---
id: "CVE-2026-112381"
kind: "vulnerability"
aliases: ["CVE-2026-112381"]
title: "Apache Traffic Server: half-closed POST request crashes the proxy via null pointer"
severity: "high"
cvss: 8.2
epss: 0.00256
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["apache-traffic-server", "proxy", "runtime", "self-hosted"]
not_affected_if: ["unaffected-version"]
published_at: "2026-10-21T20:17:23+00:00"
first_seen_at: "2026-10-23T21:57:29+00:00"
updated_at: "2026-10-25T03:03:47+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112381", "first_seen_at": "2026-10-23T21:57:29+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-112381", "first_seen_at": "2026-10-24T13:15:54+00:00"}]
---

# Apache Traffic Server: half-closed POST request crashes the proxy via null pointer

Apache Traffic Server can crash with a null pointer dereference when a client POST request is half-closed while a chunked origin response is being reparsed. The sources do not say that an attacker gets code execution; the stated impact is a crash of the server.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `traffic_server --version` or `traffic_server -V` on each proxy host and compare against the affected versions `9.2.15`, `10.1.4`, `10.2.0`
- Check whether the installed package is from the affected release line with your package manager's version query

## Fix

- Upgrade Apache Traffic Server 9.2.x to `9.2.16`
- Upgrade Apache Traffic Server 10.1.x to `10.1.5`
- Upgrade Apache Traffic Server 10.2.x to `10.2.1`

## Timeline

- 2026-10-23T21:57:29+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112381
- 2026-10-24T13:15:54+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-112381

## From the sources

Apache Traffic Server can crash with a null pointer dereference when a client POST request is torn down via half-close while a chunked origin response is being reparsed from a reentrant write-ready callback, a timing-dependent race introduced by the CVE-2021-32564 flow-control backports.



This issue affects Apache Traffic Server: 9.2.15, 10.1.4, 10.2.0.



Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_