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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache Portable Runtime Utility | 1.2.0 – ≤ 1.6.3 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | apr-util | 1.6.4-1 | — |
| Debian 13 | apr-util | 1.6.3-3+deb13u1 | — |
| Debian 12 | apr-util | 1.6.3-1+deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | apr-util | 1.6.3-3ubuntu3.1 | USN-8719-1 |
| Ubuntu 24.04 LTS | apr-util | 1.6.3-1.1ubuntu7.1 | USN-8719-1 |
| Ubuntu 22.04 LTS | apr-util | 1.6.1-5ubuntu4.22.04.3 | USN-8719-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | apr-util | 1.6.1-4ubuntu2.2+esm1 | USN-8719-1 |
| Ubuntu Pro 18.04 LTS | apr-util | 1.6.1-2ubuntu0.1+esm1 | USN-8719-1 |
| Ubuntu Pro 16.04 LTS | apr-util | 1.5.4-1ubuntu0.1~esm1 | USN-8719-1 |
| Ubuntu Pro 14.04 LTS | apr-util | 1.5.3-1ubuntu0.1~esm3 | USN-8719-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | apr-util +8 | 1.6.3-23.el10_2.1 | RHSA-2026:66392 |
| RHEL 9 | apr-util +8 | 1.6.1-23.el9_8.1 | RHSA-2026:66341 |
| RHEL 8 | apr-util +8 | 1.6.1-9.el8_10.1 | RHSA-2026:69113 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | apr-util +8 | 1.6.5-1.hum1 | RHSA-2026:58474 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | apr-util +8 | 1.6.3-23.el10_2.1 | ALSA-2026:66392 |
| AlmaLinux 9 | apr-util +8 | 1.6.1-23.el9_8.1 | ALSA-2026:66341 |
| AlmaLinux 8 | apr-util +8 | 1.6.1-9.el8_10.1 | ALSA-2026:69113 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | apr-util | 1.6.3-23.el10_2.1 | RLSA-2026:66392 |
| Rocky Linux 9 | apr-util | 1.6.1-23.el9_8.1 | RLSA-2026:66341 |
| Rocky Linux 8 | apr-util | 1.6.1-9.el8_10.1 | RLSA-2026:69113 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | apr-util | 1.6.1-150600.27.3.1 | SUSE-SU-2026:3938-1 |
| SLES 15 SP6 | apr-util | 1.6.1-150600.27.3.1 | SUSE-SU-2026:3938-1 |
| SLES 15 SP5 | apr-util | 1.6.1-150300.18.8.1 | SUSE-SU-2026:3937-1 |
| SLES 15 SP4 | apr-util | 1.6.1-150300.18.8.1 | SUSE-SU-2026:3937-1 |
| SLES 12 SP5 | libapr-util1 | 1.5.3-8.22.1 | SUSE-SU-2026:3905-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | apr-util | 1.6.3-160000.3.1 | SUSE-SU-2026:23551-1 |
| SLES for SAP 15 SP6 | apr-util | 1.6.1-150600.27.3.1 | SUSE-SU-2026:3938-1 |
| SLES for SAP 15 SP5 | apr-util | 1.6.1-150300.18.8.1 | SUSE-SU-2026:3937-1 |
| SLES for SAP 15 SP4 | apr-util | 1.6.1-150300.18.8.1 | SUSE-SU-2026:3937-1 |
| SLES 16.0 | apr-util | 1.6.3-160000.3.1 | SUSE-SU-2026:23551-1 |
| SLE HPC 15 SP5 | apr-util | 1.6.1-150300.18.8.1 | SUSE-SU-2026:3937-1 |
| SLE HPC 15 SP4 | apr-util | 1.6.1-150300.18.8.1 | SUSE-SU-2026:3937-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.1 | apr-util | 1.6.3-160100.3.1 | openSUSE-SU-2026:22232-1 |
| openSUSE Leap 16.0 | apr-util | 1.6.3-160000.3.1 | openSUSE-SU-2026:21672-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | apr-util | 1.6.4-r0 | — |
| Alpine v3.23 | apr-util | 1.6.4-r0 | — |
| Alpine v3.22 | apr-util | 1.6.4-r0 | — |
| Alpine v3.21 | apr-util | 1.6.4-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | apr-util +8 | 1.6.5-1.amzn2023.0.1 | ALAS2023-2026-2115 |
| Amazon Linux 2 | apr-util +9 | 1.6.5-1.amzn2.0.1 | ALAS2-2026-3892 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | apr-util | 1.6.3-3 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | apr-util +8 | 1.6.1-9.el8_10.1 | ELSA-2026-69113 |
Advisories 21
- WID-SEC-2026-2697 Apache Portable Runtime (APR): Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- openSUSE-SU-2026:22232-1 Security update for apr-util SUSE / openSUSE Security Updates · Nov 10, 2026
- ALSA-2026:66341 Moderate: apr-util security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:66392 Moderate: apr-util security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:69113 Moderate: apr-util security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:58474 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 6, 2026
- SUSE-SU-2026:23551-1 Security update for apr-util SUSE / openSUSE Security Updates · Sep 29, 2026
- ELSA-2026-69113 Moderate: apr-util security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Sep 23, 2026
- RHSA-2026:69113 Red Hat Security Advisory: apr-util security update Red Hat Security Advisories (RHSA) · Sep 22, 2026
- RLSA-2026:69113 Moderate: apr-util security update Rocky Linux Security Advisories · Sep 22, 2026
- RHSA-2026:66392 Red Hat Security Advisory: apr-util security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RHSA-2026:66341 Red Hat Security Advisory: apr-util security update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- RLSA-2026:66392 Moderate: apr-util security update Rocky Linux Security Advisories · Sep 11, 2026
- RLSA-2026:66341 Moderate: apr-util security update Rocky Linux Security Advisories · Sep 11, 2026
- SUSE-SU-2026:3937-1 Security update for apr-util SUSE / openSUSE Security Updates · Sep 10, 2026
- SUSE-SU-2026:3938-1 Security update for apr-util SUSE / openSUSE Security Updates · Sep 10, 2026
- SUSE-SU-2026:3905-1 Security update for libapr-util1 SUSE / openSUSE Security Updates · Sep 10, 2026
- USN-8719-1 apr-util vulnerabilities Ubuntu Security Notices (USN) · Sep 3, 2026
- ALAS2-2026-3892 Important: apr-util security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 31, 2026
- ALAS2023-2026-2115 Important: apr-util security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 31, 2026
- openSUSE-SU-2026:21672-1 Security update for apr-util SUSE / openSUSE Security Updates · Aug 30, 2026
References
- https://lists.apache.org/thread/2v8o3bj9pb7lfcr57bdnjg9xfkj04mg5 vendor-advisory