{ "summary": { "snap": { "added": [], "removed": [], "diff": [] }, "deb": { "added": [], "removed": [], "diff": [ "libpython3.13-minimal", "libpython3.13-stdlib", "libtasn1-6", "python3-urllib3", "python3.13", "python3.13-minimal" ] } }, "diff": { "deb": [ { "name": "libpython3.13-minimal", "from_version": { "source_package_name": "python3.13", "source_package_version": "3.13.3-1ubuntu0.4", "version": "3.13.3-1ubuntu0.4" }, "to_version": { "source_package_name": "python3.13", "source_package_version": "3.13.3-1ubuntu0.5", "version": "3.13.3-1ubuntu0.5" }, "cves": [ { "cve": "CVE-2025-13836", "url": "https://ubuntu.com/security/CVE-2025-13836", "cve_description": "When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.", "cve_priority": "medium", "cve_public_date": "2025-12-01 18:16:00 UTC" } ], "launchpad_bugs_fixed": [], "changes": [ { "cves": [ { "cve": "CVE-2025-13836", "url": "https://ubuntu.com/security/CVE-2025-13836", "cve_description": "When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.", "cve_priority": "medium", "cve_public_date": "2025-12-01 18:16:00 UTC" } ], "log": [ "", " * SECURITY UPDATE: HTTP Content-Length denial of service", " - debian/patches/CVE-2025-13836.patch: Read large data in chunks with", " geometric reads in Lib/http/client.py and add tests in ", " Lib/test/test_httplib.py", " - CVE-2025-13836", "" ], "package": "python3.13", "version": "3.13.3-1ubuntu0.5", "urgency": "medium", "distributions": "plucky-security", "launchpad_bugs_fixed": [], "author": "Vyom Yadav ", "date": "Thu, 08 Jan 2026 17:33:54 +0530" } ], "notes": null, "is_version_downgrade": false }, { "name": "libpython3.13-stdlib", "from_version": { "source_package_name": "python3.13", "source_package_version": "3.13.3-1ubuntu0.4", "version": "3.13.3-1ubuntu0.4" }, "to_version": { "source_package_name": "python3.13", "source_package_version": "3.13.3-1ubuntu0.5", "version": "3.13.3-1ubuntu0.5" }, "cves": [ { "cve": "CVE-2025-13836", "url": "https://ubuntu.com/security/CVE-2025-13836", "cve_description": "When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.", "cve_priority": "medium", "cve_public_date": "2025-12-01 18:16:00 UTC" } ], "launchpad_bugs_fixed": [], "changes": [ { "cves": [ { "cve": "CVE-2025-13836", "url": "https://ubuntu.com/security/CVE-2025-13836", "cve_description": "When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.", "cve_priority": "medium", "cve_public_date": "2025-12-01 18:16:00 UTC" } ], "log": [ "", " * SECURITY UPDATE: HTTP Content-Length denial of service", " - debian/patches/CVE-2025-13836.patch: Read large data in chunks with", " geometric reads in Lib/http/client.py and add tests in ", " Lib/test/test_httplib.py", " - CVE-2025-13836", "" ], "package": "python3.13", "version": "3.13.3-1ubuntu0.5", "urgency": "medium", "distributions": "plucky-security", "launchpad_bugs_fixed": [], "author": "Vyom Yadav ", "date": "Thu, 08 Jan 2026 17:33:54 +0530" } ], "notes": null, "is_version_downgrade": false }, { "name": "libtasn1-6", "from_version": { "source_package_name": "libtasn1-6", "source_package_version": "4.20.0-2", "version": "4.20.0-2" }, "to_version": { "source_package_name": "libtasn1-6", "source_package_version": "4.20.0-2ubuntu0.25.04.1", "version": "4.20.0-2ubuntu0.25.04.1" }, "cves": [ { "cve": "CVE-2025-13151", "url": "https://ubuntu.com/security/CVE-2025-13151", "cve_description": "Stack-based buffer overflow in libtasn1 version: v4.20.0. The function fails to validate the size of input data resulting in a buffer overflow in asn1_expend_octet_string.", "cve_priority": "medium", "cve_public_date": "2026-01-07 22:15:00 UTC" } ], "launchpad_bugs_fixed": [], "changes": [ { "cves": [ { "cve": "CVE-2025-13151", "url": "https://ubuntu.com/security/CVE-2025-13151", "cve_description": "Stack-based buffer overflow in libtasn1 version: v4.20.0. The function fails to validate the size of input data resulting in a buffer overflow in asn1_expend_octet_string.", "cve_priority": "medium", "cve_public_date": "2026-01-07 22:15:00 UTC" } ], "log": [ "", " * SECURITY UPDATE: Stack-based buffer overflow", " - debian/patches/CVE-2025-13151.patch: fix asn1_expand_octet_string", " buffer size in lib/decoding.c.", " - CVE-2025-13151", "" ], "package": "libtasn1-6", "version": "4.20.0-2ubuntu0.25.04.1", "urgency": "medium", "distributions": "plucky-security", "launchpad_bugs_fixed": [], "author": "Marc Deslauriers ", "date": "Thu, 08 Jan 2026 12:22:51 -0500" } ], "notes": null, "is_version_downgrade": false }, { "name": "python3-urllib3", "from_version": { "source_package_name": "python-urllib3", "source_package_version": "2.3.0-2ubuntu0.2", "version": "2.3.0-2ubuntu0.2" }, "to_version": { "source_package_name": "python-urllib3", "source_package_version": "2.3.0-2ubuntu0.4", "version": "2.3.0-2ubuntu0.4" }, "cves": [ { "cve": "CVE-2025-66471", "url": "https://ubuntu.com/security/CVE-2025-66471", "cve_description": "urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.0 and prior to 2.6.0, the Streaming API improperly handles highly compressed data. urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. When streaming a compressed response, urllib3 can perform decoding or decompression based on the HTTP Content-Encoding header (e.g., gzip, deflate, br, or zstd). The library must read compressed data from the network and decompress it until the requested chunk size is met. Any resulting decompressed data that exceeds the requested amount is held in an internal buffer for the next read operation. The decompression logic could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This can result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data.", "cve_priority": "medium", "cve_public_date": "2025-12-05 17:16:00 UTC" }, { "cve": "CVE-2026-21441", "url": "https://ubuntu.com/security/CVE-2026-21441", "cve_description": "urllib3 is an HTTP client library for Python. urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. urllib3 can perform decoding or decompression based on the HTTP `Content-Encoding` header (e.g., `gzip`, `deflate`, `br`, or `zstd`). When using the streaming API, the library decompresses only the necessary bytes, enabling partial content consumption. Starting in version 1.22 and prior to version 2.6.3, for HTTP redirect responses, the library would read the entire response body to drain the connection and decompress the content unnecessarily. This decompression occurred even before any read methods were called, and configured read limits did not restrict the amount of decompressed data. As a result, there was no safeguard against decompression bombs. A malicious server could exploit this to trigger excessive resource consumption on the client. Applications and libraries are affected when they stream content from untrusted sources by setting `preload_content=False` when they do not disable redirects. Users should upgrade to at least urllib3 v2.6.3, in which the library does not decode content of redirect responses when `preload_content=False`. If upgrading is not immediately possible, disable redirects by setting `redirect=False` for requests to untrusted source.", "cve_priority": "medium", "cve_public_date": "2026-01-07 22:15:00 UTC" } ], "launchpad_bugs_fixed": [ 2136906 ], "changes": [ { "cves": [ { "cve": "CVE-2025-66471", "url": "https://ubuntu.com/security/CVE-2025-66471", "cve_description": "urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.0 and prior to 2.6.0, the Streaming API improperly handles highly compressed data. urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. When streaming a compressed response, urllib3 can perform decoding or decompression based on the HTTP Content-Encoding header (e.g., gzip, deflate, br, or zstd). The library must read compressed data from the network and decompress it until the requested chunk size is met. Any resulting decompressed data that exceeds the requested amount is held in an internal buffer for the next read operation. The decompression logic could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This can result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data.", "cve_priority": "medium", "cve_public_date": "2025-12-05 17:16:00 UTC" } ], "log": [ "", " * SECURITY REGRESSION: Zstd issues after CVE-2025-66471 fix. (LP: #2136906)", " - debian/patches/CVE-2025-66471-fix1.patch: Revert zstd fix due to not", " being compatible with zstandard.", "" ], "package": "python-urllib3", "version": "2.3.0-2ubuntu0.4", "urgency": "medium", "distributions": "plucky-security", "launchpad_bugs_fixed": [ 2136906 ], "author": "Hlib Korzhynskyy ", "date": "Mon, 12 Jan 2026 17:21:47 -0330" }, { "cves": [ { "cve": "CVE-2026-21441", "url": "https://ubuntu.com/security/CVE-2026-21441", "cve_description": "urllib3 is an HTTP client library for Python. urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. urllib3 can perform decoding or decompression based on the HTTP `Content-Encoding` header (e.g., `gzip`, `deflate`, `br`, or `zstd`). When using the streaming API, the library decompresses only the necessary bytes, enabling partial content consumption. Starting in version 1.22 and prior to version 2.6.3, for HTTP redirect responses, the library