Vulnerability in wget (UBUNTU-CVE-2026-58472)

Summary

Vulnerability in wget (UBUNTU-CVE-2026-58472). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 1.15-1ubuntu1.14.04.5+esm2 or later.

Original description

The description as published by the source.

GNU Wget through 1.25.0, fixed in commit dd692d9, contains a heap buffer overflow vulnerability in the html_quote_string() function in src/convert.c that allows a remote attacker to trigger memory corruption by supplying a crafted HTML attribute with a large number of characters requiring entity encoding. A server-supplied HTML attribute causes a signed integer counter to overflow during output size accumulation, resulting in an undersized heap allocation and subsequent heap buffer overflow during the copy phase.

Source: OSV.dev (Open Source Vulnerabilities) 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 UBUNTU-CVE-2026-58472 has been found in wget.
Risk of unauthorized operations or information disclosure.
What to do: upgrade wget to 1.15-1ubuntu1.14.04.5+esm2 or later.
If unsure, ask your IT team or search "wget UBUNTU-CVE-2026-58472" on the vendor's site.

UBUNTU-CVE-2026-58472 (wget)
Attack vector: remote (network-reachable) / unauthenticated
Patched: 1.15-1ubuntu1.14.04.5+esm2 — 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 wget.

📍 Affected scope

Check the vendor advisory for the affected versions of wget.

🔥 Severity

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

🔧 How to fix

Update to 1.15-1ubuntu1.14.04.5+esm2.

🛡️ 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 'wget' . 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
Identify exposure identify
```
grep -r 'wget' . | 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 wget を grep し、稼働しているサービス・バージョンを把握する。
2
Apply patch patch
```
Upgrade wget to 1.15-1ubuntu1.14.04.5+esm2
```
ステージング環境で 1.15-1ubuntu1.14.04.5+esm2 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。
3
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

Ubuntu:Pro:14.04:LTS wget

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.15-1ubuntu1.14.04.5+esm2"}]}]

Ubuntu:Pro:16.04:LTS wget

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17.1-1ubuntu1.5+esm3"}]}]

Ubuntu:Pro:18.04:LTS wget

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.19.4-1ubuntu2.2+esm3"}]}]

Ubuntu:Pro:20.04:LTS wget

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.20.3-1ubuntu2.1+esm2"}]}]

Ubuntu:22.04:LTS wget

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.21.2-2ubuntu1.3"}]}]

Ubuntu:24.04:LTS wget

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.21.4-1ubuntu4.3"}]}]

Ubuntu:25.10 wget

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Ubuntu:26.04:LTS wget

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.25.0-2ubuntu4.2"}]}]

References

advisory ubuntu.com
report ubuntu.com
report cve.org