A program using swift-nio-http2 is vulnerable to a denial of service attack, caused by a network peer sending a specially crafted HTTP/2 frame. This vulnerability is caused by a logical error when parsing a HTTP/2 HEADERS or HTTP/2 PUSH_PROMISE frame where the frame contains padding information without any other data. This logical error caused confusion about the size of the frame, leading to a parsing error. This parsing error immediately crashes the entire process. Sending a HEADERS frame or PUSH_PROMISE frame with HTTP/2 padding information does not require any special permission, so any HTTP/2 connection peer may send such a frame. For clients, this means any server to which they connect may launch this attack. For servers, anyone they allow to connect to them may launch such an attack. The attack is low-effort: it takes very little resources to send an appropriately crafted frame. The impact on availability is high: receiving the frame immediately crashes the server, dropping all in-flight connections and causing the service to need to restart. It is straightforward for an attacker to repeatedly send appropriately crafted frames, so attackers require very few resources to achieve a substantial denial of service. The attack does not have any confidentiality or integrity risks in and of itself: swift-nio-http2 is parsing the frame in memory-safe code, so the crash is safe. However, sudden process crashes can lead to violations of invariants in services, so it is possible that this attack can be used to trigger an error condition that has confidentiality or integrity risks. The risk can be mitigated if untrusted peers can be prevented from communicating with the service. This mitigation is not available to many services. The issue is fixed by rewriting the parsing code to correctly handle the condition. The issue was found by automated fuzzing by oss-fuzz.

The ber_get_next function in libraries/liblber/io.c in OpenLDAP 2.4.42 and earlier allows remote attackers to cause a denial of service (reachable assertion and application crash) via crafted BER data, as demonstrated by an attack against slapd.

The xmlParseMisc function in parser.c in libxml2 before 2.9.3 allows context-dependent attackers to cause a denial of service (out-of-bounds heap read) via unspecified vectors related to incorrect entities boundaries and start tags.

libxpc in launchd in Apple OS X before 10.11 does not restrict the creation of processes for network connections, which allows remote attackers to cause a denial of service (resource consumption) by repeatedly connecting to the SSH port, a different vulnerability than CVE-2015-7761.

The checkint division routines in removefile in Apple iOS before 9 allow attackers to cause a denial of service (overflow fault and app crash) via crafted data.

Unspecified vulnerability in the _cg_TIFFSetField function in Mac OS X 10.4.6 and earlier, as used in applications that use ImageIO or AppKit, allows remote attackers to cause a denial of service (application crash) via a crafted TIFF image that triggers a null dereference.

Personal Web Sharing 1.5.5 allows a remote attacker to cause a denial of service via a long HTTP request.

Adobe Reader and Acrobat 10.x before 10.1.15 and 11.x before 11.0.12, Acrobat and Acrobat Reader DC Classic before 2015.006.30060, and Acrobat and Acrobat Reader DC Continuous before 2015.008.20082 on Windows and OS X allow attackers to cause a denial of service (NULL pointer dereference) via unspecified vectors, a different vulnerability than CVE-2015-4443.

Memory leak in WebKit.dll in WebKit, as used by Apple Safari 3.2 on Windows Vista SP1, allows remote attackers to cause a denial of service (memory consumption and browser crash) via a long ALINK attribute in a BODY element in an HTML document.

cupsd in CUPS 1.3.9 and earlier allows local users, and possibly remote attackers, to cause a denial of service (daemon crash) by adding a large number of RSS Subscriptions, which triggers a NULL pointer dereference. NOTE: this issue can be triggered remotely by leveraging CVE-2008-5184.

A vulnerability was found in openldap. This security flaw causes a null pointer dereference in ber_memalloc_x() function.

mDNSResponder in the Bonjour Namespace Provider in Apple Bonjour for Windows before 1.0.5 allows attackers to cause a denial of service (NULL pointer dereference and application crash) by resolving a crafted .local domain name that contains a long label.

Off-by-one error in the _web_drawInRect:withFont:ellipsis:alignment:measureOnly function in WebKit in Safari in Apple iPhone 1.1.4 and 2.0 and iPod touch 1.1.4 and 2.0 allows remote attackers to cause a denial of service (browser crash) via a JavaScript alert call with an argument that lacks breakable characters and has a length that is a multiple of the memory page size, leading to an out-of-bounds read.

