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BREW-dynaconf-CVE-2026-33154 — dynaconf Affected by Remote Code Execution (RCE) via Insecure Template Evaluation in @jinja Resolver

Affected: Homebrew: dynaconf

### Summary Dynaconf is vulnerable to Server-Side Template Injection (SSTI) due to unsafe template evaluation in the @jinja resolver. When the jinja2 package is installed, Dynaconf evaluates template expressions embedded in configuration values without a sandboxed environment.

If an attacker can influence configuration sources such as: environment variables .env files container environment configuration CI/CD secrets they can execute arbitrary OS commands on the host system. In addition, the @format resolver allows object graph traversal, which may expose sensitive runtime objects and environment variables.

### Details The vulnerability arises because Dynaconf's string resolvers lack proper security boundaries.

1. @jinja Resolver The @jinja resolver renders templates using full Jinja2 evaluation. However, the rendering context is not sandboxed, which allows attackers to access Python's internal attributes. Using objects such as cycler, attackers can reach Python's __globals__ and import the os module.

Example attack path cycler → __init__ → __globals__ → os → popen() This leads to arbitrary command execution.

2. @format Resolver The @format resolver performs Python string formatting using internal objects. This allows attackers to traverse Python's object graph and access sensitive runtime objects. Example traversal: {this.__class__.__init__.__globals__[os].environ} This can expose - API keys - database credentials - internal service tokens - environment secrets

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EUVD-2026-277819

fkie_cve-2026-33154

dynaconf is a configuration management tool for Python. Prior to version 3.2.13, Dynaconf is vulnerable to Server-Side Template Injection (SSTI) due to unsafe template evaluation in the @Jinja resolver. When the jinja2 package is installed, Dynaconf evaluates template expressions embedded in configuration values without a sandboxed environment. This issue has been patched in version 3.2.13.

GHSA-pxrr-hq57-q35p — dynaconf Affected by Remote Code Execution (RCE) via Insecure Template Evaluation in @jinja Resolver

Affected: PyPI: dynaconf

### Details The vulnerability arises because Dynaconf's string resolvers lack proper security boundaries.

Example attack path cycler → __init__ → __globals__ → os → popen() This leads to arbitrary command execution.

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openSUSE-SU-2026:10411-1 — python311-dynaconf-3.2.13-1.1 on GA media

python311-dynaconf-3.2.13-1.1 on GA media

PYSEC-2026-2147

Affected: PyPI: dynaconf

RHSA-2026:13545 — Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Container Release Update

crypto/tls: crypto/tls: Incorrect certificate validation during TLS session resumption aiohttp: aiohttp: Denial of Service via specially crafted POST request aiohttp: aiohttp: Denial of Service via memory exhaustion from crafted POST request ansible-lightspeed: Broken Object Level Authorization Leading to Cross-User AI Conversation Context Injection in Ansible Lightspeed API lodash: lodash: Arbitrary code execution via untrusted input in template imports path-to-regexp: path-to-regexp: Denial of Service via crafted regular expressions aap-controller: aap-gateway: Account hijacking and unauthorized access via unverified email linking aap-gateway: missing requestHeadersToRemove allows mTLS bypass via Subject header spoofing pyasn1: pyasn1: Denial of Service due to memory exhaustion from malformed RELATIVE-OID wheel: wheel: Privilege Escalation or Arbitrary Code Execution via malicious wheel file unpacking net/url: Incorrect parsing of IPv6 host literals in net/url cryptography: cryptography Subgroup Attack Due to Missing Subgroup Validation for SECT Curves crypto/x509: Incorrect enforcement of email constraints in crypto/x509 pyOpenSSL: DTLS cookie callback buffer overflow rollup: Rollup: Remote Code Execution via Path Traversal Vulnerability svgo: SVGO: Denial of Service via XML entity expansion pyasn1: pyasn1 Vulnerable to Denial of Service via Unbounded Recursion quinn-proto: quinn-proto: Denial of Service via crafted QUIC Initial packet black: Black: Arbitrary file writes…

UBUNTU-CVE-2026-33154

Affected: Ubuntu:Pro:22.04:LTS: python-dynaconf, Ubuntu:24.04:LTS: python-dynaconf, Ubuntu:25.10: python-dynaconf, Ubuntu:Pro:26.04:LTS: python-dynaconf