Description
Apache Subversion's mod_dontdothat module and HTTP clients 1.4.0 through 1.8.16, and 1.9.0 through 1.9.4 are vulnerable to a denial-of-service attack caused by exponential XML entity expansion. The attack can cause the targeted process to consume an excessive amount of CPU resources or memory.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache Subversion | 1.4.0 to 1.8.16, 1.9.0 to 1.9.4 | — |
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 | subversion | 1.9.5-1 | — |
| Debian 13 | subversion | 1.9.5-1 | — |
| Debian 12 | subversion | 1.9.5-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | subversion | 1.9.3-2ubuntu1.1 | USN-3388-1 |
| Ubuntu 14.04 LTS | subversion | 1.8.8-1ubuntu3.3 | USN-3388-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | subversion | 1.8.19-25.3.1 | SUSE-SU-2017:2200-1 |
| SLES 12 SP2 | subversion | 1.8.19-25.3.1 | SUSE-SU-2017:2200-1 |
| SLES 11 SP4 | subversion | 1.6.17-1.36.9.1 | SUSE-SU-2017:2163-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Studio Onsite 1.3 | subversion | 1.6.17-1.36.9.1 | SUSE-SU-2017:2163-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | subversion | 1.9.5-1.1 | openSUSE-SU-2024:10538-1 |
Advisories 4
- USN-3388-1 subversion vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- SUSE-SU-2017:2200-1 Security update for subversion SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10538-1 libsvn_auth_gnome_keyring-1-0-1.9.5-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2163-1 Security update for subversion SUSE / openSUSE Security Updates · Feb 4, 2026
References
- 94588 vdb-entry
- [announce] 20161129 [SECURITY] Apache Subversion 1.9.5 released mailing-list
- 1037361 vdb-entry
- DSA-3932 vendor-advisory
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://subversion.apache.org/security/CVE-2016-8734-advisory.txt