EUVD-2026-87828
GHSA-j62x-q9gf-62p4
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network SSRF by an authenticated workflow author (PR:L); AC:H because it depends on a workflow using a caller-controlled image URL and/or IPv6-encoding tricks; scope change with limited internal-data disclosure (C:L), no integrity/availability impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
Heym versions 0.0.90 and earlier contain two server-side request forgery (SSRF) egress gaps, both remediated in app/services/ssrf_guard.py in 0.0.91. First, the LLM image-edit input loader (_load_image_bytes) fetched caller-controlled HTTP/HTTPS URLs with a bare httpx.get, applying only a scheme check and bypassing the egress-pinning HTTP client; because the workflow DSL supports "imageInput": "$userInput.body.imageUrl", a webhook or API caller can choose the fetch target when a workflow author uses that expression, allowing requests to loopback, RFC1918, and cloud metadata endpoints. Second, _is_public_address unwrapped only IPv4-mapped IPv6 addresses, so IPv6 transition forms - the NAT64 well-known prefix 64:ff9b::/96, deprecated IPv4-compatible ::x.x.x.x addresses, and 6to4 (2002::/16, classified as globally routable by Python 3.11.0 through 3.11.9) - could carry loopback, RFC1918, link-local, or cloud-metadata IPv4 destinations past both the initial URL validation and the dial-time IP pin. Version 0.0.91 routes the image loader through guard_http_url and the guarded client, evaluates NAT64 and IPv4-compatible addresses by their embedded IPv4 address, and refuses 64:ff9b:1::/48, 6to4, and Teredo (2001::/32) outright.
AnalysisAI
Server-side request forgery in Heym 0.0.90 and earlier lets a caller-controlled workflow input steer an outbound HTTP fetch to loopback, RFC1918, link-local, or cloud metadata endpoints such as 169.254.169.254. Two distinct egress gaps exist: the LLM image-edit loader (_load_image_bytes) issues a bare httpx.get that skips the egress-pinning client, and _is_public_address only unwraps IPv4-mapped IPv6, so NAT64 (64:ff9b::/96), IPv4-compatible (::x.x.x.x), and 6to4 (2002::/16) encodings can smuggle internal IPv4 destinations past both URL validation and the dial-time IP pin. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a Heym workflow authored to source the image-edit input from a caller-controlled expression such as `"imageInput": "$userInput.body.imageUrl"`; without such a workflow the caller cannot choose the fetch target. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but modest-severity SSRF issue best treated as low-to-medium priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to Heym 0.0.91, which is the vendor-released fix for both egress gaps: it routes _load_image_bytes through guard_http_url and the guarded egress-pinning client, evaluates NAT64 and IPv4-compatible addresses by their embedded IPv4 value, and hard-refuses 64:ff9b:1::/48, 6to4, and Teredo (2001::/32). … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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