9.8

CVE-2026-46634: symfony twig Protection Mechanism Failure

CVSS: 9.8v3.1CriticalAnalyzed
AliasesUBUNTU-CVE-2026-46634DEBIAN-CVE-2026-46634CGA-4qgh-f8gf-5q4g
Published 14-07-2026Last modified 29-07-2026
Open JSON

Vulnerability summary

CVE-2026-46634 is a critical (CVSS 9.8) Protection Mechanism Failure vulnerability in symfony twig. EPSS estimates a 0.62% chance of exploitation in the next 30 days, higher than 48.5% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
0.62%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-WV5F-4RVF-M364

Timeline

  1. 14-07-2026
    PublishedVulnerability first disclosed.
  2. 29-07-2026
    Last modifiedVulnerability information updated.

Description

Twig is a template language for PHP. From 3.9.0 until 3.26.0, template_from_string() compiles an inner template under a synthesized __string_template__<hash> name that can fall outside a SourcePolicyInterface sandbox decision, allowing a sandboxed template that can call template_from_string and include to render an inner template without security policy enforcement. This issue is fixed in version 3.26.0.

CVSS metrics

7 scores · 5 sources · 2 versions

EPSS trend

Probability

0.62%

Chance of exploitation in the next 30 days

Percentile

49%

Versus all other CVEs

30-day change

0.00 pp

From 0.62% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.62%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard1 product
  • drupal-11.3< 11.3.10-r0
Debian1 product
  • php-twig< 3.27.0-0+deb13u1 | < 3.26.0-1
Symfony1 product
  • twig≥ 3.9.0, < 3.26.0
Twigphp1 product
  • twig≥ 3.9.0, < 3.26.0
Ubuntu1 product
  • php-twigAll versions (No fix recorded)

5 vendors · 5 products

References

9 links