CVE-2026-26247 Gitea OAuth2 PKCE S256 challenges are not enforced during token exchange

Gitea versions before 1.25.5 do not persist the OAuth2 PKCE S256 challenge method correctly during authorization, allowing token exchange without the expected verifier check...

PT-2026-55597

Name of the Vulnerable Software and Affected Versions Gitea versions prior to 1.25.5 Description The software fails to correctly persist the OAuth2 PKCE S256 challenge method during the authorization process. This flaw allows for token exchange without the required verifier check. PKCE Proof Key...

CVE-2026-44040

UltraVNC through 1.8.2.2 uses a cryptographically weak pseudo-random number generator to produce VNC authentication challenge bytes. In rfb/vncauth.c:119-129, the vncRandomBytes function seeds libc rand with time0 + getpid + rand and generates a 16-byte challenge. The combined seed space is...

CVE-2026-44040 UltraVNC vncauth.c uses time-seeded libc rand() to generate VNC authentication challenge bytes

UltraVNC through 1.8.2.2 uses a cryptographically weak pseudo-random number generator to produce VNC authentication challenge bytes. In rfb/vncauth.c:119-129, the vncRandomBytes function seeds libc rand with time0 + getpid + rand and generates a 16-byte challenge. The combined seed space is...

CVE-2026-44040 UltraVNC vncauth.c uses time-seeded libc rand() to generate VNC authentication challenge bytes

UltraVNC through 1.8.2.2 uses a cryptographically weak pseudo-random number generator to produce VNC authentication challenge bytes. In rfb/vncauth.c:119-129, the vncRandomBytes function seeds libc rand with time0 + getpid + rand and generates a 16-byte challenge. The combined seed space is...

EUVD-2026-40879

UltraVNC through 1.8.2.2 uses a cryptographically weak pseudo-random number generator to produce VNC authentication challenge bytes. In rfb/vncauth.c:119-129, the vncRandomBytes function seeds libc rand with time0 + getpid + rand and generates a 16-byte challenge. The combined seed space is...

PT-2026-54477

Name of the Vulnerable Software and Affected Versions UltraVNC versions prior to 1.8.2.3 Description The software uses a cryptographically weak pseudo-random number generator to produce VNC authentication challenge bytes. Specifically, the vncRandomBytes function seeds libc rand using a combinati...

CVE-2026-56766

A flaw was found in Hydra. A malicious server can exploit a stack buffer overflow vulnerability in the NTLM authentication modules by sending a specially crafted NTLM Type-2 challenge. This can lead to an overflow of a stack buffer, potentially enabling remote code execution on systems that lack...

SUSE-SU-2026:2648-1 Security update for openssl-3

This update for openssl-3 fixes the following issues - CVE-2026-7383: Possible Heap Buffer Overflow in ASN.1 Multibyte String Conversion bsc1266340. - CVE-2026-9076: Out-of-Bounds Read in CMS Password-Based Decryption bsc1266341. - CVE-2026-34180: Heap Buffer Over-read in ASN.1 Content Parsing...

Fedora 44 : nginx / nginx-mod-brotli / nginx-mod-fancyindex / etc (2026-b8e751787c)

The remote Fedora 44 host has packages installed that are affected by multiple vulnerabilities as referenced in the FEDORA-2026-b8e751787c advisory. nginx-mod-brotli: - Rebuild for 1.30.3 nginx-mod-fancyindex: - Rebuild for 1.30.3 nginx-mod-vts: - Rebuild for 1.30.3 nginx-mod-modsecurity: - Rebui...

GO-2026-5262 HashiCorp Vault has Server-Side Request Forgery in ACME Challenge Validation via Attacker-Controlled DNS in github.com/hashicorp/vault

HashiCorp Vault has Server-Side Request Forgery in ACME Challenge Validation via Attacker-Controlled DNS in github.com/hashicorp/vault...

CVE-2026-56766 Hydra - Stack Buffer Overflow in NTLM Authentication Handler

Hydra through 9.7, fixed in commit 9cc84c2, contains a stack buffer overflow in NTLM authentication across SMTP, POP3, IMAP, NNTP, HTTP, HTTP-Proxy, and HTTP-Proxy-Urlenum modules when processing malicious NTLM Type-2 challenges. A malicious server can send a crafted NTLM Type-2 challenge with an...

EUVD-2026-39515

Hydra through 9.7, fixed in commit 9cc84c2, contains a stack buffer overflow in NTLM authentication across SMTP, POP3, IMAP, NNTP, HTTP, HTTP-Proxy, and HTTP-Proxy-Urlenum modules when processing malicious NTLM Type-2 challenges. A malicious server can send a crafted NTLM Type-2 challenge with an...

PT-2026-52540

Name of the Vulnerable Software and Affected Versions Hydra versions prior to 9.7 commit 9cc84c2 Description A stack buffer overflow exists in the NTLM authentication process across the SMTP, POP3, IMAP, NNTP, HTTP, HTTP-Proxy, and HTTP-Proxy-Urlenum modules. The issue occurs when the software...

CVE-2026-56968

GNU SASL before 2.2.4 lacks sanitization of a short challenge in gsaslntlmclientstep in the NTLM client, which could result in memory disclosure via a crafted server...

EUVD-2026-38512

GNU SASL before 2.2.4 lacks sanitization of a short challenge in gsaslntlmclientstep in the NTLM client, which could result in memory disclosure via a crafted server...

CVE-2026-56968

GNU SASL before 2.2.4 lacks sanitization of a short challenge in gsaslntlmclientstep in the NTLM client, which could result in memory disclosure via a crafted server...

Fedora 45 : nginx / nginx-mod-brotli / nginx-mod-fancyindex / etc (2026-e212182e6e)

The remote Fedora 45 host has packages installed that are affected by multiple vulnerabilities as referenced in the FEDORA-2026-e212182e6e advisory. nginx-mod-brotli: - Rebuild for 1.30.3 nginx-mod-fancyindex: - Rebuild for 1.30.3 nginx-mod-modsecurity: - Rebuild for 1.30.3 nginx-mod-headers-more...

CVE-2026-48991 XianYuLauncher: Legacy Microsoft account OAuth sign-in flow lacks PKCE and state validation

XianYuLauncher is a Minecraft Java Edition launcher. In versions prior to 1.5.5, sensitive authentication artifacts could be exposed during a user-initiated login under certain local attack conditions. Affected versions relied on a fixed localhost redirect URI without PKCE or state validation...

CVE-2026-10303

In ServerCo getssl version 2.49 and prior, the ACME challenge token returned to the client was not strictly validated against RFC 8555 before being used in challenge-file handling, allowing a maliciously crafted token to influence local path/filename usage during validation. An attacker who can...