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UBUNTU-CVE-2026-33056
Vulnerability in rustc (UBUNTU-CVE-2026-33056)
Summary
vulnerability in rustc (UBUNTU-CVE-2026-33056). Data can be tampered with by attackers. Mitigation: upgrade to `0.4.37-3ubuntu0.1` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **UBUNTU-CVE-2026-33056** has been found in rustc.
Data can be tampered with by attackers. CVSS score: ?/10.
What to do: upgrade rustc to **0.4.37-3ubuntu0.1** or later.
If unsure, ask your IT team or search "rustc UBUNTU-CVE-2026-33056" on the vendor's site.
UBUNTU-CVE-2026-33056 (rustc) —
Attack vector: remote (network-reachable) / unauthenticated
Patched: `0.4.37-3ubuntu0.1` — apply immediately
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** (unclassified) exists in rustc.
📍 Affected scope
rustc — .
🔥 Severity
Severity: ?. Data can be tampered with by attackers
🔧 How to fix
Update to **0.4.37-3ubuntu0.1**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'rustc' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'rustc' . | 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 `rustc` を grep し、稼働しているサービス・バージョンを把握する。
-
6Apply patch patch
Upgrade rustc to 0.4.37-3ubuntu0.1ステージング環境で 0.4.37-3ubuntu0.1 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と、Step 3 で見つけた異常検知の続報チェックを含めること。
-
7Post-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 Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
Ubuntu:Pro:14.04:LTS
rustc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS
cargo
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:16.04:LTS
rustc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:18.04:LTS
cargo
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:18.04:LTS
rustc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:20.04:LTS
cargo
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:20.04:LTS
rust-tar
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:20.04:LTS
rustc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:20.04:LTS
rustc-1.76
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:20.04:LTS
rustc-1.77
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:20.04:LTS
rustc-1.78
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:20.04:LTS
rustc-1.79
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:20.04:LTS
rustc-1.80
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:22.04:LTS
rust-tar
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.37-3ubuntu0.1"}]}]
Ubuntu:22.04:LTS
rustc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.75.0+dfsg0ubuntu1~bpo0-0ubuntu0.22.04.1"}]}]
Ubuntu:22.04:LTS
rustc-1.62
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.62.1+dfsg1-1ubuntu0.22.04.3"}]}]
Ubuntu:22.04:LTS
rustc-1.76
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.76.0+dfsg0ubuntu1~bpo0-0ubuntu0.22.04.1"}]}]
Ubuntu:22.04:LTS
rustc-1.77
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.77.2+dfsg1ubuntu1~bpo0-0ubuntu0.22.04.1"}]}]
Ubuntu:22.04:LTS
rustc-1.78
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.78.0+dfsg1ubuntu1~bpo0-0ubuntu0.22.04.1"}]}]
Ubuntu:22.04:LTS
rustc-1.79
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.79.0+dfsg1ubuntu1~bpo0-0ubuntu0.22.04.1"}]}]
Ubuntu:22.04:LTS
rustc-1.80
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.80.1+dfsg0ubuntu1~bpo0-0ubuntu0.22.04.1"}]}]
Ubuntu:22.04:LTS
rustc-1.81
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.81.0+dfsg0ubuntu0-0ubuntu0.22.04.1"}]}]
Ubuntu:22.04:LTS
rustc-1.82
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.82.0+dfsg0ubuntu0~jammy-0ubuntu0.22.04.1"}]}]
Ubuntu:22.04:LTS
rustc-1.83
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.83.0+dfsg0ubuntu2~bpo2-0ubuntu2.22.04.1"}]}]
Ubuntu:22.04:LTS
rustc-1.84
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.84.1+dfsg0ubuntu1~bpo10-0ubuntu4.22.04.1"}]}]
Ubuntu:22.04:LTS
rustc-1.85
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.85.1+dfsg0ubuntu2~bpo0-0ubuntu1.22.04.1"}]}]
Ubuntu:22.04:LTS
rustc-1.89
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.89.0+dfsg~24.04-0ubuntu0.22.04.2"}]}]
Ubuntu:22.04:LTS
rustc-1.91
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.91.1+dfsg~22.04-0ubuntu0.22.04.3"}]}]
Ubuntu:Pro:22.04:LTS
cargo
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS
rust-async-tar
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS
rust-cargo-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS
rust-tar
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.40-1ubuntu0.1"}]}]
Ubuntu:24.04:LTS
rustc
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.75.0+dfsg0ubuntu1-0ubuntu7.4"}]}]
Ubuntu:24.04:LTS
rustc-1.74
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.74.1+dfsg0ubuntu1-0ubuntu15"}]}]
Ubuntu:24.04:LTS
rustc-1.76
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.76.0+dfsg0ubuntu1-0ubuntu0.24.04.2"}]}]
Ubuntu:24.04:LTS
rustc-1.77
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.77.2+dfsg1ubuntu1-0ubuntu0.24.04.1"}]}]
Ubuntu:24.04:LTS
rustc-1.78
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.78.0+dfsg1ubuntu1-0ubuntu0.24.04.2"}]}]
Ubuntu:24.04:LTS
rustc-1.79
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.79.0+dfsg1ubuntu1-0ubuntu0.24.04.1"}]}]
Ubuntu:24.04:LTS
rustc-1.80
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.80.1+dfsg0ubuntu1-0ubuntu0.24.04.01"}]}]
Ubuntu:24.04:LTS
rustc-1.81
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.81.0+dfsg0ubuntu1-0ubuntu0.24.04.1"}]}]
Ubuntu:24.04:LTS
rustc-1.82
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.82.0+dfsg0ubuntu0-0ubuntu0.24.04.1"}]}]
Ubuntu:24.04:LTS
rustc-1.83
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.83.0+dfsg0ubuntu1~bpo2-0ubuntu0.24.04.1"}]}]
Ubuntu:24.04:LTS
rustc-1.84
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.84.1+dfsg0ubuntu1~bpo2-0ubuntu2.24.04.1"}]}]
Ubuntu:24.04:LTS
rustc-1.85
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.85.1+dfsg0ubuntu2~bpo0-0ubuntu0.24.04.2"}]}]
Ubuntu:24.04:LTS
rustc-1.89
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.89.0+dfsg~24.04-0ubuntu0.24.04.2"}]}]
Ubuntu:24.04:LTS
rustc-1.91
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.91.1+dfsg~24.04-0ubuntu0.24.04.2"}]}]
Ubuntu:25.10
rust-astral-tokio-tar
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10
rust-async-tar
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:25.10
rust-cargo-c
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.10.11-1ubuntu1.1"}]}]
Ubuntu:25.10
rust-tar
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.43-4ubuntu0.1"}]}]
Ubuntu:25.10
rustc-1.85
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.85.1+dfsg0ubuntu2-0ubuntu1.25.04.1"}]}]
Ubuntu:25.10
rustc-1.88
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.88.0+dfsg0ubuntu1-0ubuntu2"}]}]
Ubuntu:26.04:LTS
rust-astral-tokio-tar
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
References
- advisory https://ubuntu.com/security/notices/USN-8139-1
- advisory https://ubuntu.com/security/notices/USN-8138-1
- advisory https://ubuntu.com/security/notices/USN-8168-1
- report https://ubuntu.com/security/CVE-2026-33056
- report https://www.cve.org/CVERecord?id=CVE-2026-33056
- report https://github.com/alexcrichton/tar-rs/commit/17b1fd84e632071cb8eef9d3709bf347bd266446
- report https://github.com/alexcrichton/tar-rs/security/advisories/GHSA-j4xf-2g29-59ph