GHSA-xrvj-v92f-53gj · 深刻度： medium · エコシステム： pip — Dulwich has unbounded memory allocation in receive-pack from crafted thin packs
Dulwich is a pure-Python implementation of the Git file formats and protocols. Starting in version 0.1.0 and prior to version 1.2.5, a client with push access could push a tiny crafted thin pack (~174 bytes) whose delta header declares a huge dest_size. When dulwich ingested it via add_thin_pack / apply_delta, it would allocate hundreds of MB of memory based on that attacker-controlled size, with no relationship to the actual bytes received. Operators running a Dulwich-based Git server that exposes git-receive-pack (i.e. accepts pushes) - for example via dulwich.server functionality, the HTTP smart server, or anything built on ReceivePackHandler - are impacted. The issue is patched in 1.2.5. add_thin_pack now accepts a max_input_size keyword (bytes; 0/None = unlimited, matching git's semantics), and ReceivePackHandler reads receive.maxInputSize from the repository config and passes it through. Wire reads are counted and a PackInputTooLarge exception is raised once the cap is exceeded - equivalent to git index-pack --max-input-size. Users should upgrade to Dulwich 1.2.5 or later and set receive.maxInputSize in their server's repository config to a sane bound for their environment. On unpatched versions, receive.maxInputSize has no effect, so it cannot be used as a workaround. Until upgrading, operators should restrict dulwich-receive-pack (push) access to trusted, authenticated clients only, or disable it entirely on servers that only need to serve fetches and/or run the server under an OS-level memory limit (e.g. ulimit, cgroups/MemoryMax, or a container memory limit) so a malicious push is killed rather than taking down the host.
総合評価: CVE-2026-47734 は低リスク（25.6/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.19%、8 パーセンタイル） 推奨対応: 悪用情報と EPSS の推移を監視し、必要に応じて優先度を見直してください。
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 | 2026-06-23 | 0.33% | 0.19% | -0.14% |
| 2 | 2026-06-15 | 0.03% | 0.33% | +0.29% |
| 3 | 2026-06-11 | — | 0.03% | — |
EPSS の全履歴 （全 3 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 |
|---|---|---|---|---|---|---|
| 5.7 | 3.1 | MEDIUM |
|
2.1 | 3.6 | [email protected] |
GHSA-xrvj-v92f-53gj · 深刻度： medium · エコシステム： pip — Dulwich has unbounded memory allocation in receive-pack from crafted thin packs
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2026-47734 not yet assigned priority: Debian including 1 source packages (dulwich), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 4, resolved 1. | https://security-tracker.debian.org/tracker/CVE-2026-47734 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2026-47734 |
suse
|
medium | — | https://www.suse.com/security/cve/CVE-2026-47734/ |
ubuntu
|
medium | CVE-2026-47734 medium priority: Ubuntu including 1 source packages (dulwich), 7 status rows across 7 suites (bionic, focal, jammy, noble, questing, resolute, upstream): needs-triage 6, released 1. | https://ubuntu.com/security/CVE-2026-47734 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| データセットに影響を受ける製品はありません。 | |||