CVE-2026-34715: ewe is a Gleam web server

Q: How do I fix CVE-2026-34715?

ewe: upgrade to 3.0.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-34715 being exploited?

CVE-2026-34715 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-2026-34715 affect?

CVE-2026-34715 affects ewe. Severity is medium (CVSS 5.3). ewe is a Gleam web server. Prior to version 3.0.6, the encode_headers function in src/ewe/internal/encoder.gleam directly interpolates response header keys and values into raw HTTP bytes without validating or stripping CRLF (\r\n) sequences

Q: How urgent is CVE-2026-34715?

Priority 35/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-34715 is a medium-severity flaw (CVSS 5.3) 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. Prior to version 3.0.6, the encode_headers function in src/ewe/internal/encoder.gleam directly interpolates response header keys and values into raw HTTP bytes without validating or stripping CRLF (\r\n) sequences. An application that passes user-controlled data into response headers (e.g., setting a Location redirect header from a request parameter) allows an attacker to inject arbitrary HTTP response content, leading

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-113
Published	2026-04-02
Last modified	2026-07-24

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

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-02 18:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

vshakitskiy ewe UPGRADE

Affected: < 3.0.6

Fixed in: 3.0.6

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.0.6 (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.

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-2026-34715?

ewe: upgrade to 3.0.6. Exact commands for each OS are on this page.

Is CVE-2026-34715 being exploited?

CVE-2026-34715 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-2026-34715 affect?

CVE-2026-34715 affects ewe. Severity is medium (CVSS 5.3). ewe is a Gleam web server. Prior to version 3.0.6, the encode_headers function in src/ewe/internal/encoder.gleam directly interpolates response header keys and values into raw HTTP bytes without validating or stripping CRLF (\r\n) sequences

How urgent is CVE-2026-34715?

Priority 35/100. Public exploit reference; Remotely exploitable, no login, no user action

References

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