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TI-2026-48560 Aliases CVE-2026-69216GHSA-jrpm-956j-96jg

Http4s: Ember chunk parser lenience (TE.TE request smuggling)

Priority LOW 25CWE-444Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s chunk decoder trims the chunk-size token and accepts leading plus or minus signs instead of requiring one or more hexadecimal digits followed by the required CRLF. When an intermediary forwards chunked data without re-encoding and interprets malformed chunk boundaries differently, an unauthenticated attacker can create TE.TE request smuggling that bypasses intermediary controls, poisons caches, or hijacks the request queue. The same response-path leniency can enable response smuggling against an ember-client used as a gateway when the upstream is malicious or compromised. This issue is fixed in versions 0.23.35 and 1.0.0-M47.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00368 30th percentileScored 2026-11-07
Fix Fixed http4s (http4s): 0.23.35, 1.0.0-M47org.http4s:http4s-ember-core_2.12 (Maven): 0.23.35+2 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
http4shttp4sbefore 0.23.35; 1.0.0-M1 to before 1.0.0-M470.23.35, 1.0.0-M47Patch availableCNA
—org.http4s:http4s-ember-core_2.12 (Maven)before 0.23.350.23.35Patch availableGHSA-jrpm-956j-96jg
—org.http4s:http4s-ember-core_2.13 (Maven)before 0.23.350.23.35Patch availableGHSA-jrpm-956j-96jg
—org.http4s:http4s-ember-core_3 (Maven)before 0.23.350.23.35Patch availableGHSA-jrpm-956j-96jg
—org.http4s:http4s-ember-core_2.13 (Maven)1.0.0-M1 to before 1.0.0-M471.0.0-M47Patch availableGHSA-jrpm-956j-96jg
—org.http4s:http4s-ember-core_3 (Maven)1.0.0-M1 to before 1.0.0-M471.0.0-M47Patch availableGHSA-jrpm-956j-96jg
  • http4s Vendorhttp4s Affected before 0.23.35; 1.0.0-M1 to before 1.0.0-M47 Fixed in 0.23.35, 1.0.0-M47 Patch available CNA
  • org.http4s:http4s-ember-core_2.12 (Maven) Vendor— Affected before 0.23.35 Fixed in 0.23.35 Patch available GHSA-jrpm-956j-96jg
  • org.http4s:http4s-ember-core_2.13 (Maven) Vendor— Affected before 0.23.35 Fixed in 0.23.35 Patch available GHSA-jrpm-956j-96jg
  • org.http4s:http4s-ember-core_3 (Maven) Vendor— Affected before 0.23.35 Fixed in 0.23.35 Patch available GHSA-jrpm-956j-96jg
  • org.http4s:http4s-ember-core_2.13 (Maven) Vendor— Affected 1.0.0-M1 to before 1.0.0-M47 Fixed in 1.0.0-M47 Patch available GHSA-jrpm-956j-96jg
  • org.http4s:http4s-ember-core_3 (Maven) Vendor— Affected 1.0.0-M1 to before 1.0.0-M47 Fixed in 1.0.0-M47 Patch available GHSA-jrpm-956j-96jg

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:typelevel:http4s:*:*:*:*:*:*:*:*——http4s
  • cpe:2.3:a:typelevel:http4s:*:*:*:*:*:*:*:* Versions — — ·http4s

Remediation

  • Fix · CNA http4s (http4s) Fixed in 0.23.35, 1.0.0-M47
  • Fix · GHSA-jrpm-956j-96jg org.http4s:http4s-ember-core_2.12 (Maven) Fixed in 0.23.35 Advisory →
  • Fix · GHSA-jrpm-956j-96jg org.http4s:http4s-ember-core_2.13 (Maven) Fixed in 0.23.35 Advisory →
  • Fix · GHSA-jrpm-956j-96jg org.http4s:http4s-ember-core_3 (Maven) Fixed in 0.23.35 Advisory →
  • Fix · GHSA-jrpm-956j-96jg org.http4s:http4s-ember-core_2.13 (Maven) Fixed in 1.0.0-M47 Advisory →
  • Fix · GHSA-jrpm-956j-96jg org.http4s:http4s-ember-core_3 (Maven) Fixed in 1.0.0-M47 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-69216
  2. 2026-10-03 Alias added: GHSA-jrpm-956j-96jg

References

Other 5

  • TI-2022-13223 mTLS client verification is skipped in fs2 on Node.js CVSS 3.1CRITICAL 9.8
  • TI-2023-08714 Http4s has fatal error parsing User-Agent and Server headers CVSS 3.1HIGH 7.5
  • TI-2022-06031 Hash collision in typelevel jawn CVSS 3.1HIGH 7.5
  • TI-2025-37261 Http4s vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer section CVSS 4.0MEDIUM 6.3
  • TI-2026-44185 http4s-scala-xml has an XML External Entity (XXE) processing issue CVSS 3.1CRITICAL 9.3
  • TI-2020-04336 Local file inclusion vulnerability in http4s CVSS 3.1HIGH 7.6
See all 36 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences