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CVE-2026-102925

virtualenv bash and fish activation scripts execute commands embedded in paths

virtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.13, the generated activate (bash and zsh) and activate.fish scripts place values already escaped by shlex.quote inside an additional quoted context. In the bash and zsh script, a crafted virtual environment path reaches __VIRTUAL_ENV__ when a relocated environment's recorded directory is absent; in the fish script, crafted Tcl or Tk library paths reach __TCL_LIBRARY__ or __TK_LIBRARY__. The surplus quotes can terminate the data-only quoted run and leave shell metacharacters parsed as commands when a user sources the activation script, allowing code execution with that user's privileges. This issue is fixed in version 21.7.13.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Pypa Python Virtualenv
Products
Virtualenv Virtualenv Virtualenv
CVE-2026-119170

Regression in FIPS enforcement of hash algorithms affecting only Python 3.14.10

There was a regression in how FIPS algorithms were enforced for the hashlib module. Only users that are using OpenSSL in FIPS mode are affected. Only Python 3.14.10 is affected, all other Python versions are unaffected.

CVSS 4.0 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Python Python Software Foundation
Products
Cpython Cpython
CVE-2026-103995

Lenient parsing of integers for response body and chunk framing

Response body and chunk parsing would handle non-hex or negative integers incorrectly which could result in misinterpreting HTTP response contents.

CVSS 4.0 · 2 Low EPSS < 1% KEV · Not listed
Vendors
Python Python Software Foundation
Products
Cpython Cpython
CVE-2022-48564

python: DoS when processing malformed Apple Property List files in binary format

read_ints in plistlib.py in Python through 3.9.1 is vulnerable to a potential DoS attack via CPU and RAM exhaustion when processing malformed Apple Property List files in binary format.

CVSS 3.1 · 6.5 Medium EPSS 1.7% KEV · Not listed
Vendors
Netapp Python Redhat
Products
Active Iq Unified Manager Python Enterprise Linux and 1 more
CVE-2026-115557

Distrust compromised intermediate certificates in ssl module

Python has added a denylist for known compromised certificates to the "ssl" module to ensure user safety even without certificate revocation configured. Known compromised certificates will automatically be rejected regardless of the SSLContext policy configuration.

CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
Vendors
Python Python Software Foundation
Products
Cpython Cpython
CVE-2026-114583

tar filter allows writing outside destination via empty-named symlink

tarfile.tar_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() with filter="tar" to write files outside the destination directory, subject to the permissions of the extracting process. This is the tarfile.tar_filter counterpart of CVE-2026-7774, which covered tarfile.data_filter.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Python Python Software Foundation
Products
Cpython Cpython
CVE-2026-116566

socket.getaddrinfo() accepts embedded null bytes in host and port

socket.getaddrinfo() previously accepted null bytes within *host* and *port* parameters which can cause the values to be silently truncated.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Python Python Software Foundation
Products
Cpython Cpython
CVE-2026-96642

Pillow: TarIO negative size field causes infinite CPU-spin loop

Pillow is a Python imaging library. Prior to 13.0.0, the TarIO initializer in src/PIL/TarIO.py accepts a negative octal member size and computes a backward seek that returns to the same 512-byte header. When the requested member name does not match, the parser repeatedly reads that header, consumes a full CPU core, and never returns. TarIO is reached only when an application directly uses PIL.TarIO.TarIO rather than the default Image.open() path. 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-2026-96636

Pillow: Decompression-bomb protection bypass via multi-frame seek() in MPO and DCX (MpoImageFile.seek / DcxImageFile.seek)

Pillow is a Python imaging library. Prior to 13.0.0, MpoImageFile.seek() and DcxImageFile.seek() reparse later MPO or DCX frames and replace self._size without rerunning Image._decompression_bomb_check(). A crafted multi-frame image can use a tiny first frame to pass Image.open() and then declare an over-limit later frame. Normal frame iteration through seek(), load(), or ImageSequence.Iterator can decode that frame and commit hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Python Python-pillow
Products
Pillow Pillow
CVE-2026-114501

Pillow: Arrow export leaks stale heap memory when PILLOW_ALIGNMENT > 1

Pillow is a Python imaging library. From 11.2.1 until 13.0.0, Arrow export assumes that an image's rows are tightly contiguous and exports from im->blocks[0].ptr even when PILLOW_ALIGNMENT makes aligned_linesize include row padding or an aligned offset before the first row. The resulting Arrow buffer can include uninitialized padding, bytes preceding the first row, or stale heap contents from previously freed images. Applications that configure alignment and export images to Arrow can therefore disclose one user's pixels or other process memory to another user. 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-2024-9287

Virtual environment (venv) activation scripts don't quote paths

A vulnerability has been found in the CPython `venv` module and CLI where path names provided when creating a virtual environment were not quoted properly, allowing the creator to inject commands into virtual environment "activation" scripts (ie "source venv/bin/activate"). This means that attacker-controlled virtual environments are able to run commands when the virtual environment is activated. Virtual environments which are not created by an attacker or which aren't activated before being used (ie "./venv/bin/python") are not affected.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Python Redhat
Products
Python Enterprise Linux Rhel Eus
CVE-2026-96639

Pillow multi-frame loaders can reuse stale native image storage after mode transitions

