---
id: "CVE-2026-124023"
page: "https://infrastack.ai/live/CVE-2026-124023"
kind: "vulnerability"
aliases: ["CVE-2026-124023"]
title: "Apache Axis2/C: malformed XML triggers out-of-bounds read, possible crash"
severity: "medium"
cvss: null
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["apache-axis2-c", "c", "runtime", "xml-services"]
not_affected_if: ["non-guththila-parser"]
published_at: "2026-11-12T11:17:10+00:00"
first_seen_at: "2026-11-12T11:38:04+00:00"
updated_at: "2026-11-12T11:40:07+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124023", "first_seen_at": "2026-11-12T11:38:04+00:00"}]
exploit_sources: []
---

# Apache Axis2/C: malformed XML triggers out-of-bounds read, possible crash

Link for people: https://infrastack.ai/live/CVE-2026-124023 (this .md is for agents)

Apache Axis2/C's Guththila XML parser can return a raw input byte where an event code is expected, and the AXIOM wrapper uses it as an unchecked index into a ten-entry table, reading heap memory past its end. An unauthenticated attacker can send a crafted XML request to cause misparsing or, in some cases, a process crash, though the memory read is not returned to the client.

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

## How to check

- Check whether the server is built with Guththila, the default XML parser in Axis2/C.
- Check the Axis2/C version in use; the sources say affected versions run through `2.0.0`.

## Fix

- Fix is in commits `23110287924e79d05a5b4712298c355d1f05c606` and `f01683ec10e8fddb87279ec9351b3239021223e6`, to be included in the next release; no release version is named in the sources.

## Timeline

- 2026-11-12T11:38:04+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124023

## Documents

- [fix] Patch: github.com https://github.com/apache/axis-axis2-c-core/commit/23110287924e79d05a5b4712298c355d1f05c606
- [fix] Patch: github.com https://github.com/apache/axis-axis2-c-core/commit/f01683ec10e8fddb87279ec9351b3239021223e6

## From the sources

Out-of-bounds Read vulnerability in the Guththila XML parser wrapper of Apache Axis2/C. On some malformed XML input the Guththila parser returned a raw input byte in place of an event code, and the AXIOM reader wrapper used that value as an index into a ten-entry lookup table without checking its range, reading heap memory past the end of the table. An unauthenticated client could trigger this by sending a crafted XML request to a server built with Guththila, the default parser, causing the request to be parsed incorrectly or, in some cases, the process to crash. The memory read is not returned to the client. This issue affects Apache Axis2/C: through 2.0.0. The fix is available in commits 23110287924e79d05a5b4712298c355d1f05c606 and f01683ec10e8fddb87279ec9351b3239021223e6 and will be included in the next release.

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