{"id":"CVE-2026-39973","aliases":["EUVD-2026-24043","GHSA-m8mh-x359-vm8m","UBUNTU-CVE-2026-39973"],"status":"published","title":"Apktool: Path Traversal to Arbitrary File Write","description":"Apktool is a tool for reverse engineering Android APK files. In versions 3.0.0 and 3.0.1, a path traversal vulnerability in `brut/androlib/res/decoder/ResFileDecoder.java` allows a maliciously crafted APK to write arbitrary files to the filesystem during standard decoding (`apktool d`). This is a security regression introduced in commit e10a045 (PR #4041, December 12, 2025), which removed the `BrutIO.sanitizePath()` call that previously prevented path traversal in resource file output paths. An attacker can embed `../` sequences in the `resources.arsc` Type String Pool to escape the output directory and write files to arbitrary locations, including `~/.ssh/config`, `~/.bashrc`, or Windows Startup folders, escalating to RCE. The fix in version 3.0.2 re-introduces `BrutIO.sanitizePath()` in `ResFileDecoder.java` before file write operations.","severity":{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00182,"percentile":0.0789,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-22"],"published":"2026-04-21T01:35:22Z","modified":"2026-10-28T02:30:37Z","exploits":[{"source":"pocgithub","id":"frawlaboy/CVE-2026-39973-PoC","title":"frawlaboy/CVE-2026-39973-PoC","date":"2026-04-30","url":"https://github.com/frawlaboy/CVE-2026-39973-PoC"}],"fixes":[{"ecosystem":"Maven","package":"org.apktool:apktool-lib","fixed_in":["3.0.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.apktool:apktool-lib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.0.2"}]}]},{"source":"osv","ecosystem":"Maven","package":"org.apktool:apktool-lib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.0.2"}]}],"versions":["3.0.0","3.0.1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"apktool","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.2+dfsg-1","2.0.2+dfsg-2"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"apktool","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.4+dfsg-1","2.3.0+dfsg-1","2.3.1+dfsg-1","2.3.4-1~18.04"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"apktool","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.0-1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"apktool","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.0+dfsg.1-2build1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"apktool","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.0+dfsg-6","2.7.0+dfsg-7"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"apktool","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.0+dfsg-7"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"apktool","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.0+dfsg-7.1ubuntu1","2.7.0+dfsg-7.2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"apktool","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.0+dfsg-7","2.7.0+dfsg-7.1ubuntu1"]}],"products":[{"vendor":"apktool","product":"apktool"},{"vendor":"ibotpeaches","product":"apktool"}],"references":[{"url":"https://github.com/iBotPeaches/Apktool/security/advisories/GHSA-m8mh-x359-vm8m","tags":["x_refsource_CONFIRM","Mitigation","Vendor Advisory","advisory","web"]},{"url":"https://github.com/iBotPeaches/Apktool/pull/4041","tags":["x_refsource_MISC","Issue Tracking","fix","web"]},{"url":"https://github.com/iBotPeaches/Apktool/commit/e10a0450c7afcd9462c0b76bcbff0e7428b92bdd#diff-cd531ebe1014bfd18185bf21585ca5cdb16fbcb07703ebc47949a1b4e4e36bc3","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/iBotPeaches/Apktool/releases/tag/v3.0.2","tags":["x_refsource_MISC","Product","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39973","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-m8mh-x359-vm8m"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39973.json","tags":["advisory"]},{"url":"https://github.com/iBotPeaches/Apktool","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-39973","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-39973","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-39973","title":"Apktool: Path Traversal to Arbitrary File Write","description":"Apktool is a tool for reverse engineering Android APK files. In versions 3.0.0 and 3.0.1, a path traversal vulnerability in `brut/androlib/res/decoder/ResFileDecoder.java` allows a maliciously crafted APK to write arbitrary files to the filesystem during standard decoding (`apktool d`). This is a security regression introduced in commit e10a045 (PR #4041, December 12, 2025), which removed the `BrutIO.sanitizePath()` call that previously prevented path traversal in resource file output paths. An attacker can embed `../` sequences in the `resources.arsc` Type String Pool to escape the output directory and write files to arbitrary locations, including `~/.ssh/config`, `~/.bashrc`, or Windows Startup folders, escalating to RCE. The fix in version 3.0.2 re-introduces `BrutIO.sanitizePath()` in `ResFileDecoder.java` before file write operations.","status":"published","published":"2026-04-21T01:35:22.396Z","modified":"2026-04-23T03:56:04.482Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:20:02.662847Z"}],"euvd":[{"id":"EUVD-2026-24043","description":"Apktool is a tool for reverse engineering Android APK files. In versions 3.0.0 and 3.0.1, a path traversal vulnerability in `brut/androlib/res/decoder/ResFileDecoder.java` allows a maliciously crafted APK to write arbitrary files to the filesystem during standard decoding (`apktool d`). This is a security regression introduced in commit e10a045 (PR #4041, December 12, 2025), which removed the `BrutIO.sanitizePath()` call that previously prevented path traversal in resource file output paths. An attacker can embed `../` sequences in the `resources.arsc` Type String Pool to escape the output directory and write files to arbitrary locations, including `~/.ssh/config`, `~/.bashrc`, or Windows Startup folders, escalating to RCE. The fix in version 3.0.2 