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CVE-2026-48979
high
CVSS 7.5
Vulnerability in php-standard-library/h2 (CVE-2026-48979)
Summary
vulnerability in php-standard-library/h2 (CVE-2026-48979). Data can be tampered with by attackers. Exploitable via ``StreamException``. Mitigation: upgrade to `6.2.1` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-48979** has been found in php-standard-library/h2.
Attackers can target a specific entry point like ``StreamException`` over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 7.5/10.
What to do: upgrade php-standard-library/h2 to **6.2.1** or later.
If unsure, ask your IT team or search "php-standard-library/h2 CVE-2026-48979" on the vendor's site.
CVE-2026-48979 (php-standard-library/h2) — CWE-444 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: `StreamException`
Patched: `6.2.1` — apply immediately
Workaround: None at the protocol layer.
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-444) exists in php-standard-library/h2. Attackers reach the vulnerable code path via ``StreamException`` without authentication.
📍 Affected scope
php-standard-library/h2 — . Attack surface: `StreamException`.
🔥 Severity
Severity: High (CVSS 7.5/10). Data can be tampered with by attackers
🔧 How to fix
Update to **6.2.1**.
🛡️ Workaround
Workaround: None at the protocol layer.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'php-standard-library/h2' .` 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 'php-standard-library/h2' . | 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 `php-standard-library/h2` 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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5Apply temporary workaround mitigate
None at the protocol layer.パッチが適用されるまでの応急処置として、None at the protocol layer. を実施。回避策の副作用 (機能低下) を確認した上で。
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6Apply patch patch
Upgrade php-standard-library/h2 to 6.2.1ステージング環境で 6.2.1 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。
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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
composer
php-standard-library/h2
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.2.1"}]}]
composer
php-standard-library/php-standard-library
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.2.1"}]}]
References
- web https://github.com/php-standard-library/php-standard-library/releases/tag/6.1.2
- web https://github.com/php-standard-library/php-standard-library/releases/tag/6.2.1
- web https://github.com/php-standard-library/php-standard-library/security/advisories/GHSA-pw9p-jvrm-f7rm
- web https://nvd.nist.gov/vuln/detail/CVE-2026-48979
- web https://github.com/advisories/GHSA-pw9p-jvrm-f7rm