{"id":"UBUNTU-CVE-2026-53655","details":"node-tar is a full-featured Tar for Node.js. Prior to 7.5.16, tar (node-tar) applies a PAX extended header's size= record (and other PAX overrides) to the next header entry of any type, including intermediary metadata headers such as a GNU long-name (L) or long-link (K) entry. Per POSIX pax, a PAX extended header (x) describes the next file entry, not the intermediary extension headers that may sit between the x header and the file it annotates. Because node-tar lets the PAX size override the byte length of an intervening L/K/x header, an attacker can desynchronize node-tar's stream cursor relative to every other mainstream tar implementation (GNU tar, libarchive/bsdtar, Python tarfile, and the now-fixed tar-rs / astral-tokio-tar). The result is a tar parser interpretation differential (CWE-436): a single crafted archive yields a different set of members under node-tar than under the reference tar tools. An attacker can use this to hide a member from one parser while it is visible to another, which defeats security tooling whose scanner and extractor disagree on archive contents (e.g. a malware/secret scanner that lists entries with one library while a downstream step extracts with another) This vulnerability is fixed in 7.5.16.","modified":"2026-06-29T13:50:41.501009411Z","published":"2026-06-22T16:16:00Z","upstream":["CVE-2026-53655"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-53655"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-53655"}],"affected":[{"package":{"name":"node-tar","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/node-tar?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.1.18-1","0.1.18-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.1.18-1ubuntu0.1~esm1","binary_name":"node-tar"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53655.json"}},{"package":{"name":"node-tar","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/node-tar?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.3-2","1.0.3-2ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.0.3-2ubuntu0.1~esm1","binary_name":"node-tar"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53655.json"}},{"package":{"name":"node-tar","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/node-tar?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"node-tar","binary_version":"2.2.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53655.json"}},{"package":{"name":"node-tar","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/node-tar?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.10+ds1-2","4.4.10+ds1-2ubuntu1","4.4.10+ds1-2ubuntu1+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.4.10+ds1-2ubuntu1+esm1","binary_name":"node-tar"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53655.json"}},{"package":{"name":"node-tar","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/node-tar?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.1.7+~cs11.3.10-1","6.1.11+~cs11.3.10-1","6.1.11+ds1+~cs6.0.6-1"],"ecosystem_specific":{"binaries":[{"binary_version":"6.1.11+ds1+~cs6.0.6-1","binary_name":"node-tar"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53655.json"}},{"package":{"name":"node-tar","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/node-tar?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.1.13+~cs7.0.5-1","6.1.13+~cs7.0.5-3"],"ecosystem_specific":{"binaries":[{"binary_name":"node-tar","binary_version":"6.1.13+~cs7.0.5-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53655.json"}},{"package":{"name":"node-tar","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/node-tar?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.2.1+~cs7.0.8-1"],"ecosystem_specific":{"binaries":[{"binary_name":"node-tar","binary_version":"6.2.1+~cs7.0.8-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53655.json"}},{"package":{"name":"node-tar","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/node-tar?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.2.1+~cs7.0.8-1","6.2.1+ds1+~cs6.1.13-6","6.2.1+ds1+~cs6.1.13-7","6.2.1+ds1+~cs6.1.13-10"],"ecosystem_specific":{"binaries":[{"binary_version":"6.2.1+ds1+~cs6.1.13-10","binary_name":"node-tar"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53655.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}