects ewe. Severity is high (CVSS 7.5). ewe is a Gleam web server. Versions 0.8.0 through 3.0.4 contain a bug in the handle_trailers function where rejected trailer headers (forbidden or undeclared) cause an infinite loop. When handle_trailers encounters such a trailer, three cod

How urgent is CVE-2026-32873?

Priority 48/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-34715 MEDIUM 5.3 UPGRADE ewe is a Gleam web server
CVE-2026-32881 MEDIUM 5.3 UPGRADE ewe is a Gleam web server

References

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