How severe is CVE-2013-5823?

No CVSS score has been assigned to CVE-2013-5823 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2013-5823?

CVE-2013-5823 affects the following packages: org.apache.santuario:xmlsec (Maven), org.apache.santuario:xmlsec (Maven). Ecosystems affected: Maven.

How do I fix CVE-2013-5823?

Update org.apache.santuario:xmlsec to 1.4.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2013-5823 is resolved across your whole dependency graph.

How do I detect CVE-2013-5823 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.santuario:xmlsec, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2013-5823 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against CVE-2013-5823?

O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2013-5823 can be triaged on real exposure rather than presence alone.

Is CVE-2013-5823 actively exploited in the wild?

No public exploit code has been indexed for CVE-2013-5823 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2013-5823?

CVE-2013-5823 has an EPSS (Exploit Prediction Scoring System) score of 4.7%, placing it in the 91th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

When was CVE-2013-5823 published, and has it been updated?

CVE-2013-5823 was published on May 14, 2022 and was last updated on September 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕ Maven

Not in CISA KEV

CVE-2013-5823 — xmlsec

Fix: apache/santuario-java@55a4849

CVE-2013-5823 is a security vulnerability in org.apache.santuario:xmlsec. A fix is available for org.apache.santuario:xmlsec — see the affected versions and patch details below.

Apache XML Security For Java vulnerable to Infinite Loop

Published

May 14, 2022

Updated

Sep 10, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Sep 21, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

4.7%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs91th percentile — riskier than 91% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Real-World Exposure

2 pkgs affected

☕org.apache.santuario:xmlsec☕org.apache.santuario:xmlsec

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Affected versions of xmlsec are subject to a denial of service vulnerability. Should a user check the signature of a message larger than 512 MB, the method expandSize(int newPos) of class org.apache.xml.security.utils.UnsyncByteArrayOutputStream goes in an endless loop. A remote attacker could use this flaw to supply crafted XML that would lead to a denial of service.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.apache.santuario:xmlsec`	≥ 1.4.0&&< 1.4.8	1.4.8`org.apache.santuario:xmlsec:1.4.8`
☕Maven	`org.apache.santuario:xmlsec`	≥ 1.5.0&&< 1.5.3	1.5.3`org.apache.santuario:xmlsec:1.5.3`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.santuario:xmlsec, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.apache.santuario:xmlsec to 1.4.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2013-5823 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2013-5823 can be triaged on real exposure rather than presence alone.

Tailored to CVE-2013-5823. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

Product	Fixed in	Advisory
Oracle Java for Red Hat Enterprise Linux 5	`java-1.6.0-sun-1:1.6.0.75-1jpp.3.el5_10`	RHSA-2014:0414
Red Hat Enterprise Linux 5	`java-1.7.0-openjdk-1:1.7.0.45-2.4.3.1.el5_10`	RHSA-2013:1447
Red Hat Enterprise Linux 5	`java-1.6.0-openjdk-1:1.6.0.0-1.42.1.11.14.el5_10`	RHSA-2013:1505
Red Hat Enterprise Linux 6	`java-1.7.0-openjdk-1:1.7.0.45-2.4.3.2.el6_4`	RHSA-2013:1451
Red Hat Network Satellite Server v 5.4	`java-1.6.0-ibm-1:1.6.0.15.0-1jpp.1.el5`	RHSA-2013:1793
Supplementary for Red Hat Enterprise Linux 5	`java-1.7.0-oracle-1:1.7.0.45-1jpp.1.el5_10`	RHSA-2013:1440
Supplementary for Red Hat Enterprise Linux 5	`java-1.7.0-ibm-1:1.7.0.6.0-1jpp.1.el5_10`	RHSA-2013:1507
Supplementary for Red Hat Enterprise Linux 5	`java-1.6.0-ibm-1:1.6.0.15.0-1jpp.1.el5_10`	RHSA-2013:1508

Frequently Asked Questions

Affected versions of xmlsec are subject to a denial of service vulnerability. Should a user check the signature of a message larger than 512 MB, the method `expandSize(int newPos)` of class `org.apache.xml.security.utils.UnsyncByteArrayOutputStream` goes in an endless loop. A remote attacker could use this flaw to supply crafted XML that would lead to a denial of service.

O3 Security · Impact-Aware SCA

Is CVE-2013-5823 in your dependencies?

O3 Security finds CVE-2013-5823 across Maven dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

Scan my dependencies How O3 SCA works