Apache Portable Runtime Utility up to 1.6.3 apr_xml_quote_elem recursion

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.1$0-$5k1.14+

Summaryinfo

A vulnerability was found in Apache Portable Runtime Utility up to 1.6.3. It has been classified as problematic. The affected element is the function apr_xml_quote_elem. Performing a manipulation results in recursion. This vulnerability is identified as CVE-2026-32327. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Apache Portable Runtime Utility up to 1.6.3. It has been classified as problematic. This affects the function apr_xml_quote_elem. The manipulation with an unknown input leads to a recursion vulnerability. CWE is classifying the issue as CWE-674. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. This is going to have an impact on availability. The summary by CVE is:

A bug in APR-util version 1.6.3 (and earlier) allows a stack recursion attack against any library consumer which parses XML from untrusted sources and uses the apr_xml_quote_elem() function. Users are recommended to upgrade to version 1.6.4, which fixes this issue.

The advisory is shared at lists.apache.org. This vulnerability is uniquely identified as CVE-2026-32327 since 03/12/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/06/2026). MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 1.6.4 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Recursion
CWE: CWE-674 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Portable Runtime Utility 1.6.4

Timelineinfo

03/12/2026 CVE reserved
08/06/2026 +146 days Advisory disclosed
08/06/2026 +0 days VulDB entry created
08/06/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: apache.org

Advisory: lists.apache.org
Status: Confirmed

CVE: CVE-2026-32327 (🔒)
GCVE (CVE): GCVE-0-2026-32327
GCVE (VulDB): GCVE-100-386601

Entryinfo

Created: 08/06/2026 17:19
Changes: 08/06/2026 17:19 (54)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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