GHSA-p543-xpfm-54cp · 深刻度： high · エコシステム： rubygems — Rack's unbounded multipart preamble buffering enables DoS (memory exhaustion)
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.
総合評価: CVE-2025-61770 は中リスク（49/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 0.87%、54 パーセンタイル） 推奨対応: 影響資産を整理し、修補計画に組み込んでください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-07-03 | 0.85% | 0.87% | +0.02% |
| 2 | 2026-06-15 | 0.27% | 0.85% | +0.58% |
| 3 | 2026-05-25 | — | 0.27% | — |
EPSS の全履歴 （全 7 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
GHSA-p543-xpfm-54cp · 深刻度： high · エコシステム： rubygems — Rack's unbounded multipart preamble buffering enables DoS (memory exhaustion)
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2025-61770 not yet assigned priority: Debian including 1 source packages (ruby-rack), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2025-61770 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2025-61770 |
suse
|
high | CVE-2025-61770 severity important: SUSE including 10 source package names (pcs-0.10.18-2.el8_10.7, pcs-0.11.9-2.el9_6.2, …), 10 product×package rows across 4 product lines (SUSE Liberty Linux 8, SUSE Liberty Linux 9, openSUSE Leap 15.6, openSUSE Tumbleweed): Fixed 6, Known Not Affected 4. | https://www.suse.com/security/cve/CVE-2025-61770/ |
ubuntu
|
medium | CVE-2025-61770 medium priority: Ubuntu including 1 source packages (ruby-rack), 9 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): ignored 5, released 3, needs-triage 1. | https://ubuntu.com/security/CVE-2025-61770 |