← Vulnerability feed

Vulnerability record · CVE-2025-49506 · published 6 August 2026

CVE-2025-49506: Apache apr-util vulnerability

Apache · Apr Util

APR-util versions 1.6.3 (and earlier) function apr_password_validate() was not constant-time with regards to hashes or passwords comparisons, potentially leaking their content via a side channel timing attack particularly on platforms without crypt() such as  Windows, BeOS, NetWare, or Android. Users are recommended to upgrade to version 1.6.4, which fixes this issue.

7.5 CVSS 3.1 High EPSS 0.38% · top 70.7% CWE-208 · CWE-208
7.5CVSS 3.1 base score
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
7 Aug 2026Last modified by NVD

Description

APR-util versions 1.6.3 (and earlier) function apr_password_validate() was not constant-time with regards to hashes or passwords comparisons, potentially leaking their content via a side channel timing attack particularly on platforms without crypt() such as  Windows, BeOS, NetWare, or Android. Users are recommended to upgrade to version 1.6.4, which fixes this issue.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.apache.org/thread/2v8o3bj9pb7lfcr57bdnjg9xfkj04mg5 Mailing ListVendor Advisory
http://www.openwall.com/lists/oss-security/2026/08/06/8 Mailing ListThird Party Advisory

Track CVE-2025-49506 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2009-2412Apache apr-util vulnerabilityMultiple integer overflows in the Apache Portable Runtime (APR) library and the Apache Portable Utility library (aka APR-util) 0.9.x and 1.3.x allow …EPSS 14%9.1CVE-2026-32327Apache apr-util vulnerabilityA 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 an…EPSS 0.46%9.1CVE-2026-34191Apache apr-util sql injection vulnerabilityImproper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in Apache Portable Runtime Utility via apr_dbd_ora…EPSS 0.59%7.5CVE-2026-34501Apache apr-util heap-based buffer overflow vulnerabilityHeap-based Buffer Overflow vulnerability in Apache Portable Runtime Utility redis client. This issue affects Apache Portable Runtime Utility: from 1.…EPSS 0.51%7.5CVE-2026-34502Apache apr-util heap-based buffer overflow vulnerabilityHeap-based Buffer Overflow vulnerability in Apache Portable Runtime Utility memcached client This issue affects Apache Portable Runtime Utility: from…EPSS 0.51%7.5CVE-2009-1955Apache APR-util expat XML parser nested entity denial of serviceThe expat XML parser in the apr_xml_* interface in Apache APR-util before 1.3.7 mishandles XML documents containing a large number of nested entity r…EPSS 53%analysed6.4CVE-2009-1956Apache apr-util vulnerabilityOff-by-one error in the apr_brigade_vprintf function in Apache APR-util before 1.3.5 on big-endian platforms allows remote attackers to obtain sensit…EPSS 12%5.0CVE-2010-1623Apache apr-util memory buffer overflow vulnerabilityMemory leak in the apr_brigade_split_line function in buckets/apr_brigade.c in the Apache Portable Runtime Utility library (aka APR-util) before 1.3.…EPSS 20%

Source: NIST National Vulnerability Database (record CVE-2025-49506), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.