CVE-2018-20482GNU 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)…
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It affects Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP and 5 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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).
- CVSS
- 4.7 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mitre
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
gnu tar gnu:tar | through 1.30 | NVD |
debian debian_linux debian:debian_linux | 8.0; 9.0 | NVD |
opensuse leap opensuse:leap | 15.0 | NVD |
References
- https://utcc.utoronto.ca/~cks/space/blog/sysadmin/TarFindingTruncateBugx-refsource-misc, patch, third-party-advisory
- http://git.savannah.gnu.org/cgit/tar.git/commit/?id=c15c42ccd1e2377945fd0414eca1a49294bff454x-refsource-misc, patch, third-party-advisory
- https://lists.debian.org/debian-lts-announce/2018/12/msg00023.htmlmailing-list, x-refsource-mlist, third-party-advisory
- https://news.ycombinator.com/item?id=18745431x-refsource-misc, exploit, third-party-advisory
- http://www.securityfocus.com/bid/106354vdb-entry, x-refsource-bid, third-party-advisory
- https://security.gentoo.org/glsa/201903-05vendor-advisory, x-refsource-gentoo, third-party-advisory
- http://lists.gnu.org/archive/html/bug-tar/2018-12/msg00023.htmlx-refsource-misc, third-party-advisory
- https://twitter.com/thatcks/status/1076166645708668928x-refsource-misc, patch, third-party-advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00077.htmlvendor-advisory, x-refsource-suse, mailing-list, third-party-advisory
- https://lists.debian.org/debian-lts-announce/2021/11/msg00025.htmlmailing-list, x-refsource-mlist, third-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.