{"id":"CVE-2021-29482","aliases":["GHSA-25xm-hr59-7c27","GO-2020-0016"],"title":"github.com/ulikunitz/xz fixes readUvarint Denial of Service (DoS)","summary":"github.com/ulikunitz/xz fixes readUvarint Denial of Service (DoS)","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","vendor":"ulikunitz","product":"github.com/ulikunitz/xz","ecosystem":"go","affected":["github.com/ulikunitz/xz < 0.5.8"],"patched":["github.com/ulikunitz/xz 0.5.8"],"published":"2021-05-25","updated":"2026-07-08","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-25xm-hr59-7c27","references":[{"url":"https://github.com/ulikunitz/xz/security/advisories/GHSA-25xm-hr59-7c27"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29482"},{"url":"https://github.com/ulikunitz/xz/issues/35"},{"url":"https://github.com/ulikunitz/xz/commit/69c6093c7b2397b923acf82cb378f55ab2652b9b"},{"url":"https://pkg.go.dev/vuln/GO-2020-0016"}],"tags":["osv","go"],"epss":0.01438,"epssPercentile":0.71563,"ingestedAt":"2026-07-09T18:56:35.425Z","slug":"CVE-2021-29482","body":"## Overview\n\n### Impact\n\nxz is a compression and decompression library focusing on the xz format completely written in Go. The function readUvarint used to read the xz container format may not terminate a loop provide malicous input.\n\n### Patches\n\nThe problem has been fixed in release v0.5.8.\n\n### Workarounds\n\nLimit the size of the compressed file input to a reasonable size for your use case.\n\n### References\n\nThe standard library had recently the same issue and got the [CVE-2020-16845](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-16845) allocated.\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [xz](https://github.com/ulikunitz/xz/issues).\n\n## Affected packages\n\n- `github.com/ulikunitz/xz < 0.5.8`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `github.com/ulikunitz/xz 0.5.8`","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.3,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}