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CVE-2026-96637

Pillow: Decompression bomb check bypass in SpiderImagePlugin.seek() leads to unbounded allocation DoS

Pillow is a Python imaging library. Prior to 13.0.0, SpiderImageFile.seek() in src/PIL/SpiderImagePlugin.py reparses a later SPIDER stack frame and replaces self._size without rerunning Image._decompression_bomb_check(). A tiny file can use a safe first frame to pass Image.open() and then declare very large dimensions in a later mode F frame. Loading that frame allocates approximately four bytes per attacker-declared pixel and can consume multiple gigabytes of memory. This issue is fixed in version 13.0.0.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Python Python-pillow
Products
Pillow Pillow
CVE-2026-112393

Pillow: Heap buffer overflow in _tiffWriteProc when saving TIFF to BytesIO

Pillow is a Python imaging library. From 2.0.0 until 13.0.0, Pillow has a heap buffer overflow and stale-heap disclosure in _tiffWriteProc when saving compressed TIFF data through libtiff to a target without a usable fileno(), such as BytesIO. The callback sizes its allocation from the prior buffer size instead of the current write position, allowing an attacker-controlled out-of-line TIFF tag or retained ICC profile to be copied beyond the allocation after libtiff seeks forward. This overflow can crash the process and may allow code execution. Independently, unwritten alignment gaps in compressed TIFF output larger than 64 KiB can disclose stale heap bytes without a crafted tag. File paths and targets with real file descriptors are unaffected. This issue is fixed in version 13.0.0.

CVSS 4.0 · 9.2 Critical EPSS 1.0% KEV · Not listed
Vendors
Python Python-pillow
Products
Pillow Pillow
CVE-2026-112394

Pillow: P;2L and P;4L decoders may read 1 to 3 bytes past the passed buffer size

Pillow is a Python imaging library. Prior to 13.0.0, Pillow's P;2L and P;4L raw decoders can read past the end of an input buffer. ImagingRawDecode calculates a packed-pixel row size, while the unpackers read separately padded bit planes. A caller can supply a buffer and image dimensions whose accepted size is smaller than the unpacker's actual footprint. This can disclose up to three adjacent heap bytes in output pixels or crash the process. This issue is fixed in version 13.0.0.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Python Python-pillow
Products
Pillow Pillow
CVE-2026-112396

Pillow: Heap use-after-free when encoding TIFF to an in-memory buffer

Pillow is a Python imaging library. From 11.3.0 until 13.0.0, Pillow has a heap use-after-free when libtiff rejects a tag while encoding TIFF data to an in-memory buffer. When an application saves attacker-influenced TIFF tags to BytesIO, libtiff can reject a tag during encoding in ImagingLibTiffEncode; the error path then frees the output buffer without closing or clearing the TIFF handle, and later cleanup flushes through the write callback into freed memory, which can crash the process and may enable code execution. This issue is fixed in version 13.0.0.

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
Vendors
Python Python-pillow
Products
Pillow Pillow
CVE-2026-112392

Pillow: NULL dereference in ImagingExpand via rank filters on zero-size images

Pillow is a Python imaging library. Prior to 13.0.0, Pillow's rank-based filters can dereference invalid image storage for a zero-size image. ImagingExpand() allocates a non-empty output and then faults while replicating edges by reading the first pixel from empty input storage; ImagingRankFilter is never reached. An attacker can supply or cause creation of a zero-size image to an application that applies a rank, median, minimum, or maximum filter. This causes a native process crash. This issue is fixed in version 13.0.0.

CVSS 4.0 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Python Python-pillow
Products
Pillow Pillow
CVE-2024-3220

Default mimetype known files writeable on Windows

There is a defect in the CPython standard library module “mimetypes” where on Windows the default list of known file locations are writable meaning other users can create invalid files to cause MemoryError to be raised on Python runtime startup or have file extensions be interpreted as the incorrect file type. This defect is caused by the default locations of Linux and macOS platforms (such as “/etc/mime.types”) also being used on Windows, where they are user-writable locations (“C:\etc\mime.types”). To work-around this issue a user can call mimetypes.init() with an empty list (“[]”) on Windows platforms to avoid using the default list of known file locations.

