CVE-2026-26013Network attack vector

Blind SSRF via unvalidated image token counting

Published Feb 10, 2026 · Updated Feb 10, 2026

SSRF in LangChain before 1.2.11 allows remote attackers to make application servers request arbitrary URLs via crafted image URLs. ChatOpenAI.get_num_tokens_from_messages() passes non-low-detail image_url values to _url_to_size(), which calls httpx.get() without validating the destination. Reachability requires an application to token-count attacker-controlled vision messages; the blind requests can access internal services or consume limited resources, but responses are not returned.

CVSS severity3.7
Low
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in LangChain before 1.2.11 allows remote attackers to make application servers request arbitrary URLs via crafted image URLs. ChatOpenAI.get_num_tokens_from_messages() passes non-low-detail image_url values to _url_to_size(), which calls httpx.get() without validating the destination. Reachability requires an application to token-count attacker-controlled vision messages; the blind requests can access internal services or consume limited resources, but responses are not returned.

The record

CVE
CVE-2026-26013
Published
Feb 10, 2026
Updated
Feb 10, 2026
Vendor
LangChain
Product
LangChain
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.2.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LangChain · LangChainversion=< 1.2.11

Published CVSS scores

3.7GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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