How severe is GHSA-p42q-9prx-q5wq?

No CVSS score has been assigned to GHSA-p42q-9prx-q5wq yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-p42q-9prx-q5wq?

GHSA-p42q-9prx-q5wq affects the following packages: twig/twig (Packagist). Ecosystems affected: Packagist.

How do I fix GHSA-p42q-9prx-q5wq?

Update twig/twig to 3.27.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-p42q-9prx-q5wq is resolved across your whole dependency graph.

How do I detect GHSA-p42q-9prx-q5wq in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for twig/twig, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-p42q-9prx-q5wq if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is GHSA-p42q-9prx-q5wq actively exploited in the wild?

No public exploit code has been indexed for GHSA-p42q-9prx-q5wq yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-p42q-9prx-q5wq?

GHSA-p42q-9prx-q5wq has an EPSS (Exploit Prediction Scoring System) score of 0.5%, placing it in the 40th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-p42q-9prx-q5wq?

GHSA-p42q-9prx-q5wq is classified as CWE-693 (CWE-693). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-p42q-9prx-q5wq published, and has it been updated?

GHSA-p42q-9prx-q5wq was published on June 30, 2026 and was last updated on September 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘 Packagist

Not in CISA KEV

Twig: Sandbox state regression in deprecated internal wrappers in `src/Resources/core.php`GHSA-p42q-9prx-q5wq

GHSA-p42q-9prx-q5wq is a CWE-693 vulnerability in twig/twig. A fix is available for twig/twig — see the affected versions and patch details below.

Also known asCVE-2026-48805

Published

Jun 30, 2026

Updated

Sep 10, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Oct 15, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
A successful exploit gives an attacker total control of the affected component, not partial access.
CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-p42q-9prx-q5wq.

EPSS Exploitation Probability

via FIRST.org ↗

0.5%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs40th percentile — riskier than 40% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

🐘twig/twig

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

The 3.26.0 source-policy hardening changed the signature of CoreExtension::checkArrow() to take a boolean $isSandboxed instead of an Environment, and added the same $isSandboxed argument to CoreExtension::arraySome() and CoreExtension::arrayEvery(). Compiled templates were updated to pass the per-source sandbox state computed at the call site.

The deprecated internal wrappers exposed in src/Resources/core.php for legacy third-party code (twig_check_arrow_in_sandbox(), twig_array_some(), twig_array_every()) were not updated:

twig_array_some() and twig_array_every() call CoreExtension::arraySome() / arrayEvery() without forwarding the sandbox state. The underlying methods default $isSandboxed to false, so the callable-must-be-a-Closure restriction is silently bypassed in sandbox mode and a string callable such as 'strcmp' is accepted.
twig_check_arrow_in_sandbox() passes the Environment object where CoreExtension::checkArrow() now expects a bool, which throws a TypeError on PHP 8+.

Compiled Twig templates are not affected: they call CoreExtension::* directly with the correct arguments. Applications are only impacted if they still call the deprecated twig_* helpers on top of a sandboxed Environment.

Resolution

The three wrappers now resolve the current sandbox state via twig_resolve_is_sandboxed() (the same helper compiled templates use), and forward it to the corresponding CoreExtension::* method. twig_check_arrow_in_sandbox() no longer triggers a TypeError, and twig_array_some() / twig_array_every() now enforce the same sandbox restriction as compiled templates.

Credits

We would like to thank El Kharoubi Iosif for reporting the issue and Fabien Potencier for providing the fix.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`twig/twig`	all versions	3.27.0`composer require twig/twig:^3.27.0`

Affected Products

1 product · 1 configurations

Application

twigsymfony

< 3.27.0

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for twig/twig, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update twig/twig to 3.27.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-p42q-9prx-q5wq is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### Description The 3.26.0 source-policy hardening changed the signature of `CoreExtension::checkArrow()` to take a boolean `$isSandboxed` instead of an `Environment`, and added the same `$isSandboxed` argument to `CoreExtension::arraySome()` and `CoreExtension::arrayEvery()`. Compiled templates were updated to pass the per-source sandbox state computed at the call site. The deprecated internal wrappers exposed in `src/Resources/core.php` for legacy third-party code (`twig_check_arrow_in_sandbox()`, `twig_array_some()`, `twig_array_every()`) were not updated: - `twig_array_some()` and `twig

O3 Security · Impact-Aware SCA

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Twig: Sandbox state regression in deprecated internal wrappers in `src/Resources/core.php`GHSA-p42q-9prx-q5wq

Exploitation Status

No confirmed exploitation observed yet

EPSS Exploitation Probability

Real-World Exposure

Description

Description

Resolution

Credits

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

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