CVSS 4.0 · 2.3 Low EPSS < 1% KEV · Not listed
Vendors
Python
Products
Cpython
CVE-2026-12345

Race condition in tempfile.TemporaryDirectory cleanup allows deleting files outside the temporary directory

The cleanup of tempfile.TemporaryDirectory is vulnerable to a race condition. An attacker who can modify the tree during cleanup can replace a directory with a symbolic link, causing files outside of the temporary directory to be deleted or have their permissions and file flags reset, with the privileges of the process performing the cleanup. Note that platforms where shutil.rmtree.avoids_symlink_attacks is false, remain affected, and file flags may still be reset outside of the tree on all platforms.

CVSS 4.0 · 5.9 Medium EPSS < 1% KEV · Not listed
Vendors
Python
Products
Cpython
CVE-2026-112390

Pillow: Infinite loop in MIC n_frames when the embedded TIFF

Pillow is a Python imaging library. From 7.2.0 until 13.0.0, Pillow can enter an infinite loop while determining the frame count of a MIC image. MicImageFile inherits TIFF frame traversal, but MicImageFile.tell reports the OLE stream index and its seek() resets TIFF frame state, so an embedded TIFF with at least three IFDs never advances. When an application with olefile installed reads n_frames or saves all frames from a crafted MIC file, the non-advancing traversal can hold a worker at full CPU indefinitely. This issue is fixed in version 13.0.0.

CVSS 4.0 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Python Python-pillow
Products
Pillow Pillow
CVE-2026-112391

Pillow: PdfParser can recurse without limit in get_value() and linearize_page_tree()

Pillow is a Python imaging library. From 5.1.0 until 13.0.0, Pillow's PdfParser.get_value() can recurse without a limit while reading nested PDF objects. The parser follows attacker-controlled arrays and dictionaries when an existing PDF is opened for append. An attacker can provide a deeply nested PDF to an application that saves an image with PDF append enabled. This can raise an uncaught RecursionError or terminate the worker, causing denial of service. This issue is fixed in version 13.0.0.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Python Python-pillow
Products
Pillow Pillow
CVE-2018-20406

python: Integer overflow in Modules/_pickle.c allows for memory exhaustion if serializing gigabytes of data

Modules/_pickle.c in Python before 3.7.1 has an integer overflow via a large LONG_BINPUT value that is mishandled during a "resize to twice the size" attempt. This issue might cause memory exhaustion, but is only relevant if the pickle format is used for serializing tens or hundreds of gigabytes of data. This issue is fixed in: v3.4.10, v3.4.10rc1; v3.5.10, v3.5.10rc1, v3.5.7, v3.5.7rc1, v3.5.8, v3.5.8rc1, v3.5.8rc2, v3.5.9; v3.6.10, v3.6.10rc1, v3.6.11, v3.6.11rc1, v3.6.12, v3.6.7, v3.6.7rc1, v3.6.7rc2, v3.6.8, v3.6.8rc1, v3.6.9, v3.6.9rc1; v3.7.1, v3.7.1rc1, v3.7.1rc2, v3.7.2, v3.7.2rc1, v3.7.3, v3.7.3rc1, v3.7.4, v3.7.4rc1, v3.7.4rc2, v3.7.5, v3.7.5rc1, v3.7.6, v3.7.6rc1, v3.7.7, v3.7.7rc1, v3.7.8, v3.7.8rc1, v3.7.9.

CVSS 3.0 · 7.5 High EPSS 5.8% KEV · Not listed
Vendors
Debian Fedoraproject Python and 1 more
Products
Debian Linux Fedora Python and 1 more
CVE-2018-1061

python: DOS via regular expression backtracking in difflib.IS_LINE_JUNK method in difflib

python before versions 2.7.15, 3.4.9, 3.5.6rc1, 3.6.5rc1 and 3.7.0 is vulnerable to catastrophic backtracking in the difflib.IS_LINE_JUNK method. An attacker could use this flaw to cause denial of service.

CVSS 3.0 · 6.5 Medium EPSS 4.7% KEV · Not listed
Vendors
Canonical Debian Fedoraproject and 2 more
Products
Ubuntu Linux Debian Linux Fedora and 11 more
CVE-2022-45061

python: CPU denial of service via inefficient IDNA decoder

An issue was discovered in Python before 3.11.1. An unnecessary quadratic algorithm exists in one path when processing some inputs to the IDNA (RFC 3490) decoder, such that a crafted, unreasonably long name being presented to the decoder could lead to a CPU denial of service. Hostnames are often supplied by remote servers that could be controlled by a malicious actor; in such a scenario, they could trigger excessive CPU consumption on the client attempting to make use of an attacker-supplied supposed hostname. For example, the attack payload could be placed in the Location header of an HTTP response with status code 302. A fix is planned in 3.11.1, 3.10.9, 3.9.16, 3.8.16, and 3.7.16.

