HSEC-2026-0010 Improper parsing of fractional NumericDate from JWT exp claims

Improper parsing of fractional NumericDate from JWT exp claims Since its initial commit, package jwt uses Data.Scientific.coefficientscientific to extract the fractional mantissa in a way that improperly discards the exponent. This can lead to incorrect parsing of the exp claim in JWT payload bod...

HSEC-2026-0008 crypton-x509-validation and crypton-x509 do not enforce X.509 Name Constraints

crypton-x509-validation and crypton-x509 do not enforce X.509 Name Constraints The crypton-x509-validation and crypton-x509 libraries did not enforce the X.509 Name Constraints extension during certificate validation. The Name Constraints extension is a critical X.509 extension that restricts the...

HSEC-2026-0007 Denial of Service and Memory Exhaustion in aeson

Denial of Service and Memory Exhaustion in aeson A Denial of Service DoS and memory exhaustion vulnerability was identified in the aeson package. The vulnerability allows an attacker to exhaust server memory and crash the host process by supplying maliciously crafted JSON payloads. The...

HSEC-2026-0006 Cabal deletes project source files during configure

Cabal deletes project source files during configure The checkDuplicateHeaders function in Distribution.Simple.Configure removes header files from the source directory when a header with the same name exists in both the build directory and the source directory. This behavior was introduced in comm...

HSEC-2026-0004 Hackage package metadata stored XSS vulnerability

Hackage package metadata stored XSS vulnerability User-controlled metadata from .cabal files are rendered into HTML href attributes without proper sanitization, enabling stored Cross-Site Scripting XSS attacks. The specific fields affected are: - homepage - bug-reports - source-repository.locatio...

HSEC-2024-0004 Hackage package and doc upload stored XSS vulnerability

Hackage package and doc upload stored XSS vulnerability Author: Fraser Tweedale Haskell SRT Executive summary A critical XSS vulnerability affected hackage-server and hackage.haskell.org. HTML and JavaScript files provided in source packages or via the documentation upload facility were served...

HSEC-2025-0007 cmark-gfm: resource exhaustion due to quadratic complexity in parser

cmark-gfm: resource exhaustion due to quadratic complexity in parser cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. A polynomial time complexity issue in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service, due to...

HSEC-2025-0006 Private key leak via inherited file descriptor

Private key leak via inherited file descriptor The X.509 key reading function readKeyFile opened a file descriptor to the private key without setting the close-on-exec flag. If a child process is execed at the same time, it would inherit that file descriptor and could read the private key materia...

HSEC-2023-0003 code injection in xmonad-contrib

code injection in xmonad-contrib The XMonad.Hooks.DynamicLog module in xmonad-contrib before 0.11.2 allows remote attackers to execute arbitrary commands via a web page title, which activates the commands when the user clicks on the xmobar window title, as demonstrated using an action tag...

HSEC-2025-0001 Subword division operations may produce incorrect results

Subword division operations may produce incorrect results Arithmetic operations may produce incorrect results when compiled with optimizations. For the most part, this bug only causes availability and data integrity issues. However, in some circumstances, it may result in other, more complicated...

HSEC-2023-0004 xml-conduit unbounded entity expansion

xml-conduit unbounded entity expansion A vulnerability was found in xml-conduit. It has been classified as problematic. Affected is an unknown function of the file xml-conduit/src/Text/XML/Stream/Parse.hs of the component DOCTYPE Entity Expansion Handler. The manipulation leads to infinite loop. ...

HSEC-2024-0006 fromIntegral: conversion error

fromIntegral: conversion error fromIntegral may result in coercion errors when used with optimization flags -O1 or -O2 in the following situation: - Converting negative Int to Natural does not throw an arithmetic underflow error - Converting large Integer greater than 2^64 to Natural overflow. Fo...

HSEC-2024-0008 Sign extension error in the PPC64le FFI

Sign extension error in the PPC64le FFI Numeric arguments of FFI call on the PPC64le backend may result in incorrect runtime values. For the most part, this bug only causes availability and data integrity issues. However, in some circumstances, it may result in other, more complicated security...

HSEC-2025-0004 Broken Path Sanitization in spacecookie Library

Broken Path Sanitization in spacecookie Library The spacecookie library exposes the functions sanitizePath and sanitizeIfNotUrl intended to remove .. components from paths which can be used to prevent path traversal attacks. Due to erroneous comparison code, this elimination is not actually...

HSEC-2023-0012 git-annex checksum exposure to encrypted special remotes

git-annex checksum exposure to encrypted special remotes A bug exposed the checksum of annexed files to encrypted special remotes, which are not supposed to have access to the checksum of the un-encrypted file. This only occurred when resuming uploads to the encrypted special remote, so it is...

