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CVE-2026-46629 medium CVSS 6.5

Vulnerability in twig/intl-extra (CVE-2026-46629)

Summary

Vulnerability in twig/intl-extra (CVE-2026-46629). Risk of unauthorized operations or information disclosure. Exploitable via IntlExtension. Mitigation: upgrade to 3.26.0 or later.

Original description

The description as published by the source.

Description

IntlExtension memoises every \IntlDateFormatter and \NumberFormatter it creates in instance-level arrays keyed on a hash that includes locale, pattern, attrs and other values that are ordinary named arguments of the format_datetime / format_date / format_time / format_number / format_currency filters. There is no size limit and no eviction.

A template that iterates over many distinct pattern (or locale, or grouping_used, ...) values therefore allocates one ICU formatter object per distinct value and pins it for the entire lifetime of the Twig\Environment. Because ICU allocates its backing buffers outside the Zend memory manager, this growth is not bounded by memory_limit. On long-running runtimes (RoadRunner, Swoole, FrankenPHP worker mode, ReactPHP) where the Environment outlives a single request, the cache also accumulates across requests.

Resolution

The formatter caches are now bounded in size (100 entries each) and evict on a FIFO basis.

Credits

Twig would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue and providing the fix.

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-46629 has been found in twig/intl-extra.
Attackers can target a specific entry point like IntlExtension over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 6.5/10.
What to do: upgrade twig/intl-extra to 3.26.0 or later.
If unsure, ask your IT team or search "twig/intl-extra CVE-2026-46629" on the vendor's site.

CVE-2026-46629 (twig/intl-extra) — CWE-770 / CVSS v3 6.5
Attack vector: remote (network-reachable) / no user interaction
Attack surface: IntlExtension / locale / pattern / attrs
Patched: 3.26.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-770) exists in twig/intl-extra. Attackers reach the vulnerable code path via IntlExtension.

📍 Affected scope

Check the vendor advisory for the affected versions of twig/intl-extra. Attack surface: IntlExtension / locale / pattern / attrs.

🔥 Severity

Severity: Medium (CVSS 6.5/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 3.26.0.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'twig/intl-extra' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'twig/intl-extra' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で twig/intl-extra を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade twig/intl-extra to 3.26.0

    ステージング環境で 3.26.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

composer twig/intl-extra
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.26.0"}]}]
Packagist twig/intl-extra
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.26.0"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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