would read the entire response body to drain the connection and decompress the content unnecessarily. This decompression occurred even before any read methods were called, and configured read limits did not restrict the amount of decompressed data. As a result, there was no safeguard against decompression bombs. A malicious server could exploit this to trigger excessive resource consumption on the client. Applications and libraries are affected when they stream content from untrusted sources by setting `preload_content=False` when they do not disable redirects. Users should upgrade to at least urllib3 v2.6.3, in which the library does not decode content of redirect responses when `preload_content=False`. If upgrading is not immediately possible, disable redirects by setting `redirect=False` for requests to untrusted source.", "cve_priority": "medium", "cve_public_date": "2026-01-07 22:15:00 UTC" } ], "log": [ "", " * SECURITY UPDATE: Decompression bomb in HTTP redirect responses.", " - debian/patches/CVE-2026-21441.patch: Add decode_content to self.read()", " in src/urllib3/response.py. Add tests in", " test/with_dummyserver/test_connectionpool.py and dummyserver/app.py.", " - CVE-2026-21441", "" ], "package": "python-urllib3", "version": "2.3.0-2ubuntu0.3", "urgency": "medium", "distributions": "plucky-security", "launchpad_bugs_fixed": [], "author": "Hlib Korzhynskyy ", "date": "Thu, 08 Jan 2026 14:53:20 -0330" } ], "notes": null, "is_version_downgrade": false }, { "name": "python3.13", "from_version": { "source_package_name": "python3.13", "source_package_version": "3.13.3-1ubuntu0.4", "version": "3.13.3-1ubuntu0.4" }, "to_version": { "source_package_name": "python3.13", "source_package_version": "3.13.3-1ubuntu0.5", "version": "3.13.3-1ubuntu0.5" }, "cves": [ { "cve": "CVE-2025-13836", "url": "https://ubuntu.com/security/CVE-2025-13836", "cve_description": "When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.", "cve_priority": "medium", "cve_public_date": "2025-12-01 18:16:00 UTC" } ], "launchpad_bugs_fixed": [], "changes": [ { "cves": [ { "cve": "CVE-2025-13836", "url": "https://ubuntu.com/security/CVE-2025-13836", "cve_description": "When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.", "cve_priority": "medium", "cve_public_date": "2025-12-01 18:16:00 UTC" } ], "log": [ "", " * SECURITY UPDATE: HTTP Content-Length denial of service", " - debian/patches/CVE-2025-13836.patch: Read large data in chunks with", " geometric reads in Lib/http/client.py and add tests in ", " Lib/test/test_httplib.py", " - CVE-2025-13836", "" ], "package": "python3.13", "version": "3.13.3-1ubuntu0.5", "urgency": "medium", "distributions": "plucky-security", "launchpad_bugs_fixed": [], "author": "Vyom Yadav ", "date": "Thu, 08 Jan 2026 17:33:54 +0530" } ], "notes": null, "is_version_downgrade": false }, { "name": "python3.13-minimal", "from_version": { "source_package_name": "python3.13", "source_package_version": "3.13.3-1ubuntu0.4", "version": "3.13.3-1ubuntu0.4" }, "to_version": { "source_package_name": "python3.13", "source_package_version": "3.13.3-1ubuntu0.5", "version": "3.13.3-1ubuntu0.5" }, "cves": [ { "cve": "CVE-2025-13836", "url": "https://ubuntu.com/security/CVE-2025-13836", "cve_description": "When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.", "cve_priority": "medium", "cve_public_date": "2025-12-01 18:16:00 UTC" } ], "launchpad_bugs_fixed": [], "changes": [ { "cves": [ { "cve": "CVE-2025-13836", "url": "https://ubuntu.com/security/CVE-2025-13836", "cve_description": "When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.", "cve_priority": "medium", "cve_public_date": "2025-12-01 18:16:00 UTC" } ], "log": [ "", " * SECURITY UPDATE: HTTP Content-Length denial of service", " - debian/patches/CVE-2025-13836.patch: Read large data in chunks with", " geometric reads in Lib/http/client.py and add tests in ", " Lib/test/test_httplib.py", " - CVE-2025-13836", "" ], "package": "python3.13", "version": "3.13.3-1ubuntu0.5", "urgency": "medium", "distributions": "plucky-security", "launchpad_bugs_fixed": [], "author": "Vyom Yadav ", "date": "Thu, 08 Jan 2026 17:33:54 +0530" } ], "notes": null, "is_version_downgrade": false } ], "snap": [] }, "added": { "deb": [], "snap": [] }, "removed": { "deb": [], "snap": [] }, "notes": "Changelog diff for Ubuntu 25.04 plucky image from release image serial 20260108 to 20260113", "from_series": "plucky", "to_series": "plucky", "from_serial": "20260108", "to_serial": "20260113", "from_manifest_filename": "release_manifest.previous", "to_manifest_filename": "manifest.current" }