Out-of-Bounds Read in Amazon Ion-C (CVE-2025-12829)
Summary
Vulnerability in Amazon Ion-C (CVE-2025-12829). Confidential information can be exposed externally.
Original description
The description as published by the source.
Bulletin ID: AWS-2025-027 Scope: Amazon Content Type: Important (requires attention) Publication Date: 2025/11/7 10:15 AM PDT Description: Amazon's Ion-C is a library for the C language that is used to read and write Amazon Ion data. We Identified CVE-2025-12829, which describes an uninitialized stack read issue in Ion-C versions < v1.1.4 that may allow a threat actor to craft data and serialize it to Ion text in such a way that sensitive data in memory could be exposed through UTF-8 escape sequences. Impacted versions: < v1.1.4
Source: AWS Security Bulletins NVD
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-2025-12829 has been found in Amazon Ion-C.
Confidential information can be exposed externally. CVSS score: 6.2/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Amazon Ion-C CVE-2025-12829" on the vendor's site.
CVE-2025-12829 (Amazon Ion-C) — CWE-125 / CVSS v3 6.2
Attack vector: local / unauthenticated / no user interaction
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.
Out-of-bounds read (CWE-125) exists in Amazon Ion-C.
Check the vendor advisory for the affected versions of Amazon Ion-C.
Severity: Medium (CVSS 6.2/10). Confidential information can be exposed externally.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Ion-C' . 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
-
1Identify exposure identify
grep -r 'Ion-C' . | 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
Ion-Cを grep し、稼働しているサービス・バージョンを把握する。 -
2Post-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。
References
- AWS aws.amazon.com
- web aws.amazon.com
- web github.com
- web github.com