EUVD-2026-29477
GHSA-r73h-97w8-m54h
Severity by source
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionCVE.org
Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in elixir-ecto postgrex ('Elixir.Postgrex.Notifications' module) allows SQL Injection.
The channel argument passed to 'Elixir.Postgrex.Notifications':listen/3 and 'Elixir.Postgrex.Notifications':unlisten/3 is interpolated directly into LISTEN "..." / UNLISTEN "..." SQL statements without escaping the " character. An attacker who can influence the channel name can inject a " to break out of the quoted identifier and append arbitrary SQL. Because the notifications connection uses the PostgreSQL simple query protocol, multi-statement payloads are accepted, allowing DDL and DML commands to be chained (e.g. ; DROP TABLE ...; --). The same unsanitized interpolation also occurs in handle_connect/1 when replaying LISTEN commands after a reconnect.
This vulnerability is associated with program file lib/postgrex/notifications.ex and program routines 'Elixir.Postgrex.Notifications':listen/3, 'Elixir.Postgrex.Notifications':unlisten/3, 'Elixir.Postgrex.Notifications':handle_connect/1.
This issue affects postgrex: from 0.16.0 before 0.22.2, from pkg:github/elixir-ecto/postgrex@266b530faf9bde094e31e0e4ab851f933fadc0f5 before 0.22.2.
AnalysisAI
SQL injection in the Elixir postgrex library allows local attackers with control over PostgreSQL LISTEN/UNLISTEN channel names to execute arbitrary SQL commands including DDL and DML operations. The Postgrex.Notifications module (versions 0.16.0 through 0.22.1) fails to escape double-quote characters in channel arguments, enabling attackers to break out of quoted identifiers and chain multi-statement payloads such as DROP TABLE commands. Vendor patch available in version 0.22.2 per GitHub advisory GHSA-r73h-97w8-m54h. No public exploit code or CISA KEV listing identified at time of analysis, though the technical details and patch diff are publicly disclosed.
Technical ContextAI
The postgrex library is the PostgreSQL database driver for the Elixir programming language, part of the elixir-ecto ecosystem. The vulnerability (CWE-89: SQL Injection) exists in the Postgrex.Notifications module within lib/postgrex/notifications.ex, specifically affecting the listen/3, unlisten/3, and handle_connect/1 functions. These functions construct LISTEN and UNLISTEN SQL commands by directly interpolating user-controlled channel names into quoted identifier strings without escaping the double-quote character. PostgreSQL's simple query protocol, used by the notifications connection, accepts multi-statement SQL separated by semicolons, enabling attackers to append arbitrary DDL and DML commands after breaking out of the identifier context with an unescaped quote. The patch implements proper quote escaping by replacing double-quotes with doubled double-quotes (standard SQL identifier escaping) and adds input validation rejecting null bytes and channel names exceeding PostgreSQL's 63-byte identifier limit.
RemediationAI
Upgrade postgrex to version 0.22.2 or later, which implements proper SQL identifier escaping and input validation per commit 7cdedbd4316bb65f82e6a9a4f922c0ac491cb770 available at https://github.com/elixir-ecto/postgrex/commit/7cdedbd4316bb65f82e6a9a4f922c0ac491cb770. Consult the official GitHub security advisory at https://github.com/elixir-ecto/ecto/security/advisories/GHSA-r73h-97w8-m54h for version-specific guidance. For environments unable to immediately upgrade, implement application-layer input validation: restrict channel names to alphanumeric characters and hyphens using regex pattern ^[a-zA-Z0-9_-]+$, enforce maximum 63-byte length, and reject any input containing double-quotes or null bytes before passing to listen/unlisten functions (note this workaround prevents legitimate use of special characters in channel names). Alternatively, maintain an allowlist of permitted channel names hardcoded in application logic, though this eliminates dynamic channel subscription capabilities. Review database user permissions for the postgrex connection to implement least-privilege access, limiting blast radius of successful SQL injection to non-critical tables and operations where feasible, though this compensating control does not prevent exploitation.
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External POC / Exploit Code
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