CVE-2026-113582 Apache Software Foundation CVE debrief

Who should care

Defenders and developers using Apache Abdera, especially those with applications parsing untrusted XML, should assess exposure and prioritize migration to a maintained alternative. Downstream products including affected Abdera artifacts may also be impacted.

Why it matters

CVE-2026-113582 is a high-severity vulnerability in the retired Apache Abdera project, affecting all versions. Defenders should prioritize migration and verify exposure due to potential data access and server-side request forgery risks.

• Potential unauthorized access to sensitive data
• Possible server-side request forgery
• Need for urgent migration to a supported alternative
• Verification of downstream product impacts required

Technical summary

Apache Abdera is vulnerable to XML external entity expansion when parsing Atom documents. This issue, affecting all versions of Apache Abdera, allows attackers to access sensitive data or make server-side requests. Apache Abdera is retired and no longer supported, with no planned fix. The vulnerability arises from improper restriction of XML external entity references, posing risks of data access and server-side request forgery. Users are recommended to migrate to a maintained alternative to mitigate these risks. Downstream products that include affected Abdera artifacts may also be impacted.

Defensive priority

High priority for migration and mitigation due to high CVSS score and lack of support for Apache Abdera.

Recommended defensive actions

• Migrate to a maintained alternative to Apache Abdera
• Ensure that untrusted XML cannot reach the affected Abdera parser or JDBC adapter parsing paths
• Verify and update inventory to identify potentially impacted downstream products
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability in Apache Abdera, which is retired and no longer supported. The issue affects all versions of Apache Abdera and allows an attacker to access sensitive data or make server-side requests when an application parses attacker-controlled XML with Abdera.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.