# Pydantic AI: Unbounded memory use when downloading remote content via web_fetch or FileUrl Advisory record · `GHSA-v2xh-2vp8-57h8` - **Identifiers:** `GHSA-v2xh-2vp8-57h8` · `CVE-2026-107294` · `PYSEC-2026-4280` · `PYSEC-2026-4289` - **State:** Confirmed - **Severity:** CVSS 6.5 Medium - **Critical:** No - **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html) · [CWE-770](https://cwe.mitre.org/data/definitions/770.html) - **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md) - **Published:** 8 Oct 2026 - **Updated:** 15 Oct 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 8 Oct 2026, 17:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `pydantic-ai` (PyPI): affected `>=1.77.0, <1.107.2 || >=2.0.0b1, <2.24.0`; fixed in `1.107.2`, `2.24.0` - `pydantic-ai-slim` (PyPI): affected `>=1.77.0, <1.107.2 || >=2.0.0b1, <2.24.0`; fixed in `1.107.2`, `2.24.0` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > Pydantic AI (pydantic-ai and pydantic-ai-slim) versions 1.77.0 up to 1.107.2 and 2.0.0b1 up to 2.24.0 are affected. An attacker who can send untrusted prompts to an application that exposes the local web-fetch tool, or who can influence large FileUrl downloads, can make it fetch a URL that streams a very large response, exhausting memory and crashing the process. Upgrade to pydantic-ai 2.24.0 or pydantic-ai 1.107.2, or the matching pydantic-ai-slim version. The patched versions cap downloads at 50 MiB by default. Written 1 Nov 2026. ## Not analysed yet We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check. ## Severity and exploitation - 6.5 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`, from CNA (GitHub_M) - **CISA KEV:** Not listed. - **EPSS:** 0.0044, the 38th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 31 Oct 2026, 14:08 UTC: First seen by agentprime - 31 Oct 2026, 14:08 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-v2xh-2vp8-57h8) ## Sources - [GitHub Advisory Database: GHSA-v2xh-2vp8-57h8](https://github.com/advisories/GHSA-v2xh-2vp8-57h8) - [OSV: GHSA-v2xh-2vp8-57h8](https://osv.dev/vulnerability/GHSA-v2xh-2vp8-57h8) - - - - - - - - Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code. ## Check whether this affects you A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet. - With the agentprime MCP server (), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .