CVE-2026-73495: blaze is a Scala library for building asynchronous pipelines, with a focus on network IO

Q: How do I fix CVE-2026-73495?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Q: Is CVE-2026-73495 being exploited?

CVE-2026-73495 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-2026-73495 affect?

CVE-2026-73495 affects affected software. Severity is high (CVSS 7.4). 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-

Q: How urgent is CVE-2026-73495?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.4REMOTE

CVE-2026-73495 is a high-severity flaw (CVSS 7.4) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 s

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.4 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-444
Published	2026-08-12
Last modified	2026-10-24

Publisher (CNA): GitHub, Inc.

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-08-12 22:17 UTCPublished CVE record published
2026-10-24 15:10 UTCUpdated Record last modified

Exact fixes by distribution

Maven · org.http4s:blaze-http_2.13 · FIXED · 0.23.18 · vulnerable: <= 0.23.17 · source

Set org.http4s:blaze-http_2.13 to 0.23.18 or later in pom.xml or build.gradle, then rebuild and redeploy.

Maven · org.http4s:blaze-http_2.12 · FIXED · 0.23.18 · vulnerable: <= 0.23.17 · source

Set org.http4s:blaze-http_2.12 to 0.23.18 or later in pom.xml or build.gradle, then rebuild and redeploy.

Maven · org.http4s:blaze-http_3 · FIXED · 0.23.18 · vulnerable: <= 0.23.17 · source

Set org.http4s:blaze-http_3 to 0.23.18 or later in pom.xml or build.gradle, then rebuild and redeploy.

Fedora 46 · clementine · FIXED · 1.4.2-1.fc46 · FEDORA-2026-3e748ef4d3 · source

sudo dnf upgrade --advisory=FEDORA-2026-3e748ef4d3

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-2026-73495?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-73495 being exploited?

CVE-2026-73495 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-2026-73495 affect?

CVE-2026-73495 affects affected software. Severity is high (CVSS 7.4). 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-

How urgent is CVE-2026-73495?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

References

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