CVE-2025-61770 SUSE CVE security@suse.de SUSE Security Team SUSE CVE-2025-61770 Interim 1 4 2026-03-05T00:28:00Z current 2025-11-01T00:15:14Z 2026-03-05T00:28:00Z cve-database/bin/generate-cvrf-cve.pl 2020-12-27T01:00:00Z CVE-2025-61770 Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, `Rack::Multipart::Parser` buffers the entire multipart preamble (bytes before the first boundary) in memory without any size limit. A client can send a large preamble followed by a valid boundary, causing significant memory use and potential process termination due to out-of-memory (OOM) conditions. Remote attackers can trigger large transient memory spikes by including a long preamble in multipart/form-data requests. The impact scales with allowed request sizes and concurrency, potentially causing worker crashes or severe slowdown due to garbage collection. Versions 2.2.19, 3.1.17, and 3.2.2 enforce a preamble size limit (e.g., 16 KiB) or discard preamble data entirely. Workarounds include limiting total request body size at the proxy or web server level and monitoring memory and set per-process limits to prevent OOM conditions. The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). https://lists.suse.com/pipermail/suse-liberty-linux-updates/2025-November/002167.html E-Mail link for RHSA-2025:19512 https://lists.suse.com/pipermail/suse-liberty-linux-updates/2025-November/002181.html E-Mail link for RHSA-2025:19719 https://www.suse.com/support/security/rating/ SUSE Security Ratings SUSE Liberty Linux 8 SUSE Liberty Linux 9 SUSE Linux Enterprise High Availability Extension 15 SP3 SUSE Linux Enterprise High Availability Extension 15 SP4 SUSE Linux Enterprise High Availability Extension 15 SP5 SUSE Linux Enterprise High Availability Extension 15 SP6 SUSE Linux Enterprise High Availability Extension 15 SP7 openSUSE Leap 15.6 openSUSE Tumbleweed pcs-0.10.18-2.el8_10.7 pcs-0.11.9-2.el9_6.2 pcs-snmp-0.10.18-2.el8_10.7 pcs-snmp-0.11.9-2.el9_6.2 ruby2.5-rubygem-rack ruby2.5-rubygem-rack-1_6 ruby2.5-rubygem-rack-doc ruby2.5-rubygem-rack-doc-1_6 ruby2.5-rubygem-rack-testsuite ruby2.5-rubygem-rack-testsuite-1_6 ruby3.4-rubygem-rack-2.2-2.2.19-1.1 ruby4.0-rubygem-rack-2.2-2.2.22-1.1 rubygem-rack rubygem-rack-1_6 pcs-0.10.18-2.el8_10.7 as a component of SUSE Liberty Linux 8 pcs-snmp-0.10.18-2.el8_10.7 as a component of SUSE Liberty Linux 8 pcs-0.11.9-2.el9_6.2 as a component of SUSE Liberty Linux 9 pcs-snmp-0.11.9-2.el9_6.2 as a component of SUSE Liberty Linux 9 ruby3.4-rubygem-rack-2.2-2.2.19-1.1 as a component of openSUSE Tumbleweed ruby4.0-rubygem-rack-2.2-2.2.22-1.1 as a component of openSUSE Tumbleweed ruby2.5-rubygem-rack as a component of SUSE Linux Enterprise High Availability Extension 15 SP3 rubygem-rack as a component of SUSE Linux Enterprise High Availability Extension 15 SP3 ruby2.5-rubygem-rack as a component of SUSE Linux Enterprise High Availability Extension 15 SP4 rubygem-rack as a component of SUSE Linux Enterprise High Availability Extension 15 SP4 ruby2.5-rubygem-rack as a component of SUSE Linux Enterprise High Availability Extension 15 SP5 rubygem-rack as a component of SUSE Linux Enterprise High Availability Extension 15 SP5 ruby2.5-rubygem-rack as a component of SUSE Linux Enterprise High Availability Extension 15 SP6 rubygem-rack as a component of SUSE Linux Enterprise High Availability Extension 15 SP6 ruby2.5-rubygem-rack as a component of SUSE Linux Enterprise High Availability Extension 15 SP7 rubygem-rack as a component of SUSE Linux Enterprise High Availability Extension 15 SP7 ruby2.5-rubygem-rack as a component of openSUSE Leap 15.6 ruby2.5-rubygem-rack-doc as a component of openSUSE Leap 15.6 ruby2.5-rubygem-rack-testsuite as a component of openSUSE Leap 15.6 rubygem-rack as a component of openSUSE Leap 15.6 ruby2.5-rubygem-rack-1_6 as a component of openSUSE Leap 15.6 ruby2.5-rubygem-rack-doc-1_6 as a component of openSUSE Leap 15.6 ruby2.5-rubygem-rack-testsuite-1_6 as a component of openSUSE Leap 15.6 rubygem-rack-1_6 as a component of openSUSE Leap 15.6 Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, `Rack::Multipart::Parser` buffers the entire multipart preamble (bytes before the first boundary) in memory without any size limit. A client can send a large preamble followed by a valid boundary, causing significant memory use and potential process termination due to out-of-memory (OOM) conditions. Remote attackers can trigger large transient memory spikes by including a long preamble in multipart/form-data requests. The impact scales with allowed request sizes and concurrency, potentially causing worker crashes or severe slowdown due to garbage collection. Versions 2.2.19, 3.1.17, and 3.2.2 enforce a preamble size limit (e.g., 16 KiB) or discard preamble data entirely. Workarounds include limiting total request body size at the proxy or web server level and monitoring memory and set per-process limits to prevent OOM conditions. CVE-2025-61770 SUSE Liberty Linux 8:pcs-0.10.18-2.el8_10.7 SUSE Liberty Linux 8:pcs-snmp-0.10.18-2.el8_10.7 SUSE Liberty Linux 9:pcs-0.11.9-2.el9_6.2 SUSE Liberty Linux 9:pcs-snmp-0.11.9-2.el9_6.2 openSUSE Tumbleweed:ruby3.4-rubygem-rack-2.2-2.2.19-1.1 openSUSE Tumbleweed:ruby4.0-rubygem-rack-2.2-2.2.22-1.1 openSUSE Leap 15.6:ruby2.5-rubygem-rack-1_6 openSUSE Leap 15.6:ruby2.5-rubygem-rack-doc-1_6 openSUSE Leap 15.6:ruby2.5-rubygem-rack-testsuite-1_6 openSUSE Leap 15.6:rubygem-rack-1_6 important 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H