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CVE-2026-87876

Cups: openprinting cups: remaining case-insensitive username matching in scheduler side paths (cve-2026-27447 follow-up)

Two case-insensitive comparisons on request-derived usernames outside the main authorization path in CUPS's scheduler (printer ACL validation and private-attribute filtering) could allow bypass of username-based access controls in certain configurations.

CVSS 3.1 · 3 Low EPSS < 1% KEV · Not listed
Vendors
Openprinting Redhat
Products
Cups Enterprise Linux Hardened Images and 4 more
CVE-2026-59849

Libssh: libssh: denial of service via automatic certificate authentication loop

A flaw was found in libssh. Logic errors in automatic certificate-based public key authentication can cause libssh clients to loop indefinitely when configured certificates are missing or repeatedly rejected by a server, leading to denial of service.

CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Enterprise Linux For Els and 9 more
CVE-2026-59842

Libssh: libssh: information disclosure via short gssapi curve25519 public key

A flaw was found in libssh. During server-side GSSAPI key exchange, a client-supplied Curve25519 public key shorter than the expected length is copied without proper length validation, leading to an out-of-bounds heap read. This could allow a remote unauthenticated attacker to disclose small amounts of server memory.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Enterprise Linux For Els and 9 more
CVE-2026-55654

Openssh: heap out-of-bounds read in red hat enterprise linux versions of openssh gssapi indicator cleanup due to missing null sentinel termination

A flaw was found in OpenSSH. This vulnerability, a heap out-of-bounds read, occurs during the cleanup of GSSAPI (Generic Security Service Application Programming Interface) indicators when a trailing NULL termination is missing in the auth-indicators array. A remote attacker, under specific configurations involving GSSAPI authentication and a Kerberos environment, could exploit this to cause the SSH authentication path to crash or abort. This leads to a denial of service (DoS), impacting the availability of the SSH service.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Vendors
Openbsd Openssh Redhat
Products
Openssh Openssh Enterprise Linux and 6 more
CVE-2026-5419

Gnutls: gnutls: information disclosure via timing side-channel in pkcs#7 padding removal

A flaw was found in gnutls. The PKCS#7 padding check, performed during decryption, was not constant-time. This timing side-channel could allow a remote attacker to potentially leak sensitive information about the padding bytes through observable timing differences. This vulnerability is a form of information disclosure.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Vendors
Gnu Redhat
Products
Gnutls Cert Manager Discovery and 11 more
CVE-2026-3832

Gnutls: gnutls: security bypass allows acceptance of revoked server certificates via crafted ocsp response

A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted Online Certificate Status Protocol (OCSP) response during a TLS handshake. Due to a logic error in how gnutls processes multi-record OCSP responses, a client with OCSP verification enabled may incorrectly accept a revoked server certificate, potentially leading to a compromise of trust.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Vendors
Gnu Redhat
Products
Gnutls Cert Manager Discovery and 8 more
CVE-2026-44605

Rpm: heap buffer overflow in ndb slot table parsing

A flaw was found in the RPM Package Manager (RPM). A local user could be affected by a heap buffer overflow vulnerability when processing a specially crafted NDB database file. This issue arises from an error in how RPM handles certain calculations during file parsing, leading to an incorrect memory allocation. An attacker could leverage this to cause a denial of service, making the system unavailable.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
Enterprise Linux Hardened Images Hummingbird and 2 more
CVE-2026-3184

Util-linux: util-linux: access control bypass due to improper hostname canonicalization

A flaw was found in util-linux. Improper hostname canonicalization in the `login(1)` utility, when invoked with the `-h` option, can modify the supplied remote hostname before setting `PAM_RHOST`. A remote attacker could exploit this by providing a specially crafted hostname, potentially bypassing host-based Pluggable Authentication Modules (PAM) access control rules that rely on fully qualified domain names. This could lead to unauthorized access.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Vendors
Kernel Linux Redhat
Products
Util-linux Util-linux Enterprise Linux and 4 more
CVE-2026-18839

Popt-devel: popt-static: size_t underflow in singleoptionhelp

An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.

CVSS 3.1 · 2.2 Low EPSS < 1% KEV · Not listed
Vendors
Popt-devel Redhat
Products
Popt-static Enterprise Linux Hardened Images and 5 more
CVE-2026-18743

Popt-devel: popt-static: short realloc in poptconfigfiletostring

A flaw was found in popt. This vulnerability allows an attacker to provide specially crafted configuration content to a host, which, when loaded, can lead to a small memory corruption issue. This occurs because of an error in how the `poptConfigFileToString` function reallocates memory for buffers. Successful exploitation could result in heap metadata corruption, potentially causing the affected process to become unavailable (denial of service).

CVSS 3.1 · 2.5 Low EPSS < 1% KEV · Not listed
Vendors
Redhat Rpm-software-management
Products
Enterprise Linux Hardened Images Hummingbird and 5 more
CVE-2026-17591

Libarchive: libarchive: use-after-free via aliased mac metadata copy

A flaw was found in libarchive. An attacker can cause a Denial of Service (DoS) or potential information disclosure due to a use-after-free vulnerability, which occurs when a program reads memory that has already been released. This issue arises when the archive_entry_copy_mac_metadata() function deallocates an internal buffer before completing a data copy. An attacker who can supply input to an application utilizing this function can trigger the flaw to crash the application or read uninitialized memory data.

