Nuxt OG Image cache poisoning through derivable cache keys on unsigned dynamic image routes

**Vendor:** Nuxt **Product:** Nuxt OG Image **Version:** 6.2.5 **Description:** Due to the specifics of caching and key generation in the Open Graph image cache created by the module, an unauthenticated attacker can modify the content of the image (for example, the `title` parameter) that is delivered to the user. **Impact:** Content Spoofing **Vulnerable component:** route `/_og/d/*.png` **Exploitation conditions:** Access to the application **Mitigation:** Upgrade to 6.7.2 and set a sufficiently secure `secret` in config `ogImage` **Researcher:** Dmitry Vanin (Positive Technologies) ## Research During [the previous vulnerability research](https://github.com/nuxt-modules/og-image/security/advisories/GHSA-6c86-prf5-hj4h), it was discovered that version 6.2.5 changed the mechanism for generating cache indexes; it now takes into account the parameters passed during image generation. However, the image is still generated from data transmitted to the attacker. _Listing 1. New code for generating indexes in cache_ ``` export function resolvePathCacheKey(e: H3Event, path: string, resolvedOptions?: Record<string, any>) { const siteConfig = getSiteConfig(e, { resolveRefs: true, }) const basePath = withoutTrailingSlash(withoutLeadingSlash(normalizeKey(path))) const hashParts: any[] = [ basePath, import.meta.prerender ? '' : siteConfig.url, ] // Hash resolved options (not raw query string) so unknown/extra query params // cannot produce unique cache keys and bypass the cache. if (resolvedOptions) hashParts.push(hash(resolvedOptions)) return [ (!basePath || basePath === '/') ? 'index' : basePath, hash(hashParts), ].join(':') } ``` In this case, `basePath` is obtained from the `_path` parameter, `resolvedOptions` are the normalized settings of the component, for example: _Listing 2. An example of `resolvedOptions`_ ``` {"emojis":"noto","extension":"png","width":1200,"height":600,"cacheMaxAgeSeconds":259200,"component":"OgImageDefaultImageTakumi"} ``` From the analysis of `resolvedOptions`, it was concluded that, in general, all parameters are known either from the direct link to the OG Image or from the server response. ## Vulnerability reproduction 1. Find the route to OG Image. _Figure 1. Demonstration of finding the route to OG Image_ <img width="974" height="361" alt="image" src="https://github.com/user-attachments/assets/d3ee6b54-d545-4a3b-8cbf-f82df99ed4d0" /> 2. Retrieve parameters from the server’s response, especially `cacheMaxAgeSeconds` (`cache-control` header, `s-maxage` key), the other parameters are known from the meta tags as well as from the `c_<component name>` parameter. _Figure 2. Obtaining parameters_ <img width="974" height="245" alt="image" src="https://github.com/user-attachments/assets/84a4cd8b-9281-47ef-b524-0047a0f6077a" /> 3. Generate a cache key using a script. _Listing 3. Srcipt_ ``` import {hash} from "ohash"; var url = "https://contoso.com" var obj = JSON.parse(`{"emojis":"noto","extension":"png","width":1200,"height":600,"cacheMaxAgeSeconds":259200,"component":"OgImageBlogPostTakumi"}`) var basePath = '/' var hashParts = [ basePath, url ] if (obj) hashParts.push(hash(obj)) console.log([ (!basePath || basePath === '/') ? 'index' : basePath, hash(hashParts), ].join(':')) ``` 4. Repeat the steps as in [the vulnerability 1](https://github.com/nuxt-modules/og-image/security/advisories/GHSA-6c86-prf5-hj4h), but transmit the obtained `cacheKey` in addition. 5. Thus, the same result as in [the vulnerability 1](https://github.com/nuxt-modules/og-image/security/advisories/GHSA-6c86-prf5-hj4h) was obtained. _Figure 4. Server response_ <img width="974" height="729" alt="image" src="https://github.com/user-attachments/assets/5895c0e8-e497-410d-bef9-f6f2f9649261" /> ## Credits Researcher: Dmitry Vanin (Positive Technologies)

Source published

15 Oct 2026 20:15:27 UTC

Source modified

15 Oct 2026 20:30:08 UTC

Observed here

24 Oct 2026 13:17:17 UTC

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GitHub Advisory Database · CC-BY-4.0

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CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

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