Adobe Reader and Acrobat 10.x before 10.1.15 and 11.x before 11.0.12, Acrobat and Acrobat Reader DC Classic before 2015.006.30060, and Acrobat and Acrobat Reader DC Continuous before 2015.008.20082 on Windows and OS X allow attackers to cause a denial of service (NULL pointer dereference) via unspecified vectors, a different vulnerability than CVE-2015-4444.

Buffer overflow in WebObjects.exe in the WebObjects Developer 4.5 package allows remote attackers to cause a denial of service via an HTTP request with long headers such as Accept.

A denial of service issue was addressed with improved state handling. This issue is fixed in macOS Monterey 12.0.1. A remote attacker can cause a device to unexpectedly restart.

Macintosh systems generate large ICMP datagrams in response to malformed datagrams, allowing them to be used as amplifiers in a flood attack.

A null pointer dereference was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.4, Safari 14.1.1, iOS 14.6 and iPadOS 14.6. A remote attacker may be able to cause a denial of service.

Buffer overflow in Apple AppleShare Mail Server 5.0.3 on MacOS 8.1 and earlier allows a remote attacker to cause a denial of service (crash) via a long HELO command.

Novell NetWare 6.5 allows attackers to cause a denial of service (ABEND) via a crafted Macintosh iPrint client request.

Algorithmic complexity vulnerability in the multipart_buffer_headers function in main/rfc1867.c in PHP before 5.4.41, 5.5.x before 5.5.25, and 5.6.x before 5.6.9 allows remote attackers to cause a denial of service (CPU consumption) via crafted form data that triggers an improper order-of-growth outcome.

Buffer overflow in Apple Safari 3.0.3 522.15.5, and other versions before Beta Update 3.0.4, allows remote attackers to cause a denial of service (crash) and possibly have other unspecified impact by setting document.location.hash to a long string. NOTE: the crash might actually occur in the alert method.

The CUPS service, as used in SUSE Linux before 20070720 and other Linux distributions, allows remote attackers to cause a denial of service via unspecified vectors related to an incomplete fix for CVE-2007-0720 that introduced a different denial of service problem in SSL negotiation.

Apple Safari allows remote attackers to cause a denial of service (browser crash) via JavaScript that matches a regular expression against a long string, as demonstrated using /(.)*/.

The network interface for Apple AirPort Express 6.x before Firmware Update 6.3, and AirPort Extreme 5.x before Firmware Update 5.7, allows remote attackers to cause a denial of service (unresponsive interface) via malformed packets.

cache_util.c in the mod_cache module in Apache HTTP Server (httpd), when caching is enabled and a threaded Multi-Processing Module (MPM) is used, allows remote attackers to cause a denial of service (child processing handler crash) via a request with the (1) s-maxage, (2) max-age, (3) min-fresh, or (4) max-stale Cache-Control headers without a value.

The File Bookmark component in Apple OS X before 10.12 mishandles scoped-bookmark file descriptors, which allows attackers to cause a denial of service via a crafted app.

The CUPS service on multiple platforms allows remote attackers to cause a denial of service (service hang) via a "partially-negotiated" SSL connection, which prevents other requests from being accepted.

The _CFNetConnectionWillEnqueueRequests function in CFNetwork 129.19 on Apple Mac OS X 10.4 through 10.4.10 allows remote attackers to cause a denial of service (application crash) via a crafted HTTP 301 response, which results in a NULL pointer dereference.

Format string vulnerability in Apple Software Update 2.0.5 on Mac OS X 10.4.8 allows remote attackers to cause a denial of service (application crash) or execute arbitrary code via format string specifiers in (1) SWUTMP or (2) SUCATALOG filenames, or using the (3) application/x-apple.sucatalog+xml MIME type.

The SSH key generation process in OpenSSH in Apple Mac OS X 10.3.9 and 10.4 through 10.4.8 allows remote attackers to cause a denial of service by connecting to the server before SSH has finished creating keys, which causes the keys to be regenerated and can break trust relationships that were based on the original keys.

A denial-of-service issue was addressed with improved input validation. This issue is fixed in tvOS 16.3.2, iOS 16.3.1 and iPadOS 16.3.1, watchOS 9.3.1, macOS Ventura 13.2.1. Processing a maliciously crafted certificate may lead to a denial-of-service.

