CVE-2025-49506 Apache Portable Runtime Utility: apr_password_validate() vulnerable to timing attack
An attacker can potentially leak password or hash content via timing side-channel attacks in apr_password_validate() on platforms lacking crypt().
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-49506?
CVE-2025-49506 is a high-severity vulnerability in Apache Portable Runtime Utility, published on 6 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-208
Which versions are affected by CVE-2025-49506?
1 open source package ship an affected version, including apr-util. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
apr-util Bitnami | From 1.2.0 | 1.6.4 |
Products include Apache Apr-Util.
How do I fix CVE-2025-49506?
Upgrade apr-util to 1.6.4 or later.
Is CVE-2025-49506 being exploited?
There is no known exploitation of CVE-2025-49506 in the wild and no public exploit code.
Other vulnerabilities in Apache Portable Runtime Utility
- CVE-2009-2412 Integer overflow in n/a
- CVE-2026-32327 Apache Portable Runtime Utility: apr-util XML stack recursion crash
- CVE-2026-34191 Apache Portable Runtime Utility: SQL Injection in apr_dbd_oracle
- CVE-2026-34501 Apache Portable Runtime Utility: Heap buffer overflow in APR redis client
- CVE-2026-34502 Apache Portable Runtime Utility: Heap buffer overflow in APR memcached client
Sources
Also known as ALPINE-CVE-2025-49506, AZL-94628, BELL-CVE-2025-49506, BIT-apr-util-2025-49506, CLSA-2026-1786553851, CLSA-2026-1786623875 and 4 more.