CVE-2026-41488
CVE-2026-41488 is a low-severity vulnerability in Langchain Langchain-openai with a CVSS 3.x base score of 3.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.
Key facts
- Severity: Low (CVSS 3.x base score 3.1)
- EPSS exploit prediction: 0% (14th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-25635
- Weakness: CWE-918
- Affected product: Langchain Langchain-openai
- Published:
- Last modified:
Description
LangChain is a framework for building agents and LLM-powered applications. Prior to 1.1.14, langchain-openai's _url_to_size() helper (used by get_num_tokens_from_messages for image token counting) validated URLs for SSRF protection and then fetched them in a separate network operation with independent DNS resolution. This left a TOCTOU / DNS rebinding window: an attacker-controlled hostname could resolve to a public IP during validation and then to a private/localhost IP during the actual fetch.
Frequently asked questions
- What is CVE-2026-41488?
- LangChain is a framework for building agents and LLM-powered applications. Prior to 1.1.14, langchain-openai's _url_to_size() helper (used by get_num_tokens_from_messages for image token counting) validated URLs for SSRF protection and then fetched them in a separate network operation with independent DNS resolution. This left a TOCTOU / DNS rebinding window: an attacker-controlled hostname could resolve to a public IP during validation and then to a private/localhost IP during the actual fetch.
- How severe is CVE-2026-41488?
- CVE-2026-41488 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.
- Is CVE-2026-41488 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-41488?
- CVE-2026-41488 affects Langchain Langchain-openai. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-41488?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-41488 have an EU (EUVD) identifier?
- Yes. CVE-2026-41488 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25635.
- When was CVE-2026-41488 published?
- CVE-2026-41488 was published on 2026-04-24 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:langchain:langchain-openai:*:*:*:*:*:*:*:*
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