CVSS 3.1 · 7.5 High EPSS 3.3% KEV · Not listed
Vendors
Fedoraproject Netapp Python and 1 more
Products
Fedora Active Iq Unified Manager Bootstrap Os and 10 more
CVE-2022-37454

XKCP: buffer overflow in the SHA-3 reference implementation

The Keccak XKCP SHA-3 reference implementation before fdc6fef has an integer overflow and resultant buffer overflow that allows attackers to execute arbitrary code or eliminate expected cryptographic properties. This occurs in the sponge function interface.

CVSS 3.1 · 9.8 Critical EPSS 7.4% KEV · Not listed
Vendors
Debian Extended Keccak Code Package Project Fedoraproject and 6 more
Products
Debian Linux Extended Keccak Code Package Fedora and 6 more
CVE-2022-26488

python: local privilege escalation via search path in Windows

In Python before 3.10.3 on Windows, local users can gain privileges because the search path is inadequately secured. The installer may allow a local attacker to add user-writable directories to the system search path. To exploit, an administrator must have installed Python for all users and enabled PATH entries. A non-administrative user can trigger a repair that incorrectly adds user-writable paths into PATH, enabling search-path hijacking of other users and system services. This affects Python (CPython) through 3.7.12, 3.8.x through 3.8.12, 3.9.x through 3.9.10, and 3.10.x through 3.10.2.

CVSS 3.1 · 7.0 High EPSS 1.5% KEV · Not listed
Vendors
Microsoft Netapp Python
Products
Windows Active Iq Unified Manager Ontap Select Deploy Administration Utility and 1 more
CVE-2022-0391

python: urllib.parse does not sanitize URLs containing ASCII newline and tabs

A flaw was found in Python, specifically within the urllib.parse module. This module helps break Uniform Resource Locator (URL) strings into components. The issue involves how the urlparse method does not sanitize input and allows characters like '\r' and '\n' in the URL path. This flaw allows an attacker to input a crafted URL, leading to injection attacks. This flaw affects Python versions prior to 3.10.0b1, 3.9.5, 3.8.11, 3.7.11 and 3.6.14.

CVSS 3.1 · 7.5 High EPSS 8.5% KEV · Not listed
Vendors
Fedoraproject Netapp Oracle and 2 more
Products
Fedora Active Iq Unified Manager Hci and 9 more
CVE-2021-28861

python: open redirection vulnerability in lib/http/server.py may lead to information disclosure

Python 3.x through 3.10 has an open redirection vulnerability in lib/http/server.py due to no protection against multiple (/) at the beginning of URI path which may leads to information disclosure. NOTE: this is disputed by a third party because the http.server.html documentation page states "Warning: http.server is not recommended for production. It only implements basic security checks."

CVSS 3.1 · 6.5 Medium EPSS 2.8% KEV · Not listed
Vendors
Fedoraproject Python Redhat
Products
Fedora Python Enterprise Linux and 1 more
CVE-2021-28363

python-urllib3: HTTPS proxy host name not validated when using default SSLContext

The urllib3 library 1.26.x before 1.26.4 for Python omits SSL certificate validation in some cases involving HTTPS to HTTPS proxies. The initial connection to the HTTPS proxy (if an SSLContext isn't given via proxy_config) doesn't verify the hostname of the certificate. This means certificates for different servers that still validate properly with the default urllib3 SSLContext will be silently accepted.

CVSS 3.1 · 6.5 Medium EPSS 2.2% KEV · Not listed
Vendors
Fedoraproject Oracle Python and 1 more
Products
Fedora Peoplesoft Enterprise Peopletools Urllib3 and 1 more
CVE-2021-23336

Web Cache Poisoning

The package python/cpython from 0 and before 3.6.13, from 3.7.0 and before 3.7.10, from 3.8.0 and before 3.8.8, from 3.9.0 and before 3.9.2 are vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter.

CVSS 3.1 · 5.9 Medium EPSS 41.1% KEV · Not listed
Vendors
Debian Djangoproject Fedoraproject and 4 more
Products
Debian Linux Django Fedora and 11 more
CVE-2021-3737

python: urllib: HTTP client possible infinite loop on a 100 Continue response

A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop, consuming CPU time. The highest threat from this vulnerability is to system availability.

CVSS 3.1 · 7.5 High EPSS 13.2% KEV · Not listed
Vendors
Canonical Fedoraproject Netapp and 3 more
Products
Ubuntu Linux Fedora Hci and 15 more