CVE-2026-45447

🚨 CVE-2026-45447 - Vulnerabilidad Crítica de Use-After-Free en OpenSSL Use-After-Free en el montón enPKCS7verify que permite corrupción de memoria, bloqueos y posible ejecución remota de código. 📖 Resumen Ejecutivo CVE-2026-45447 es una vulnerabilidad crítica en la funcionalidad de verificación...

Johnny-You-Are-Fired

Johnny-You-Are-Fired Artifacts for the USENIX publication | Full paper here Abstract OpenPGP and S/MIME are the two major standards to encrypt and digitally sign emails. Digital signatures are supposed to guarantee authenticity and integrity of messages. In this work we show practical forgery...

AlmaLinux 9.2 [TuxCare] Security Update: thunderbird Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1785560172)

The AlmaLinux 9.2 host has a package installed that is affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1785560172 advisory. - Certificate OCSP revocation status was not checked when verifying S/Mime signatures. Mail signed with a revoked certificate would ...

CentOS Linux 7 [TuxCare] Security Update: openssl11 / openssl11-devel / openssl11-libs / openssl11-static (CENTOS7:CLSA-2026:1786005006)

The CentOS Linux 7 host has packages installed that are affected by a vulnerability as referenced in the TuxCare CENTOS7:CLSA-2026:1786005006 advisory. - Issue summary: A specially crafted PKCS7 or S/MIME signed message could trigger a use-after-free during PKCS7 signature verification. Impact...

Rocky Linux 8 [CIQ] Security Update: thunderbird / thunderbird-debuginfo / thunderbird-debugsource (crlsa-2023_0606)

The Rocky Linux 8 host has packages installed that are affected by a vulnerability as referenced in the CIQ crlsa-20230606 advisory. Mozilla: Revocation status of S/Mime signature certificates was not checked CVE-2023-0430 Tenable has extracted the preceding description block directly from the CI...

Rocky Linux 9 [CIQ] Security Update: thunderbird / thunderbird-debuginfo / thunderbird-debugsource (crlsa-2023_0608)

The Rocky Linux 9 host has packages installed that are affected by a vulnerability as referenced in the CIQ crlsa-20230608 advisory. Mozilla: Revocation status of S/Mime signature certificates was not checked CVE-2023-0430 Tenable has extracted the preceding description block directly from the CI...

CentOS Linux 8 [TuxCare] Security Update: openssl / openssl-devel / openssl-libs / openssl-perl / etc (CENTOS-STREAM8:CLSA-2026:1781175688)

The CentOS Linux 8 host has packages installed that are affected by a vulnerability as referenced in the TuxCare CENTOS- STREAM8:CLSA-2026:1781175688 advisory. - Issue summary: A specially crafted PKCS7 or S/MIME signed message could trigger a use-after-free during PKCS7 signature verification...

CVE-2026-84465

Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, when Zammad checks the digital signature on an incoming S/MIME-signed email, it does not verify that the signing certificate is genuinely trusted, it only checks whether a certificate with a matching name is alrea...

CVE-2026-84465 Zammad: S/MIME signature verification allows forged sender impersonation

Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, when Zammad checks the digital signature on an incoming S/MIME-signed email, it does not verify that the signing certificate is genuinely trusted, it only checks whether a certificate with a matching name is alrea...

CVE-2026-84465 Zammad: S/MIME signature verification allows forged sender impersonation

Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, when Zammad checks the digital signature on an incoming S/MIME-signed email, it does not verify that the signing certificate is genuinely trusted, it only checks whether a certificate with a matching name is alrea...

CVE-2026-84465 Zammad: S/MIME signature verification allows forged sender impersonation

Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, when Zammad checks the digital signature on an incoming S/MIME-signed email, it does not verify that the signing certificate is genuinely trusted, it only checks whether a certificate with a matching name is alrea...

CVE-2026-84465

The open source helpdesk system Zammad is vulnerable to sender impersonation in versions prior to 7.1.2 . The root cause is that the system fails to verify if an S/MIME-signed email's certificate is genuinely trusted; instead, it only checks if a certificate with a matching name exists in the sys...

CVE-2026-84465: Authentication Bypass by Spoofing

Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, when Zammad checks the digital signature on an incoming S/MIME-signed email, it does not verify that the signing certificate is genuinely trusted, it only checks whether a certificate with a matching name is alrea...

openssl: Possible Out of Bounds Read in X509_VERIFY_PARAM_set1_email()

A flaw was found in OpenSSL. When an application uses the X509VERIFYPARAMset1email function to validate a specially crafted S/MIME Secure/Multipurpose Internet Mail Extensions email address, an out-of-bounds read can occur. A remote attacker could exploit this vulnerability by sending a malicious...

Astra Linux – Vulnerability in Thunderbird

The OCSP revocation status of certificates was not checked when verifying S/Mime signatures. Emails signed with revoked certificates would be displayed as having a valid signature. Thunderbird versions from 68 to 102.7.0 were affected by this bug. This vulnerability affects Thunderbird versions...

Astra Linux – Vulnerability in nss, Thunderbird

Versions of NSS Network Security Services prior to 3.73 or 3.68.1 ESR are vulnerable to a heap overflow when handling DER-encoded DSA or RSA-PSS signatures. Applications that use NSS to handle signatures encoded within CMS, S/MIME, PKCS \7, or PKCS \12 are likely to be affected. Applications that...

Astra Linux – Vulnerability in Thunderbird

Thunderbird versions prior to 91.3.0 are vulnerable to a heap overflow vulnerability described in CVE-2021-43527 when processing S/MIME messages. Thunderbird versions 91.3.0 and later will not call the vulnerable code when processing S/MIME messages that contain certificates with DER-encoded DSA ...

Astra Linux – Vulnerability in Thunderbird

The OCSP revocation status of recipient certificates was not checked when sending S/MIME encrypted emails. As a result, revoked certificates were accepted. This bug affected Thunderbird versions from 68 to 102.9.1. This vulnerability affects Thunderbird versions earlier than 102.10...

Astra Linux – Vulnerability in Thunderbird

The signature of a digitally signed S/MIME email message may optionally specify the signature creation date and time. If this information is present, Thunderbird does not compare the signature creation date with the message date and time, and displays a valid signature even if there is a mismatch...

openssl: Heap Use-After-Free in OpenSSL PKCS7_verify()

A flaw was found in OpenSSL. When processing a specially crafted PKCS7 or S/MIME Secure/Multipurpose Internet Mail Extensions signed message, a heap use-after-free vulnerability in the PKCS7verify function can be triggered. This occurs if the SignedData digestAlgorithms field is present as an emp...