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CVE-2022-31019

DoS Vulnerability in URLEncodedFormDecoder in Vapor

Vapor is a server-side Swift HTTP web framework. When using automatic content decoding an attacker can craft a request body that can make the server crash with the following request: `curl -d "array[_0][0][array][_0][0][array]$(for f in $(seq 1100); do echo -n '[_0][0][array]'; done)[string][_0]=hello%20world" http://localhost:8080/foo`. The issue is unbounded, attacker controlled stack growth which will at some point lead to a stack overflow and a process crash. This issue has been fixed in version 4.61.1.

CVSS 3.1 · 7.5 High EPSS 1.7% KEV · Not listed
Vendors
Vapor
Products
Vapor
CVE-2022-31005

Integer Overflow in Vapor's HTTP Range Request

Vapor is an HTTP web framework for Swift. Users of Vapor prior to version 4.60.3 with FileMiddleware enabled are vulnerable to an integer overflow vulnerability that can crash the application. Version 4.60.3 contains a patch for this issue. As a workaround, disable FileMiddleware and serve via a Content Delivery Network.

CVSS 3.1 · 7.5 High EPSS 2.1% KEV · Not listed
Vendors
Vapor
Products
Vapor
CVE-2026-27120

Leaf-kit html escaping does not work on characters that are part of extended grapheme cluster

Leafkit is a templating language with Swift-inspired syntax. Prior to 1.4.1, htmlEscaped in leaf-kit will only escape html special characters if the extended grapheme clusters match, which allows bypassing escaping by using an extended grapheme cluster containing both the special html character and some additional characters. In the case of html attributes, this can lead to XSS if there is a leaf variable in the attribute that is user controlled. This vulnerability is fixed in 1.4.1.

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Vendors
Vapor
Products
Leafkit
CVE-2026-28499

LeafKit's HTML escaping may be skipped for Collection values, enabling XSS

LeafKit is a templating language with Swift-inspired syntax. Prior to version 1.14.2, HTML escaping doesn't work correctly when a template prints a collection (Array / Dictionary) via `#(value)`. This can result in XSS, allowing potentially untrusted input to be rendered unescaped. Version 1.14.2 fixes the issue.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Vapor
Products
Leafkit
CVE-2023-31136

PostgresNIO processes unencrypted bytes from man-in-the-middle

PostgresNIO is a Swift client for PostgreSQL. Any user of PostgresNIO prior to version 1.14.2 connecting to servers with TLS enabled is vulnerable to a man-in-the-middle attacker injecting false responses to the client's first few queries, despite the use of TLS certificate verification and encryption. The vulnerability is addressed in PostgresNIO versions starting from 1.14.2. There are no known workarounds for unpatched users.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Vendors
Vapor
Products
Postgresnio
CVE-2024-21631

Integer overflow in URI leading to potential host spoofing

Vapor is an HTTP web framework for Swift. Prior to version 4.90.0, Vapor's `vapor_urlparser_parse` function uses `uint16_t` indexes when parsing a URI's components, which may cause integer overflows when parsing untrusted inputs. This vulnerability does not affect Vapor directly but could impact applications relying on the URI type for validating user input. The URI type is used in several places in Vapor. A developer may decide to use URI to represent a URL in their application (especially if that URL is then passed to the HTTP Client) and rely on its public properties and methods. However, URI may fail to properly parse a valid (albeit abnormally long) URL, due to string ranges being converted to 16-bit integers. An attacker may use this behavior to trick the application into accepting a URL to an untrusted destination. By padding the port number with zeros, an attacker can cause an integer overflow to occur when the URL authority is parsed and, as a result, spoof the host. Version 4.90.0 contains a patch for this issue. As a workaround, validate user input before parsing as a URI or, if possible, use Foundation's `URL` and `URLComponents` utilities.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Vapor
Products
Vapor
CVE-2023-44386

Incorrect request error handling triggers server crash in Vapor

Vapor is an HTTP web framework for Swift. There is a denial of service vulnerability impacting all users of affected versions of Vapor. The HTTP1 error handler closed connections when HTTP parse errors occur instead of passing them on. The issue is fixed as of Vapor release 4.84.2.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Vapor
Products
Vapor
CVE-2021-37634

LeafKit allows XSS with untrusted user input

Leafkit is a templating language with Swift-inspired syntax. Versions prior to 1.3.0 are susceptible to Cross-site Scripting (XSS) attacks. This affects anyone passing unsanitised data to Leaf's variable tags. Before this fix, Leaf would not escape any strings passed to tags as variables. If an attacker managed to find a variable that was rendered with their unsanitised data, they could inject scripts into a generated Leaf page, which could enable XSS attacks if other mitigations such as a Content Security Policy were not enabled. This has been patched in 1.3.0. As a workaround sanitize any untrusted input before passing it to Leaf and enable a CSP to block inline script and CSS data.

CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed
Vendors
Vapor
Products
Leafkit