HSEC-2024-0001 Reflected XSS vulnerability in keter

Reflected XSS vulnerability in keter Keter is an app-server/reverse-proxy often used with webapps build on Yesod web-framework. In the logic handling VHost dispatch, Keter was echoing back Host header value, unescaped, as part of an HTML error page. This constitutes a reflected-XSS vulnerability...

HSEC-2023-0007 readFloat: memory exhaustion with large exponent

readFloat: memory exhaustion with large exponent Numeric.readFloat takes time and memory linear in the size of the number denoted by the input string. In particular, processing a number expressed in scientific notation with a very large exponent could cause a denial of service. The slowdown is...

HSEC-2023-0002 Improper Verification of Cryptographic Signature

Improper Verification of Cryptographic Signature The Biscuit specification version 1 contains a vulnerable algorithm that allows malicious actors to forge valid Γ-signatures. Such an attack would allow an attacker to create a token with any access level. The version 2 of the specification mandate...

HSEC-2025-0002 Double Public Key Signing Function Oracle Attack on Ed25519

Double Public Key Signing Function Oracle Attack on Ed25519 The standard specification of Ed25519 message signing involves providing the algorithm with a message and private key. The function will use the private key to compute the public key and sign the message. Some libraries provide a variant...

HSEC-2024-0003 process: command injection via argument list on Windows

process: command injection via argument list on Windows The process library on Windows is vulnerable to a command injection vulnerability, via cmd.exe's interpretation of arguments. Programs that invoke batch files .bat, .cmd and pass arguments whose values are affected by program inputs may be...

HSEC-2023-0008 Stored XSS in hledger-web

Stored XSS in hledger-web An issue was discovered in hledger-web 1.23. A Stored Cross-Site Scripting XSS vulnerability exists in toBloodhoundJson that allows an attacker to execute JavaScript by encoding user-controlled values in a payload with base64 and parsing them with the atob function...

HSEC-2025-0003 Use after free in multithreaded lzma (.xz) decoder

Use after free in multithreaded lzma .xz decoder In XZ Utils 5.3.3alpha to 5.8.0, the multithreaded .xz decoder in liblzma has a bug where invalid input can at least result in a crash CVE-2025-31115. The effects include heap use after free and writing to an address based on the null pointer plus ...

HSEC-2023-0013 git-annex plaintext storage of embedded credentials on encrypted remotes

git-annex plaintext storage of embedded credentials on encrypted remotes git-annex had a bug in the S3 and Glacier remotes where if embedcreds=yes was set, and the remote used encryption=pubkey or encryption=hybrid, the embedded AWS credentials were stored in the Git repository in effectively...

HSEC-2023-0001 Hash flooding vulnerability in aeson

Hash flooding vulnerability in aeson aeson was vulnerable to hash flooding a.k.a. hash DoS. The issue is a consequence of the HashMap implementation from unordered-containers. It results in a denial of service through CPU consumption. This technique has been used in real-world attacks against a...

HSEC-2023-0015 cabal-install uses expired key policies

cabal-install uses expired key policies A problem was recently discovered in cabal-install's implementation of the Hackage Security protocol that would allow an attacker who was in possession of a revoked private key and who could perform a man-in-the-middle attack against Hackage to use the...

HSEC-2025-0005 cabal-install dependency confusion

cabal-install dependency confusion For cabal-install 3.4.0.0 and where multiple repositories are configured, the resolver picks the highest available version across all repositories. Where a package is only defined in a private repository, this behaviour leads to a dependency confusionblog supply...

HSEC-2023-0011 git-annex GPG decryption attack via compromised remote

git-annex GPG decryption attack via compromised remote A malicious server for a special remote could trick git-annex into decrypting a file that was encrypted to the user's GPG key. This attack could be used to expose encrypted data that was never stored in git-annex. Daniel Dent discovered this...

HSEC-2023-0014 Arbitrary file write is possible when using PDF output or --extract-media with untrusted input

Arbitrary file write is possible when using PDF output or --extract-media with untrusted input Pandoc is susceptible to an arbitrary file write vulnerability, which can be triggered by providing a specially crafted image element in the input when generating files using the --extract-media option ...

HSEC-2023-0009 git-annex command injection via malicious SSH hostname

git-annex command injection via malicious SSH hostname git-annex was vulnerable to the same class of security hole as git's CVE-2017-1000117. In several cases, git-annex parses a repository URL, and uses it to generate a ssh command, with the hostname to ssh to coming from the URL. If the hostnam...

HSEC-2024-0002 out-of-bounds write when there are many bzip2 selectors

out-of-bounds write when there are many bzip2 selectors A malicious bzip2 payload may produce a memory corruption resulting in a denial of service and/or remote code execution. Network services or command line utilities decompressing untrusted bzip2 payloads are affected. Note that the exploitati...