Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : UltraJSON vulnerabilities (USN-8219-1)

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8219-1 advisory. Cameron Criswell discovered that UltraJSON contained a memory leak that would occur when parsing large integers. An...

USN-8219-1 ujson vulnerabilities

Cameron Criswell discovered that UltraJSON contained a memory leak that would occur when parsing large integers. An attacker could possibly use this issue to cause UltraJSON to crash, resulting in a denial of service. This issue only affected Ubuntu 24.04 LTS, Ubuntu 25.10, and Ubuntu 26.04 LTS...

The vulnerability of the UltraJSON programming language package in Python, related to integer overflow, allows attackers to trigger a service failure.

The vulnerability of the UltraJSON programming language package in Python is related to integer overflow. Exploiting this vulnerability can allow a malicious actor to cause service failures remotely...

The vulnerability of the Python programming language-based UltraJSON package lies in the lack of memory release after the effective lifespan, which allows a malicious actor to trigger a service failure.

The vulnerability of the Python programming language-based UltraJSON package is related to the lack of memory release after the effective lifespan of the package. Exploiting this vulnerability can allow a remote attacker to cause a service failure...

Security Bulletin: IBM App Connect Enterprise Certified Container DesignerAuthoring operands that use mapping assistance are vulnerable to denial of service (CVE-2026-32874, CVE-2026-32875)

Summary Python module UltraJSON is used by IBM App Connect Enterprise Certified Container by the mapping assistance component. IBM App Connect Enterprise Certified Container DesignerAuthoring operands that use mapping assistance are vulnerable to denial of service. This bulletin provides patch...

[SECURITY] Fedora 43 Update: python-ujson-5.12.0-1.fc43

UltraJSON is an ultra fast JSON encoder and decoder written in pure C with bindings for Python...

[SECURITY] Fedora 44 Update: python-ujson-5.12.0-1.fc44

UltraJSON is an ultra fast JSON encoder and decoder written in pure C with bindings for Python...

CVE-2026-32875

A flaw was found in UltraJSON, a fast JSON encoder and decoder. This vulnerability allows a remote attacker to cause a denial of service DoS by providing a specially crafted large positive or negative indent value to the JSON serialization functions. This can lead to a buffer overflow, causing th...

CVE-2026-32874

A flaw was found in UltraJSON, a fast JSON encoder and decoder. A remote attacker can exploit this vulnerability by providing specially crafted JSON input that contains extremely large integers. When UltraJSON attempts to parse these inputs, it leads to an accumulating memory leak. This excessive...

CVE-2026-32875

UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Versions 5.10 through 5.11.0 are vulnerable to buffer overflow or infinite loop through large indent handling. ujson.dumps crashes the Python interpreter segmentation fault when the product of the indent...

DEBIAN-CVE-2026-32875

UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Versions 5.10 through 5.11.0 are vulnerable to buffer overflow or infinite loop through large indent handling. ujson.dumps crashes the Python interpreter segmentation fault when the product of the indent...

PYSEC-2026-2292

UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Versions 5.10 through 5.11.0 are vulnerable to buffer overflow or infinite loop through large indent handling. ujson.dumps crashes the Python interpreter segmentation fault when the product of the indent...

PYSEC-2026-2291

UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Versions 5.4.0 through 5.11.0 contain an accumulating memory leak in JSON parsing large outside of the range -2^63, 2^64 - 1 integers. The leaked memory is a copy of the string form of the integer plus a...

PYSEC-2026-2292

UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Versions 5.10 through 5.11.0 are vulnerable to buffer overflow or infinite loop through large indent handling. ujson.dumps crashes the Python interpreter segmentation fault when the product of the indent...

CVE-2026-32874

UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Versions 5.4.0 through 5.11.0 contain an accumulating memory leak in JSON parsing large outside of the range -2^63, 2^64 - 1 integers. The leaked memory is a copy of the string form of the integer plus a...

UBUNTU-CVE-2026-32874

UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Versions 5.4.0 through 5.11.0 contain an accumulating memory leak in JSON parsing large outside of the range -2^63, 2^64 - 1 integers. The leaked memory is a copy of the string form of the integer plus a...

UBUNTU-CVE-2026-32875

UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Versions 5.10 through 5.11.0 are vulnerable to buffer overflow or infinite loop through large indent handling. ujson.dumps crashes the Python interpreter segmentation fault when the product of the indent...

CVE-2026-32875

UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Versions 5.10 through 5.11.0 are vulnerable to buffer overflow or infinite loop through large indent handling. ujson.dumps crashes the Python interpreter segmentation fault when the product of the indent...

CVE-2026-32875

CVE-2026-32875 affects UltraJSON (Python bindings) and is evidenced across multiple feeds (Fedora advisories, IBM bulletin). The vulnerability resides in versions 5.10–5.11.0 where large indent handling can trigger an integer overflow/underflow when calculating memory for indentation, leading to ...

CVE-2026-32875

UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Versions 5.10 through 5.11.0 are vulnerable to buffer overflow or infinite loop through large indent handling. ujson.dumps crashes the Python interpreter segmentation fault when the product of the indent...