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CVE-2026-76490

Cisco Expressway Series Software Hardening Release: October 2026 - Out-of-bounds Write Vulnerabilities

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Expressway Series software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.   The vulnerabilities tracked by CVE-2026-76490 are related to issues concerning out-of-bounds writes that are grouped under the Common Weakness Enumeration (CWE) Base CWE-787.

CVSS 3.1 · 8.6 High EPSS < 1% KEV · Not listed
Vendors
Cisco
Products
Expressway Series
CVE-2026-76459

Cisco NX-OS Software Security Hardening Release: October 2026 - Out-of-bounds Write Vulnerabilities

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco NX-OS engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-76459 are related to out-of-bounds write issues that are grouped under the Common Weakness Enumeration (CWE) CWE-787.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
—
Products
—
CVE-2026-20043

Multiple Cisco Products Snort 3 Software Hardening Release: October 2026

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20043 are related to issues concerning out-of-bounds writes that are grouped under the Common Weakness Enumeration (CWE) Base CWE-787.

CVSS 3.1 · 9 Critical EPSS < 1% KEV · Not listed
Vendors
Cisco
Products
Cisco Open Source Snort3 Cisco Secure Firewall Threat Defense (ftd) Software Cisco Utd Snort Ips Engine Software and 2 more
CVE-2023-3812

Kernel: tun: bugs for oversize packet when napi frags enabled in tun_napi_alloc_frags

An out-of-bounds memory access flaw was found in the Linux kernel’s TUN/TAP device driver functionality in how a user generates a malicious (too big) networking packet when napi frags is enabled. This flaw allows a local user to crash or potentially escalate their privileges on the system.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Linux Redhat
Products
Linux Kernel Enterprise Linux Rhel Aus and 5 more
CVE-2023-4273

Kernel: exfat: stack overflow in exfat_get_uniname_from_ext_entry

A flaw was found in the exFAT driver of the Linux kernel. The vulnerability exists in the implementation of the file name reconstruction function, which is responsible for reading file name entries from a directory index and merging file name parts belonging to one file into a single long file name. Since the file name characters are copied into a stack variable, a local privileged attacker could use this flaw to overflow the kernel stack.

CVSS 3.1 · 6 Medium EPSS < 1% KEV · Not listed
Vendors
Debian Fedoraproject Linux and 2 more
Products
Debian Linux Fedora Linux Kernel and 10 more
CVE-2023-4911

Glibc: buffer overflow in ld.so leading to privilege escalation

A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. This issue could allow a local attacker to use maliciously crafted GLIBC_TUNABLES environment variables when launching binaries with SUID permission to execute code with elevated privileges.

CVSS 3.1 · 7.8 High EPSS 63.8% KEV · Listed
Vendors
Canonical Debian Fedoraproject and 4 more
Products
Ubuntu Linux Debian Linux Fedora and 49 more
CVE-2023-43785

Libx11: out-of-bounds memory access in _xkbreadkeysyms()

A vulnerability was found in libX11 due to a boundary condition within the _XkbReadKeySyms() function. This flaw allows a local user to trigger an out-of-bounds read error and read the contents of memory on the system.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Fedoraproject Redhat X.org
Products
Fedora Enterprise Linux Rhel Els and 1 more
CVE-2023-42753

Kernel: netfilter: potential slab-out-of-bound access due to integer underflow

An array indexing vulnerability was found in the netfilter subsystem of the Linux kernel. A missing macro could lead to a miscalculation of the `h->nets` array offset, providing attackers with the primitive to arbitrarily increment/decrement a memory buffer out-of-bound. This issue may allow a local user to crash the system or potentially escalate their privileges on the system.

