CVE-2026-46634

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 66% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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__ 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 v3
9.8
EG Score
9.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
34.3%
KEV
Not listed

Published

May 21, 2026

Last Modified

July 16, 2026

Advisory Details (3)

Auto-updated Jul 16, 2026
Patch available. Sources: github_release, github, github_commit.
github Patch Available

`template_from_string()` escapes a SourcePolicy-driven sandbox via synthesized template name · Advisory · twigphp/Twig · GitHub

https://github.com/twigphp/Twig/security/advisories/GHSA-24x9-r6q4-q93w
github_release Patch Available

v3.26.0

Patch available: twigphp/Twig v3.26.0

https://github.com/twigphp/Twig/releases/tag/v3.26.0
github_commit Patch Available

commit 1cde8f2b6246 (twigphp/Twig)

Patch available: twigphp/Twig v3.26.0 (contains commit 1cde8f2b6246)

https://github.com/twigphp/Twig/commit/1cde8f2b62463f85d47995fc25f8241cb409d915

Vendor Advisories for CVE-2026-46634(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
twig/twigv3.10.0 ... v3.9.3 (32 versions)3.26.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 16× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-24 14:17 UTCEPSS rescore
  2. 2026-07-23 14:18 UTCEPSS rescore
  3. 2026-07-23 03:17 UTCEG score recompute▲ 2.10
  4. 2026-07-22 14:08 UTCEPSS rescore
  5. 2026-07-21 15:24 UTCEPSS rescore
  6. 2026-07-20 17:08 UTCEPSS rescore
  7. 2026-07-19 14:31 UTCEPSS rescore
  8. 2026-07-19 02:29 UTCEPSS rescore
  9. 2026-07-18 10:04 UTCEPSS rescore
  10. 2026-07-16 17:03 UTCEPSS rescore
  11. 2026-07-16 06:26 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  12. 2026-07-16 04:28 UTCMITRE cvelistV5CVSS v3 → 7.7 · severity → HIGH
  13. 2026-07-15 20:58 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  14. 2026-07-15 16:57 UTCEPSS rescore
  15. 2026-07-14 21:36 UTCEG score recompute▲ 7.70
  16. 2026-07-14 21:35 UTCMITRE cvelistV5CVSS v3 → 7.7 · CVSS v4 → 7.7 · severity → HIGH
  17. 2026-06-14 23:18 UTCEPSS rescore
  18. 2026-06-13 23:00 UTCEPSS rescore
  19. 2026-06-12 23:12 UTCEPSS rescore
  20. 2026-05-24 06:10 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-46634?
CVE-2026-46634 is a critical vulnerability published on May 21, 2026. Twig is a template language for PHP. From 3.9.0 until 3.26.0, templatefromstring() compiles an inner template under a synthesized stringtemplate<hash> name that can fall outside a SourcePolicyInterface sandbox decision, allowing a sandboxed template that can call templatefrom_string and include to…
When was CVE-2026-46634 disclosed?
CVE-2026-46634 was first published in the National Vulnerability Database on May 21, 2026, with the most recent update on July 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-46634 actively exploited?
CVE-2026-46634 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 34.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-46634?
CVE-2026-46634 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-46634?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-46634, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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