GHSA-34xg-wgjx-8xph · 深刻度： medium · エコシステム： composer — guzzlehttp/psr7 has Host Confusion via Authority Reinterpretation
guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Versions prior to 2.10.2 contain improper Host header validation when parsing raw HTTP request messages and when deriving a server request URI from server variables. An attacker can provide a malformed Host header containing URI authority delimiters, such as `[email protected]`. When the Host value is used to construct a URI, the malformed value can be reinterpreted as URI userinfo and host. This can cause the PSR-7 request URI host to differ from the original Host header value. Applications are affected if they parse attacker-controlled raw HTTP requests with `GuzzleHttp\Psr7\Message::parseRequest()` or the legacy 1.x `GuzzleHttp\Psr7\parse_request()` function, or if they build server requests from attacker-controlled server variables, then rely on the resulting URI host for routing, allow-list checks, or forwarding decisions. In affected forwarding or gateway scenarios, this may cause requests or credentials to be sent to an unintended host. The issue is patched in `2.10.2`. `1.x` is end-of-life and will not receive a patch. Some workarounds are available. Validate the `Host` header as `uri-host [ ":" port ]` before calling `Message::parseRequest()` or legacy `parse_request()` on untrusted HTTP request data, or before deriving routing and forwarding decisions from a parsed request URI. Reject Host values containing userinfo, path, query, or fragment delimiters.
総合評価: CVE-2026-48998 は低リスク（24.4/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.20%、10 パーセンタイル） 推奨対応: 悪用情報と EPSS の推移を監視し、必要に応じて優先度を見直してください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-23 | 0.31% | 0.20% | -0.11% |
| 2 | 2026-06-15 | 0.04% | 0.31% | +0.27% |
| 3 | 2026-06-12 | — | 0.04% | — |
EPSS の全履歴 （全 3 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 5.3 | 3.1 | MEDIUM |
|
3.9 | 1.4 | [email protected] |
GHSA-34xg-wgjx-8xph · 深刻度： medium · エコシステム： composer — guzzlehttp/psr7 has Host Confusion via Authority Reinterpretation
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2026-48998 not yet assigned priority: Debian including 1 source packages (php-guzzlehttp-psr7), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 3, resolved 2. | https://security-tracker.debian.org/tracker/CVE-2026-48998 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2026-48998 |
ubuntu
|
medium | CVE-2026-48998 medium priority: Ubuntu including 1 source packages (php-guzzlehttp-psr7), 6 status rows across 6 suites (focal, jammy, noble, questing, resolute, upstream): needs-triage 6. | https://ubuntu.com/security/CVE-2026-48998 |
| URL | タグ |
|---|---|
| https://github.com/guzzle/psr7/security/advisories/GHSA-34xg-wgjx-8xph | Mitigation Vendor Advisory |