CVE-2026-46636

HIGH

8.7

CVSS v4

Description

Twig is a template language for PHP. From version 1.0.0 to before version 3.27.0, SecurityPolicy::checkMethodAllowed() unconditionally whitelists all method calls on instances of Twig\Markup. Twig\Markup is not final, so subclasses inherit the bypass. An application that passes an object of a Markup-derived class into a sandboxed template (typically to mark a chunk of HTML as safe) inadvertently exposes every public method of that subclass to template authors, regardless of the configured allowedMethods list. This issue has been patched in version 3.27.0.

CWE-1336

How to fix

Remediation Available

php-twigDebian

Fixed in:3.27.0-0+deb13u1CVE-2026-46636

Fixed in:3.27.0-1CVE-2026-46636

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v4 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

Impact

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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

Exploit Intelligence

0.36%probability of exploitation in 30 days

29thpercentile

Low risk: more likely to be exploited than 29% of all known CVEs.

References

Other references5

Related Vulnerabilities

Other CWE-1336 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-4040	Critical	9.8	100%	KEV	Fix
CVE-2024-23692	Critical	9.8	99%	KEV + Ransom	-
CVE-2025-47916	Critical	10.0	84%	-	Fix
CVE-2024-32651	Critical	10.0	84%	-	-
CVE-2025-34300	Unscored	-	79%	-	-
CVE-2022-25813	High	7.5	67%	-	Fix

Common questions

How do I fix CVE-2026-46636?

Upgrade php-twig on debian 13 to 3.27.0-0+deb13u1 or later.

Is CVE-2026-46636 being actively exploited?

Not that we know of. CVE-2026-46636 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.36% is the estimated probability that it will be exploited in the next 30 days. That is higher than 29% of all scored CVEs.

How severe is CVE-2026-46636?

CVE-2026-46636 has a CVSS v4 base score of 8.7, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-46636 affect?

Published advisories record a fix for php-twig (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-08.