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CVE-2021-29482

Vulnerability in github.com/ulikunitz/xz (CVE-2021-29482)

Summary

Vulnerability in github.com/ulikunitz/xz (CVE-2021-29482). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 0.5.8 or later.

Original description

The description as published by the source.

Impact

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.

Patches

The problem has been fixed in release v0.5.8.

Workarounds

Limit the size of the compressed file input to a reasonable size for your use case.

References

The standard library had recently the same issue and got the CVE-2020-16845 allocated.

For more information

If you have any questions or comments about this advisory:

  • Open an issue in xz.

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2021-29482 has been found in github.com/ulikunitz/xz.
Risk of unauthorized operations or information disclosure.
What to do: upgrade github.com/ulikunitz/xz to 0.5.8 or later.
If unsure, ask your IT team or search "github.com/ulikunitz/xz CVE-2021-29482" on the vendor's site.

CVE-2021-29482 (github.com/ulikunitz/xz) — CWE-835
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 0.5.8 — apply immediately
Workaround: Limit the size of the compressed file input to a reasonable size for your use case.
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-835) exists in github.com/ulikunitz/xz.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/ulikunitz/xz.

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 0.5.8.

🛡️ Workaround

Workaround: Limit the size of the compressed file input to a reasonable size for your use case.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'github.com/ulikunitz/xz' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'github.com/ulikunitz/xz' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で github.com/ulikunitz/xz を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply temporary workaround mitigate 
    Limit the size of the compressed file input to a reasonable size for your use case.

    パッチが適用されるまでの応急処置として、Limit the size of the compressed file input to a reasonable size for your use case. を実施。回避策の副作用 (機能低下) を確認した上で。

  3. 3
    Apply patch patch 
    Upgrade github.com/ulikunitz/xz to 0.5.8

    ステージング環境で 0.5.8 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  4. 4
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Go github.com/ulikunitz/xz
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.5.8"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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