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CVE-2026-46633 twigphp CVE debrief

CVE-2026-46633 is a high-severity vulnerability in Twig, a template language for PHP. The vulnerability exists in the Compiler::string() method, which does not escape single quotes when a template name from a {% use %} tag is placed inside a PHP single-quoted string literal. This allows a crafted template name to terminate the string and inject arbitrary PHP expressions into the compiled cache file. The CVE record was published on 2026-07-14T22:16:55.997Z and has not been modified since then. Developers and administrators using Twig should be aware of this vulnerability and take necessary actions to mitigate it.

Vendor
twigphp
Product
Twig
CVSS
HIGH 8.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-16
Advisory published
2026-07-14
Advisory updated
2026-07-16

Who should care

Developers and administrators using Twig, a template language for PHP, should be aware of this high-severity vulnerability. They should review their code and upgrade to version 3.26.0 or later to mitigate this vulnerability. Additionally, they should review and validate template names used in {% use %} tags and implement additional security measures to prevent template injection attacks.

Technical summary

CVE-2026-46633 is a high-severity vulnerability in Twig, a template language for PHP. Prior to version 3.26.0, the Compiler::string() method does not escape single quotes when a template name from a {% use %} tag is placed inside a PHP single-quoted string literal. This allows a crafted template name to terminate the string and inject arbitrary PHP expressions into the compiled cache file. The vulnerability is fixed in version 3.26.0. Developers and administrators using Twig should upgrade to version 3.26.0 or later to mitigate this vulnerability.

Defensive priority

High

Recommended defensive actions

  • Upgrade to Twig version 3.26.0 or later
  • Review and validate template names used in {% use %} tags
  • Implement additional security measures to prevent template injection attacks
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-14T22:16:55.997Z and has not been modified since then. The NVD entry is currently Analyzed. There are no additional details available about the vulnerability beyond what is provided in the CVE record and NVD entry.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-46633 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-46633

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-46633 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-46633

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.