Home/CVE/xz is a compression and decompression library focusing on the xz format completely written in Go. The function readUvari
CVE

CVE-2021-29482

xz is a compression and decompression library focusing on the xz format completely written in Go. The function readUvari

xz 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. The problem has been fixed in release v0.5.8.

As a workaround users can limit the size of the compressed file input to a reasonable size for their use case. The standard library had recently the same issue and got the CVE-2020-16845 allocated.

HIGH · CVSS 7.5 EPSS 0.00433
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
▤

Affected Products & Versions

1
xz project xz< 0.5.8
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Go github.com/ulikunitz/xz HIGH fixed in 0.5.8
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD28 Apr 2021 · 07:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

4
rhsaRHSA-2022:1276Important
rhsaRHSA-2022:0687Low
rhsaRHSA-2022:2183Moderate
rhsaRHSA-2021:2920Moderate
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/ulikunitz/xz/commit/69c6093c7b2397b923acf82cb378f55ab2652b9bPatchThird Party Advisory
https://github.com/ulikunitz/xz/security/advisories/GHSA-25xm-hr59-7c27Third Party Advisory
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