CVSS 3.1 · 3.6 Low EPSS < 1% KEV · Not listed
Vendors
Libarchive Red Hat Redhat
Products
Libarchive Enterprise Linux Enterprise Linux and 4 more
CVE-2026-16517

Libarchive: libarchive: signed integer overflow in archive_write_zip_header

A signed integer overflow vulnerability was found in libarchive's ZIP writer. In the archive_write_zip_header function in archive_write_set_format_zip.c, when ZIP encryption is enabled and the entry file size is close to INT64_MAX, the addition of the encryption overhead to the entry size overflows int64_t, resulting in undefined behavior. This could lead to incorrect Zip64 extension decisions or potential memory corruption.

CVSS 3.1 · 2.9 Low EPSS < 1% KEV · Not listed
Vendors
Libarchive Redhat
Products
Libarchive Enterprise Linux Hardened Images and 4 more
CVE-2026-0992

Libxml2: libxml2: denial of service via crafted xml catalogs

A flaw was found in the libxml2 library. This uncontrolled resource consumption vulnerability occurs when processing XML catalogs that contain repeated <nextCatalog> elements pointing to the same downstream catalog. A remote attacker can exploit this by supplying crafted catalogs, causing the parser to redundantly traverse catalog chains. This leads to excessive CPU consumption and degrades application availability, resulting in a denial-of-service condition.

CVSS 3.1 · 2.9 Low EPSS < 1% KEV · Not listed
Vendors
Ibm Redhat Xmlsoft
Products
Aix Vios Enterprise Linux and 8 more
CVE-2026-0989

Libxml2: unbounded relaxng include recursion leading to stack overflow

A flaw was identified in the RelaxNG parser of libxml2 related to how external schema inclusions are handled. The parser does not enforce a limit on inclusion depth when resolving nested <include> directives. Specially crafted or overly complex schemas can cause excessive recursion during parsing. This may lead to stack exhaustion and application crashes, creating a denial-of-service risk.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Vendors
Ibm Redhat Xmlsoft
Products
Aix Vios Enterprise Linux and 8 more
CVE-2026-105326

Cups: cups: argument injection in mailto notifier via notify-recipient-uri

An argument injection flaw was found in CUPS. When email notification is configured, the CUPS scheduler accepts printer subscription requests that supply a mailto notify-recipient-uri. The mailto notifier passes the recipient address to the configured sendmail program without ensuring it cannot be interpreted as command-line options. A remote attacker who can reach the CUPS service could supply a crafted recipient value starting with "-" to influence sendmail behavior. Successful exploitation depends on the installed mail transfer agent and CUPS network exposure, and may lead to execution of attacker-controlled commands with the privileges of the CUPS service user.

CVSS 3.1 · 2.5 Low EPSS < 1% KEV · Not listed
Vendors
Cups Redhat
Products
Cups Enterprise Linux Hardened Images and 1 more
CVE-2025-14821

Libssh: libssh: insecure default configuration leads to local man-in-the-middle attacks on windows

A flaw was found in libssh. This vulnerability allows local man-in-the-middle attacks, security downgrades of SSH (Secure Shell) connections, and manipulation of trusted host information, posing a significant risk to the confidentiality, integrity, and availability of SSH communications via an insecure default configuration on Windows systems where the library automatically loads configuration files from the C:\etc directory, which can be created and modified by unprivileged local users.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Libssh Redhat
Products
Libssh Enterprise Linux Hardened Images and 3 more
CVE-2026-111253

Dnf5daemon-server: dnf5: dnf5daemon-server: missing session-owner check allows foreign d-bus callers to replace another client's resolved transaction

A flaw was found in dnf5daemon-server. Session methods on dynamically exported D-Bus session objects do not verify that the caller is the unique sender that created the session. A local attacker can modify another user's live package-management session and replace its resolved transaction plan. If the legitimate session party later authorizes execution, the root daemon may apply the attacker-chosen package operations.

CVSS 3.1 · 6.6 Medium EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
Hardened Images Hummingbird
CVE-2026-56208

Libaom: libaom: heap buffer overflow in av1 encoder first-pass stats buffer via lap mode

A heap buffer overflow vulnerability was found in libaom, the reference AV1 codec implementation. A flaw in the AV1 encoder's Look-Ahead Processing (LAP) mode causes the first-pass stats ring buffer wrap-around guard to be bypassed when g_lag_in_frames is set to 1 or higher. This results in a 232-byte out-of-bounds write on every encoded frame after the second, corrupting adjacent heap objects. An attacker who can influence encoder configuration in a transcoding service or WebRTC session could exploit this to cause a denial of service (process crash) or potentially achieve code execution.

CVSS 3.1 · 7.6 High EPSS < 1% KEV · Not listed
Vendors
Aomedia Redhat
Products
Libaom Ai Inference Server Enterprise Linux and 11 more
CVE-2026-48864

Libsolv: heap buffer overflow in libsolv repopagestore via unchecked decompression of malicious .solv page data

A flaw was found in libsolv. This heap buffer overflow occurs during the decompression of attacker-controlled compressed data within `.solv` files due to insufficient input validation. An attacker can provide a specially crafted `.solv` file, which, when processed by a vulnerable application, can lead to out-of-bounds memory access. This could result in information disclosure, alteration of program execution, or a denial of service.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Opensuse Redhat
Products
Libsolv Cert Manager Discovery and 20 more
CVE-2026-123151

Gdb: gdb: stack buffer overflow in parse_tsv_definition via stale rs->buf tail

A flaw was found in the GNU debugger (GDB). When GDB connects to a remote debug target, a malicious target can cause GDB to overflow a buffer on the stack while parsing the target's replies. This can crash GDB or potentially allow the target to execute arbitrary code in the GDB client process with the privileges of the user running GDB.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Red Hat Redhat
Products
Enterprise Linux Enterprise Linux Hardened Images and 2 more