re-introduces `BrutIO.sanitizePath()` in `ResFileDecoder.java` before file write operations.","status":"published","published":"2026-04-21T01:35:22Z","modified":"2026-04-23T03:56:04Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T19:24:19.81608Z"}],"ghsa":[{"id":"GHSA-m8mh-x359-vm8m","title":"Apktool: Path Traversal to Arbitrary File Write","description":"A path traversal vulnerability in `brut/androlib/res/decoder/ResFileDecoder.java` allows a maliciously crafted APK to write arbitrary files to the filesystem during standard decoding (`apktool d`). This is a security regression introduced in commit [e10a045](https://github.com/iBotPeaches/Apktool/commit/e10a0450c7afcd9462c0b76bcbff0e7428b92bdd#diff-cd531ebe1014bfd18185bf21585ca5cdb16fbcb07703ebc47949a1b4e4e36bc3) ([PR #4041](https://github.com/iBotPeaches/Apktool/pull/4041), December 12, 2025), which removed the `BrutIO.sanitizePath()` call that previously prevented path traversal in resource file output paths.\n\nAn attacker can embed `../` sequences in the `resources.arsc` Type String Pool to escape the output directory and write files to arbitrary locations, including `~/.ssh/config`, `~/.bashrc`, or Windows Startup folders, escalating to RCE.\n\n**Fix:** Re-introduce `BrutIO.sanitizePath()` in `ResFileDecoder.java` before file write operations.","status":"published","published":"2026-04-23T21:24:28Z","modified":"2026-04-23T21:24:30Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:39:56.453138Z"}],"nvd":[{"id":"CVE-2026-39973","description":"Apktool is a tool for reverse engineering Android APK files. In versions 3.0.0 and 3.0.1, a path traversal vulnerability in `brut/androlib/res/decoder/ResFileDecoder.java` allows a maliciously crafted APK to write arbitrary files to the filesystem during standard decoding (`apktool d`). This is a security regression introduced in commit e10a045 (PR #4041, December 12, 2025), which removed the `BrutIO.sanitizePath()` call that previously prevented path traversal in resource file output paths. An attacker can embed `../` sequences in the `resources.arsc` Type String Pool to escape the output directory and write files to arbitrary locations, including `~/.ssh/config`, `~/.bashrc`, or Windows Startup folders, escalating to RCE. The fix in version 3.0.2 re-introduces `BrutIO.sanitizePath()` in `ResFileDecoder.java` before file write operations.","status":"published","published":"2026-04-21T02:16:07.903Z","modified":"2026-10-26T22:10:00.163Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:12:15.120927Z"}],"osv":[{"id":"CVE-2026-39973","title":"Apktool: Path Traversal to Arbitrary File Write","description":"Apktool is a tool for reverse engineering Android APK files. In versions 3.0.0 and 3.0.1, a path traversal vulnerability in `brut/androlib/res/decoder/ResFileDecoder.java` allows a maliciously crafted APK to write arbitrary files to the filesystem during standard decoding (`apktool d`). This is a security regression introduced in commit e10a045 (PR #4041, December 12, 2025), which removed the `BrutIO.sanitizePath()` call that previously prevented path traversal in resource file output paths. An attacker can embed `../` sequences in the `resources.arsc` Type String Pool to escape the output directory and write files to arbitrary locations, including `~/.ssh/config`, `~/.bashrc`, or Windows Startup folders, escalating to RCE. The fix in version 3.0.2 re-introduces `BrutIO.sanitizePath()` in `ResFileDecoder.java` before file write operations.","status":"published","published":"2026-04-21T01:35:22.396Z","modified":"2026-10-28T02:30:37.229732119Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:45:03.040464Z"},{"id":"GHSA-m8mh-x359-vm8m","title":"Apktool: Path Traversal to Arbitrary File Write","description":"A path traversal vulnerability in `brut/androlib/res/decoder/ResFileDecoder.java` allows a maliciously crafted APK to write arbitrary files to the filesystem during standard decoding (`apktool d`). This is a security regression introduced in commit [e10a045](https://github.com/iBotPeaches/Apktool/commit/e10a0450c7afcd9462c0b76bcbff0e7428b92bdd#diff-cd531ebe1014bfd18185bf21585ca5cdb16fbcb07703ebc47949a1b4e4e36bc3) ([PR #4041](https://github.com/iBotPeaches/Apktool/pull/4041), December 12, 2025), which removed the `BrutIO.sanitizePath()` call that previously prevented path traversal in resource file output paths.\n\nAn attacker can embed `../` sequences in the `resources.arsc` Type String Pool to escape the output directory and write files to arbitrary locations, including `~/.ssh/config`, `~/.bashrc`, or Windows Startup folders, escalating to RCE.\n\n**Fix:** Re-introduce `BrutIO.sanitizePath()` in `ResFileDecoder.java` before file write operations.","status":"published","published":"2026-04-23T21:24:28Z","modified":"2026-04-23T21:41:29.553559Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:46:51.463834Z"},{"id":"UBUNTU-CVE-2026-39973","description":"Apktool is a tool for reverse engineering Android APK files. In versions 3.0.0 and 3.0.1, a path traversal vulnerability in `brut/androlib/res/decoder/ResFileDecoder.java` allows a maliciously crafted APK to write arbitrary files to the filesystem during standard decoding (`apktool d`). This is a security regression introduced in commit e10a045 (PR #4041, December 12, 2025), which removed the `BrutIO.sanitizePath()` call that previously prevented path traversal in resource file output paths. An attacker can embed `../` sequences in the `resources.arsc` Type String Pool to escape the output directory and write files to arbitrary locations, including `~/.ssh/config`, `~/.bashrc`, or Windows Startup folders, escalating to RCE. The fix in version 3.0.2 re-introduces `BrutIO.sanitizePath()` in `ResFileDecoder.java` before file write operations.","status":"published","published":"2026-04-21T02:16:00Z","modified":"2026-10-17T12:58:13.773297442Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"},{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T16:56:16.686388Z"}]}}