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CVE-2025-48994
Vulnerability in signxml (CVE-2025-48994)
Summary
vulnerability in signxml (CVE-2025-48994). Risk of unauthorized operations or information disclosure. Exploitable via ``hmac_key``. Mitigation: upgrade to `4.0.4` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2025-48994** has been found in signxml.
Attackers can target a specific entry point like ``hmac_key`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade signxml to **4.0.4** or later.
If unsure, ask your IT team or search "signxml CVE-2025-48994" on the vendor's site.
CVE-2025-48994 (signxml) — CWE-303 /
Attack surface: `hmac_key`
Patched: `4.0.4` — 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** (CWE-303) exists in signxml. Attackers reach the vulnerable code path via ``hmac_key`` without authentication.
📍 Affected scope
signxml — . Attack surface: `hmac_key`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **4.0.4**.
🛡️ 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 'signxml' .` 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
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1Identify exposure identify
grep -r 'signxml' . | 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 `signxml` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply patch patch
Upgrade signxml to 4.0.4ステージング環境で 4.0.4 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。
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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
PyPI
signxml
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.0.4"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2025-48994
- advisory https://github.com/advisories/GHSA-6vx8-pcwv-xhf4
- package https://github.com/XML-Security/signxml
- package https://pypi.org/project/signxml
- web https://github.com/XML-Security/signxml/security/advisories/GHSA-6vx8-pcwv-xhf4
- web https://github.com/XML-Security/signxml/commit/e3c0c2b82a3329a65d917830657649c98b8c7600