GNU Tar through 1.30, when --sparse is used, mishandles file shrinkage during read access, which allows local users to cause a denial of service (infinite read loop in sparse_dump_region in sparse.c) by modifying a file that is supposed to be archived by a different user's process (e.g., a system backup running as root).
総合評価: CVE-2018-20482 は公開エクスプロイトあり（50/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.53%、40 パーセンタイル） 根拠: 公開エクスプロイトが 1 件参照されています（Exploit-DB）。 推奨対応: 公開エクスプロイトが確認されています。影響範囲の確認、緩和策の適用、パッチ適用を優先してください。
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。
| EDB-ID | ソース | 種別 | 公開 | リンク |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
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 | 2026-06-15 | 0.02% | 0.53% | +0.51% |
| 2 | 2025-11-21 | 0.06% | 0.02% | -0.04% |
| 3 | 2025-11-18 | — | 0.06% | — |
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 |
|---|---|---|---|---|---|---|
| 4.7 | 3.1 | MEDIUM |
|
1.0 | 3.6 | [email protected] |
| 1.9 | 2.0 | LOW |
|
3.4 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
medium | CVE-2018-20482: 1 source package rows (tar); 15 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 10, open 5. | https://security.alpinelinux.org/vuln/CVE-2018-20482 |
debian
|
not yet assigned | CVE-2018-20482 not yet assigned priority: Debian including 1 source packages (tar), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2018-20482 |
gentoo
|
normal | CVE-2018-20482: 1 GLSA(s) (201903-05), 1 atom(s) (app-arch/tar); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2018-20482 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2018-20482 |
suse
|
low | CVE-2018-20482 severity low: SUSE including 317 source package names (0.23.1-12.3:tar-1.34-150000.3.12.1, 0.45.0.7.7.1:tar-1.30-3.3.2, …), 693 product×package rows across 405 product lines (Container bci/bci-sle15-kernel-module-devel, Container bci/kiwi, … (405 product lines)): Fixed 542, Known Affected 151. | https://www.suse.com/security/cve/CVE-2018-20482/ |
ubuntu
|
low | CVE-2018-20482 low priority: Ubuntu including 1 source packages (tar), 9 status rows across 9 suites (bionic, cosmic, disco, eoan, focal, groovy, trusty, upstream, xenial): not-affected 4, released 4, ignored 1. | https://ubuntu.com/security/CVE-2018-20482 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| gnu | tar | <= 1.30 | cpe:2.3:a:gnu:tar:*:*:*:*:*:*:*:* |
| debian | debian_linux | 8.0 | cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* |
| debian | debian_linux | 9.0 | cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* |
| opensuse | leap | 15.0 | cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| http://git.savannah.gnu.org/cgit/tar.git/commit/?id=c15c42ccd1e2377945fd0414eca1a49294bff454 | Patch Third Party Advisory |
| http://lists.gnu.org/archive/html/bug-tar/2018-12/msg00023.html | Third Party Advisory |
| http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00077.html | Mailing List Third Party Advisory |
| http://www.securityfocus.com/bid/106354 | Third Party Advisory VDB Entry |
| https://lists.debian.org/debian-lts-announce/2018/12/msg00023.html | Mailing List Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2021/11/msg00025.html | Mailing List Third Party Advisory |
| https://news.ycombinator.com/item?id=18745431 | Exploit Third Party Advisory |
| https://security.gentoo.org/glsa/201903-05 | Third Party Advisory |
| https://twitter.com/thatcks/status/1076166645708668928 | Patch Third Party Advisory |
| https://utcc.utoronto.ca/~cks/space/blog/sysadmin/TarFindingTruncateBug | Patch Third Party Advisory |