GHSA-6fmj-jmjq-qcmg · 深刻度： medium — Issue summary: When the X509_VERIFY_PARAM_set1_email is called by an application to validate a...
Issue summary: When the X509_VERIFY_PARAM_set1_email is called by an application to validate a crafted e-mail address, such as during S/MIME message validation, an out of bounds read can happen. Impact summary: This out of bounds read will not directly exfiltrate the data read to the attacker so the most likely result is a crash and a Denial of Service. An internal helper function called from X509_VERIFY_PARAM_[set|add]_email() used a wrong length when validating the local part of an email address. This could cause the 64 octet limit on the local part of an email address to be not enforced, or cause an out of bound read and potentially a crash. The bug is reachable via S-MIME validation with a crafted From: address supplied in an email message that can potentially cause a crash. No FIPS modules are affected by this issue as the affected code is outside the OpenSSL FIPS module boundary.
総合評価: CVE-2026-42771 は低リスク（26.8/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.16%、5 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 | 2026-06-15 | 0.01% | 0.16% | +0.15% |
| 2 | 2026-06-10 | — | 0.01% | — |
EPSS の全履歴 （全 2 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 |
|---|---|---|---|---|---|---|
| 6.2 | 3.1 | MEDIUM |
|
2.5 | 3.6 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
GHSA-6fmj-jmjq-qcmg · 深刻度： medium — Issue summary: When the X509_VERIFY_PARAM_set1_email is called by an application to validate a...
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
unimportant | CVE-2026-42771 unimportant priority: Debian including 1 source packages (openssl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2026-42771 |
ubuntu
|
low | CVE-2026-42771 low priority: Ubuntu including 5 source packages (edk2, nodejs, openssl, openssl-fips, openssl1.0), 35 status rows across 9 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream, xenial): not-affected 23, DNE 6, needs-triage 5, needed 1. | https://ubuntu.com/security/CVE-2026-42771 |