twig/intl-extra: Unbounded formatter memoisation in keyed on template-controlled arguments

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

2.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U · score source

EPSS

• CVE-2026-46629: 0.54% estimated exploitation activity in the next 30 days; percentile 45.62 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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 formatdatetime / formatdate / formattime / formatnumber / formatcurrency filters. There is no size limit and no eviction. A template that iterates over many distinct pattern (or locale, or groupingused, ...) 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 memorylimit. 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…

Published by the source

21 May 2026, 21:23 UTC

Last modified by the source

21 May 2026, 21:23 UTC

Source last checked

26 Oct 2026, 14:40 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-35wc-cvqg-78fp

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# Patch Next advisory brief: CVE-2026-46629

Advisory: twig/intl-extra: Unbounded formatter memoisation in keyed on template-controlled arguments
IDs: CVE-2026-46629, GHSA-35wc-cvqg-78fp
Record: https://patchnext.com/advisories/cve-2026-46629 (revision 1, source checked 26 Oct 2026, 14:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 2.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: twig/intl-extra 3.26.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist twig/intl-extra: affected < 3.26.0; fixed in 3.26.0

## Suggested inspection (read-only)
- Packagist twig/intl-extra: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on twig/intl-extra.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-35wc-cvqg-78fp (GitHub-reviewed advisory GHSA-35wc-cvqg-78fp lists affected ranges: Packagist twig/intl-extra >=0 <3.26.0)

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