CVE-2026-124023
Received Received - Intake

Out-of-bounds Read in Apache Axis2/C Guththila Parser

Publication date: 2026-11-12

Last updated on: 2026-11-12

Assigner: Apache Software Foundation

Description
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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Meta Information

Published
2026-11-12
Last Modified
2026-11-12
Generated
2026-11-12
AI Q&A
2026-11-12
EPSS Evaluated
N/A
NVD
CVE-2026-124023
EUVD
EUVD-2026-124339

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
Apache Software Foundation Apache Axis2/C From 0 (inc) to 2.0.0 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-125 The product reads data past the end, or before the beginning, of the intended buffer.

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Executive Summary

This is an out-of-bounds read vulnerability in Apache Axis2/C's Guththila XML parser. When processing malformed XML input, the parser returns a raw byte instead of a valid event code. The wrapper function then uses this byte as an index into a lookup table without checking if it is within bounds, potentially reading memory outside the table. This can cause incorrect parsing or crashes.

Detection Guidance

Detecting this vulnerability requires monitoring for crashes or memory corruption when processing XML with Apache Axis2/C using Guththila. Check server logs for segmentation faults or unexpected terminations during XML parsing. Use tools like Valgrind to detect out-of-bounds reads when running Axis2/C services. Inspect network traffic for malformed XML requests containing unusual declarations or entities.

Impact Analysis

An unauthenticated attacker could send a crafted XML request to a server using the vulnerable Guththila parser. This may cause the server to parse the request incorrectly or crash entirely. The memory read does not expose data to the attacker, but service disruption is possible.

Compliance Impact

This vulnerability does not directly impact compliance with GDPR or HIPAA as it does not involve unauthorized data access or disclosure. However, it could affect system availability and integrity, which are indirectly related to compliance requirements for secure processing and availability of data.

Mitigation Strategies

Apply the provided patches from commits 23110287924e79d05a5b4712298c355d1f05c606 and f01683ec10e8fddb87279ec9351b3239021223e6. If patches are unavailable, disable the Guththila parser in Axis2/C configuration and switch to an alternative XML parser. Restrict network access to Axis2/C services to trusted clients only. Monitor for suspicious XML input patterns that may trigger the vulnerability.

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