Low severity3.1NVD Advisory· Published Apr 24, 2026· Updated Apr 28, 2026
CVE-2026-41488
CVE-2026-41488
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
langchain-openaiPyPI | < 1.1.14 | 1.1.14 |
Affected products
2Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-r7w7-9xr2-qq2rghsaADVISORY
- github.com/langchain-ai/langchain/security/advisories/GHSA-r7w7-9xr2-qq2rnvdMitigationVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-41488ghsaADVISORY
- github.com/pypa/advisory-database/tree/main/vulns/langchain-openai/PYSEC-2026-76.yamlghsaWEB
News mentions
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