Pillow is a Python imaging library. From 11.0.0 until 13.0.0, multi-frame loaders can retain an ImagingCore allocation created for a narrow frame mode while a later frame of the same dimensions changes the logical mode and decoder tiles to wider RGB or CMYK data. ImageFile.load_prepare() reuses the stale native storage because _im is non-null without verifying that its mode and size still match. Crafted PSD, MPO, DCX, or MIC frame transitions can then write wider pixels into the narrow allocation, causing native out-of-bounds writes and crashes. The MPO path can also cause a native over-read and, in demonstrated runtime-specific profiles, command execution. This issue is fixed in version 13.0.0.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
Python Python-pillow
Products
Pillow Pillow
CVE-2026-96644

Pillow: Heap over-read in WMF/EMF rendering via 16-bit dimension truncation (Windows builds)

Pillow is a Python imaging library. Prior to 13.0.0 on Windows, src/PIL/WmfImagePlugin.py passes unchecked 32-bit WMF or EMF dimensions to the native drawwmf handler in src/display.c. The handler sizes a DIB allocation from 16-bit-truncated bcWidth and bcHeight fields but copies pixel data using the original full dimensions. A crafted wide, short metafile can pass the pixel-count decompression-bomb check and make the Windows-only renderer read beyond the heap buffer, potentially disclosing memory or crashing the process. This issue is fixed in version 13.0.0.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Microsoft Python Python-pillow
Products
Windows Pillow Pillow
CVE-2026-96638

Pillow: BMP RLE decoder memory-amplification DoS via unbounded delta escape / absolute mode

Pillow is a Python imaging library. From 9.1.0 until 13.0.0, BmpRleDecoder.decode() in src/PIL/BmpImagePlugin.py permits crafted RLE BMP delta escapes and absolute-mode runs to append beyond the remaining dest_length without a per-branch cap. A delta can add roughly 255 image rows in one iteration, so a kilobyte-sized file with a large but permitted width can expand the data bytearray to hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Python Python-pillow
Products
Pillow Pillow
CVE-2026-112898

Pillow: Image.quantize() with empty palette leaks uninitialized stack memory

Pillow is a Python imaging library. From 9.1.0 until 13.0.0, Pillow can disclose uninitialized stack memory when Image.quantize() uses an empty palette. ImagingPaletteCacheUpdate() leaves a local cache array uninitialized when the palette has zero entries, and the conversion path emits those bytes as output pixel indices. An attacker who controls the palette image can obtain stack contents from a returned PNG or GIF. This can disclose addresses and stack-canary data without an out-of-bounds access, memory corruption, or process crash. This issue is fixed in version 13.0.0.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Python Python-pillow
Products
Pillow Pillow
CVE-2026-112893

Pillow: Invalid free in FreeType glyph rendering when a stroker is active

Pillow is a Python imaging library. From 10.0.0 until 13.0.0, Pillow can free an invalid glyph pointer during FreeType rendering with an active stroker. If FT_Load_Glyph fails, cleanup may call FT_Done_Glyph on an uninitialized or stale glyph variable. An attacker can supply a malformed font as untrusted bytes to an application that draws text with a nonzero stroke width, forcing the glyph-load failure path. This can corrupt memory or crash the process. 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-2026-112404

Pillow: OOB read in TiffDecode.c tile and RGBA paths leaks heap memory into pixels

Pillow is a Python imaging library. From 8.1.0 until 13.0.0, Pillow's TIFF tile and RGBA decode paths can read beyond row data produced by libtiff. In _decodeTile and the RGBA unpacker path, when Pillow and libtiff interpret duplicated PhotometricInterpretation or BitsPerSample tags differently, Pillow does not verify that the required input row fits inside the row libtiff produced, while the strip path has this validation. Loading pixels from such a crafted TIFF can expose adjacent heap data in output pixels or crash the process. This issue is fixed in version 13.0.0.

CVSS 4.0 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Python Python-pillow
Products
Pillow Pillow
CVE-2026-112399

Pillow: APNG background disposal allocates full canvas before decompression bomb check

Pillow is a Python imaging library. From 8.1.0 until 13.0.0, Pillow can allocate an APNG disposal background at the full canvas size before applying the decompression-bomb check. A crafted APNG with a small first frame, a very large declared canvas, and background disposal or first-frame OP_PREVIOUS reaches PngImageFile._seek while Image.open() positions frame zero. The full-canvas allocation occurs inside Image.open() without requiring pixel loading or frame iteration. This can exhaust memory and deny service. This issue is fixed in version 13.0.0.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Python Python-pillow
Products
Pillow Pillow
CVE-2026-112395

Pillow tiled-TIFF decoder reads past tile buffer in copy4 (Unpack.c:1290)

Pillow is a Python imaging library. From 8.2.0 until 13.0.0, Pillow's tiled-TIFF decoder can read past the tile buffer while copying four-byte pixels. In _decodeTile, libtiff can return a tile allocation smaller than the required row stride multiplied by the tile length, and Pillow's stride-and-copy loop walks beyond that allocation. An attacker can supply a crafted tiled TIFF to an application that loads it. This can expose adjacent heap data in pixels or crash the process. This issue is fixed in version 13.0.0.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Python Python-pillow
Products
Pillow Pillow