WebCore in Apple WebKit build 18794 allows remote attackers to cause a denial of service (null dereference and application crash) via a TD element with a large number in the ROWSPAN attribute, as demonstrated by a crash of OmniWeb 5.5.3 on Mac OS X 10.4.8, a different vulnerability than CVE-2006-2019.

ImageIO in Apple iOS before 9.3.3, OS X before 10.11.6, tvOS before 9.2.2, and watchOS before 2.2.2 allows remote attackers to cause a denial of service (memory consumption) via unspecified vectors.

The phar_parse_tarfile function in ext/phar/tar.c in PHP before 5.4.41, 5.5.x before 5.5.25, and 5.6.x before 5.6.9 does not verify that the first character of a filename is different from the \0 character, which allows remote attackers to cause a denial of service (integer underflow and memory corruption) via a crafted entry in a tar archive.

A mail header parsing issue was addressed with improved checks. This issue is fixed in iOS 18.7.2 and iPadOS 18.7.2, iOS 26.1 and iPadOS 26.1, macOS Sequoia 15.7.2, macOS Sonoma 14.8.2, macOS Tahoe 26.1, visionOS 26.1, watchOS 26.1. An attacker may be able to cause a persistent denial-of-service.

Buffer overflow in the JavaScript implementation in Safari on Apple Mac OS X 10.4 allows remote attackers to cause a denial of service (application crash) via a long argument to the exec method of a regular expression.

Adobe Reader and Acrobat 10.x before 10.1.14 and 11.x before 11.0.11 on Windows and OS X allow attackers to cause a denial of service (NULL pointer dereference) via unspecified vectors.

Apple Safari allows remote attackers to cause a denial of service (application crash) via a crafted data:// URL.

A null pointer dereference was addressed with improved validation. This issue affected versions prior to macOS High Sierra 10.13.6.

Improper access control for some Intel Unison software may allow an unauthenticated user to potentially enable denial of service via network access.

BIND before 9.2.6-P1 and 9.3.x before 9.3.2-P1 allows remote attackers to cause a denial of service (crash) via certain SIG queries, which cause an assertion failure when multiple RRsets are returned.

AFP Server in Apple Mac OS X 10.3.9 and 10.4.7 allows remote attackers to cause denial of service (crash) via an invalid AFP request that triggers an unchecked error condition.

An issue was discovered in certain Apple products. iOS before 11.3 is affected. macOS before 10.13.4 is affected. tvOS before 11.3 is affected. watchOS before 4.3 is affected. The issue involves the "CoreText" component. It allows remote attackers to cause a denial of service (application crash) via a crafted string.

A memory consumption issue was addressed with improved memory handling. This issue is fixed in iCloud for Windows 7.7, watchOS 5, Safari 12, iOS 12, iTunes 12.9 for Windows, tvOS 12. Unexpected interaction causes an ASSERT failure.

An issue was discovered in certain Apple products. iOS before 11.2.5 is affected. macOS before 10.13.3 is affected. watchOS before 4.2.2 is affected. The issue involves the "LinkPresentation" component. It allows remote attackers to cause a denial of service (resource consumption) via a crafted text message.

Integer overflow in ImageIO in Apple Mac OS X 10.4 up to 10.4.5 allows remote attackers to cause a denial of service (crash) via a crafted JPEG image with malformed JPEG metadata, as demonstrated using Safari, aka "Deja-Doom".

The WebTextRenderer(WebInternal) _CG_drawRun:style:geometry: function in Apple Safari 2.0.3 allows remote attackers to cause a denial of service (application crash) via an HTML LI tag with a large VALUE attribute (list item number), which triggers a null dereference in QPainter::drawText, probably due to a failed memory allocation that uses the VALUE.

runtime/JSONObject.cpp in JavaScriptCore in WebKit, as distributed in Safari Technology Preview Release 18, allows remote attackers to cause a denial of service (segmentation violation and application crash) via crafted JavaScript code that triggers a "type confusion" in the JSON.stringify function.

SQLite 3.25.2, when queries are run on a table with a malformed PRIMARY KEY, allows remote attackers to cause a denial of service (application crash) by leveraging the ability to run arbitrary SQL statements (such as in certain WebSQL use cases).