CVSS 3.1 · 7 High EPSS < 1% KEV · Not listed
Vendors
Debian Linux Redhat
Products
Debian Linux Linux Kernel Enterprise Linux and 7 more
CVE-2023-4692

Grub2: out-of-bounds write at fs/ntfs.c may lead to unsigned code execution

An out-of-bounds write flaw was found in grub2's NTFS filesystem driver. This issue may allow an attacker to present a specially crafted NTFS filesystem image, leading to grub's heap metadata corruption. In some circumstances, the attack may also corrupt the UEFI firmware heap metadata. As a result, arbitrary code execution and secure boot protection bypass may be achieved.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Gnu Redhat
Products
Grub2 Enterprise Linux Rhel Els
CVE-2023-3745

Imagemagick: heap-buffer-overflow in pushcharpixel() in quantum-private.h

A heap-based buffer overflow issue was found in ImageMagick's PushCharPixel() function in quantum-private.h. This issue may allow a local attacker to trick the user into opening a specially crafted file, triggering an out-of-bounds read error and allowing an application to crash, resulting in a denial of service.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
Vendors
Imagemagick Redhat
Products
Imagemagick Rhel Els
CVE-2023-52356

Libtiff: segment fault in libtiff in tiffreadrgbatileext() leading to denial of service

A segment fault (SEGV) flaw was found in libtiff that could be triggered by passing a crafted tiff file to the TIFFReadRGBATileExt() API. This flaw allows a remote attacker to cause a heap-buffer overflow, leading to a denial of service.

CVSS 3.1 · 7.5 High EPSS 2.7% KEV · Not listed
Vendors
Apple Debian Libtiff and 1 more
Products
Ipados Iphone Os Macos and 13 more
CVE-2026-93523

X.Org Server XInput2 PassiveUngrabDevice Out-of-Bounds Write

A heap buffer overflow caused by a XIPassiveUngrabDevice request with an out-of-range modifier value in X.Org X Server before 21.1.15 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
X.org
Products
X Server Xorg-x11-server Xwayland
CVE-2026-93520

X.Org Server XKB ChangeKeycodeRange Heap Out-of-Bounds Write

A heap buffer overflow caused by mismatching size calculations between XkbAllocNames and ChangeKeycodeRange in X.org X server before 2.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
X.org
Products
Xorg-server Xorg-x11-server Xwayland
CVE-2026-123855

Command Injection via Enterprise Configuration URLs in JetBrains Toolbox App

In JetBrains Toolbox App before 3.6.1 command injection was possible via enterprise configuration URLs

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Jetbrains
Products
Toolbox
CVE-2026-63476

isomorphic-git: Unbounded memory allocation from attacker-controlled delta target size (DoS)

isomorphic-git is a pure JavaScript implementation of Git for Node.js and browsers. Prior to 1.38.6, isomorphic-git reads a server-controlled targetSize while applying a packfile delta in src/utils/applyDelta.js and passes it without a bound to Buffer.alloc(targetSize). A malicious or man-in-the-middle-controlled remote can send one delta header that causes git.clone() or git.fetch() to allocate approximately 2 GB before validating the actual delta output. GitPackIndex.fromPack swallows the later size-mismatch error, so a host with sufficient memory may retain the resource waste without a visible failure, while containers, serverless functions, and small virtual machines may terminate. Node.js heap limits do not mitigate the off-heap Buffer allocation. This issue is fixed in version 1.38.6.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Vendors
Isomorphic-git
Products
Isomorphic-git
CVE-2026-120752

PyMuPDF 1.25.3 before 2.0 Stack Buffer Overflow via add_freetext_annot() Callout

PyMuPDF 1.25.3 before 2.0 contains a stack-based buffer overflow vulnerability in JM_set_annot_callout_line() that copies a caller-supplied number of callout points into a fixed three-element stack array. Attackers who control the callout argument passed to Page.add_freetext_annot() can supply four or more points to overwrite the stack frame, crashing the process or executing code.

CVSS 4.0 · 7.7 High EPSS < 1% KEV · Not listed
Vendors
—
Products
—
CVE-2026-105978

Command Injection in Management Control Functions

Improper input validation in management control functions may allow a remote attacker with high privileges to inject operating system commands and execute them with root privileges.

CVSS 4.0 · 8.6 High EPSS < 1% KEV · Not listed
Vendors
Welotec
Products
Tk100 Tk500 V2 Tk500 V3
CVE-2026-99261

drm/amdgpu: correct reservation fence slots for userq per-vm BOs eviction

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: correct reservation fence slots for userq per-vm BOs eviction It fixes both the move overflow and the eviction fence add for evicting these per-vm BOs.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
Vendors
Linux
Products
Linux Linux Kernel