CVE-2026-53508— oasdiff does not enforce --allow-external-refs=false on the git-revision load path (SSRF / local file read)
Quick assessment
Affected
oasdiff oasdiff
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
oasdiff 是一个命令行工具和 Go 包，用于比较 OpenAPI 规范并检测其中的破坏性变更。 从 1.13.2 版本到 1.18.0 版本，当通过 git 修订版本加载规范（即 形式，例如 ）时，oasdiff 未强制应用 （对应库中 ）。在该加载路径下，即使显式禁用了外部引用，外部 仍会被解析，导致该缓解措施在此场景下未生效。 该问题已在 1.18.1 版本中修复。
Possible ATT&CK Techniques 1 AI
T1565 · Data Manipulation
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I. Basic Information for CVE-2026-53508
Vulnerability Information
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Vulnerability Title
oasdiff does not enforce --allow-external-refs=false on the git-revision load path (SSRF / local file read)
Source: CVE Program / CVE List V5
Vulnerability Description
oasdiff is a command-line and Go package that compares and detects breaking changes in OpenAPI specs. From version 1.13.2 through version 1.18.0, oasdiff did not enforce --allow-external-refs=false (library: openapi3.Loader.IsExternalRefsAllowed = false) when loading a spec from a git revision (the rev:path form, e.g. main:openapi.yaml). External $refs were resolved on that load path even when external refs were explicitly disabled, so the mitigation silently did not apply there. This issue has been patched in version 1.18.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
文件名或路径的外部可控制
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-53508
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Other References for CVE-2026-53508 (4)
IV. Related Vulnerabilities
Same weakness: CWE-73
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NLTK through 3.10.3 Path Traversal via Model-Artifact APIs
V. Comments for CVE-2026-53508
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