CVE-2026-34715

MEDIUM EPSS 24.5%
Published Apr 2, 20263mo ago · Modified Jun 17, 20262w ago
5.3 CVSS 3.1
Medium
Find Similar
Published Apr 2, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

Description

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 to response splitting, cache poisoning, and possible cross-site scripting. Notably, ewe does validate CRLF in incoming request headers via validate_field_value() in the HTTP/1.1 parser — but provides no equivalent protection for outgoing response headers in the encoder. This issue has been patched in version 3.0.6.

CVSS Details

Base Score
5.3
Exploitability
3.9
Impact
1.4
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
24.5% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-113

Affected Products 1

VendorProductVersionRange
vshakitskiyewe* <3.0.6

References 3

  • github.com https://github.com/vshakitskiy/ewe/commit/ce4ff214d32626a10fda9398dc94a2d720e17446
    Patch
  • github.com https://github.com/vshakitskiy/ewe/releases/tag/v3.0.6
    ProductRelease Notes
  • github.com https://github.com/vshakitskiy/ewe/security/advisories/GHSA-x2w3-23jr-hrpf
    ExploitVendor Advisory

Remediation

  • github.com https://github.com/vshakitskiy/ewe/commit/ce4ff214d32626a10fda9398dc94a2d720e17446
    Patch