CVE-2026-107289

MEDIUMPre-NVD 6.86.8—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (23rd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.56.0 until 1.107.6 and 2.44.0, applications that opt attacker-influenced URLs into local network access through FileUrl with force_download='allow-local' or web_fetch_tool with allow_local_urls=True can bypass the cloud-metadata blocklist by appending an IPv6 zone identifier to an IPv6 metadata address. IPv6Address equality and hashing include the zone identifier, so the blocklist comparison fails even though the network stack ignores the zone on a non-link-local destination and reaches the metadata service, potentially exposing cloud IAM credentials. The opt-in settings are disabled by default, and the issue requires an IPv6-enabled environment. This issue is fixed in versions 1.107.6 and 2.44.0.

CVSS v3
6.8
EG Score
6.8MEDIUMmedium confidence
EG Risk
35
EG Risk 35/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity68% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
23rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 8, 2026

Last Modified

October 8, 2026

Advisory Details (7)

Auto-updated Oct 8, 2026
Patch available. Sources: github_release, github, github_pr, github_commit.
github_release Patch Available

v2.44.0 (2026-09-16)

Patch available: pydantic/pydantic-ai v2.44.0

https://github.com/pydantic/pydantic-ai/releases/tag/v2.44.0
github_release Patch Available

v1.107.6 (2026-09-16)

Patch available: pydantic/pydantic-ai v1.107.6

https://github.com/pydantic/pydantic-ai/releases/tag/v1.107.6
github_commit Patch Available

commit 4da70591460f (pydantic/pydantic-ai)

Patch available: pydantic/pydantic-ai v1.107.6 (contains commit 4da70591460f)

https://github.com/pydantic/pydantic-ai/commit/4da70591460f51a8c4f128eaeef70a33340dbd55
github_commit Patch Available

commit 02157e1b87bd (pydantic/pydantic-ai)

Patch available: pydantic/pydantic-ai v2.44.0 (contains commit 02157e1b87bd)

https://github.com/pydantic/pydantic-ai/commit/02157e1b87bd45d3f2e111ce07afdf89f9fb0e5b
github_pr Patch Available

Normalize IPv6 zone identifiers in URL validation (v1 backport)

Patch available: pydantic/pydantic-ai v1.107.6 (PR #8402 merged 2026-09-16)

https://github.com/pydantic/pydantic-ai/pull/8402
github_pr Patch Available

Normalize IPv6 zone identifiers in URL validation

Patch available: pydantic/pydantic-ai v2.44.0 (PR #8401 merged 2026-09-16)

https://github.com/pydantic/pydantic-ai/pull/8401
githubMentions a patch (unverified)

SSRF cloud-metadata blocklist bypass via IPv6 zone identifiers · Advisory · pydantic/pydantic-ai · GitHub

https://github.com/pydantic/pydantic-ai/security/advisories/GHSA-vmxc-h2x2-jmf3

Vendor Advisories for CVE-2026-107289(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(2 across 1 ecosystem)
PyPI(2)
PackageVulnerable rangeFix by version rangeDependents
pydantic-ai1.100.0 ... 1.99.0 (62 versions)
  • 1.56.0 up to 1.107.6: fixed in 1.107.6
  • 2.0.0b1 up to 2.44.0: fixed in 2.44.0
—
pydantic-ai-slim1.100.0 ... 1.99.0 (62 versions)
  • 1.56.0 up to 1.107.6: fixed in 1.107.6
  • 2.0.0b1 up to 2.44.0: fixed in 2.44.0
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 5× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-09 22:33 UTCEG score recompute
  2. 2026-10-09 20:06 UTCEPSS rescore
  3. 2026-10-08 16:25 UTCEG score recompute
  4. 2026-10-08 15:37 UTCEG score recompute
  5. 2026-10-08 15:36 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-107289?
CVE-2026-107289 is a medium vulnerability published on October 8, 2026. Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 1.56.0 until 1.107.6 and 2.44.0, applications that opt attacker-influenced URLs into local network access through FileUrl with forcedownload='allow-local' or webfetchtool with…
When was CVE-2026-107289 disclosed?
CVE-2026-107289 was first published on October 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-107289 actively exploited?
CVE-2026-107289 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (23rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-107289?
CVE-2026-107289 has a CVSS base score of 6.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-107289?
A fix for CVE-2026-107289 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-107289 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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