Information Disclosure in buffa (CVE-2026-55406)
Summary
Vulnerability in buffa (CVE-2026-55406). Risk of unauthorized operations or information disclosure. Exploitable via buffa. Mitigation: upgrade to 0.7.0 or later.
Original description
The description as published by the source.
A soundness bug in buffa's OwnedView allowed safe Rust code to trigger a use-after-free. The OwnedView::decode constructor transmuted a borrowed slice to &'static [u8], and the Deref implementation exposed the promoted 'static lifetime on borrowed view fields (such as &'static str and &'static [u8]) to callers. Because these references appeared to be 'static, the borrow checker permitted them to outlive the OwnedView; once the OwnedView was dropped and its backing buffer freed, those references became dangling, enabling memory corruption, information disclosure of freed heap contents, and cross-thread misuse — all without any unsafe code in the calling application. Users are advised to update to the latest patched version of buffa.
Thank you to hackerone.com/suul for reporting this issue.
Source: NIST National Vulnerability Database NVD GitHub Advisory
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-2026-55406 has been found in buffa.
Attackers can target a specific entry point like buffa over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade buffa to 0.7.0 or later.
If unsure, ask your IT team or search "buffa CVE-2026-55406" on the vendor's site.
CVE-2026-55406 (buffa) — CWE-200
Attack surface: buffa / Deref / OwnedView / unsafe
Patched: 0.7.0 — 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.
Information disclosure (CWE-200) exists in buffa. Attackers reach the vulnerable code path via buffa.
Check the vendor advisory for the affected versions of buffa. Attack surface: buffa / Deref / OwnedView / unsafe.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 0.7.0.
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 'buffa' . 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
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1Identify exposure identify
grep -r 'buffa' . | 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
buffaを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade buffa to 0.7.0ステージング環境で 0.7.0 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。
-
3Post-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
References
- web github.com
- web github.com
- web github.com
- web github.com
- web nvd.nist.gov
- web github.com