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SCA: security update for org.http4s:blaze-http_2.12, org.http4s:blaze-http_2.13, org.http4s:blaze-http_3 (GHSA-46q4-43ph-c6fr)

high Tenable Self-Hosted Container Security Plugin ID 445919

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - blaze is a Scala library for building asynchronous pipelines, with a focus on network IO. Prior to 0.23.18
 and 1.0.0-M42, blaze-server can merge HTTP/1.1 chunked-body trailer fields into Request.headers. Because
 trailer fields are attacker-controlled, an unauthenticated remote client can inject arbitrary header names
 and values, including X-Forwarded-For and internal authorization headers, that a fronting proxy sanitized
 from the request-header section, bypassing header-based trust decisions in the application. Any http4s
 application using BlazeServerBuilder over HTTP/1.1 whose routes or middleware trust proxy-set headers,
 including X-Forwarded-For, X-Real-IP, and X-Forwarded-Host, is affected. If a fronting proxy strips or
 normalizes those headers but forwards chunked bodies with trailers intact, an attacker can spoof client IP
 for allow-lists, rate limits, or auditing, forge the https scheme, or inject internal authorization
 headers. A promoted Connection: close trailer is also honored, allowing attacker-controlled termination of
 pooled backend connections. This issue is fixed in versions 0.23.18 and 1.0.0-M42. (CVE-2026-73495)

Solution

Update the org.http4s:blaze-http_2.12 library and its related packages to version 0.23.18 or later.

See Also

https://github.com/advisories/GHSA-46q4-43ph-c6fr

Plugin Details

Severity: High

ID: 445919

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 8/13/2026

Updated: 8/13/2026

Risk Information

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.3

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:N

CVSS Score Source: CVE-2026-73495

CVSS v3

Risk Factor: High

Base Score: 7.4

Temporal Score: 6.4

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 7/24/2026

Vulnerability Publication Date: 7/24/2026

Reference Information

CVE: CVE-2026-73495

cwe: CWE-444