CVE-2026-107460 Apache Fesod (Incubating): UrlImageConverter SSRF protection bypass via DNS rebinding
Attacker bypasses SSRF protection in Apache Fesod via DNS rebinding to access restricted internal resources when remote image fetching is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-107460?
CVE-2026-107460 is a critical server-side request forgery vulnerability in Apache Fesod (Incubating), published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Server-Side Request Forgery (SSRF) protection in the UrlImageConverter component of Apache Fesod (Incubating) fesod-sheet 2.0.2-incubating can be bypassed through DNS rebinding. When an application accepts an attacker-controlled image URL for spreadsheet writing, the converter checks the hostname's resolved IP addresses and then opens a separate connection that can resolve the hostname again. An attacker who controls DNS responses for the URL hostname may cause the connection to reach a restricted address after validation. CVE-2026-49328 covers SSRF in releases before 2.0.2-incubating; this issue is a DNS rebinding bypass of the protection in 2.0.2-incubating. Apache Fesod (Incubating) 2.1.0-incubating addresses the reported default-fetch scenario by disabling remote URL image fetching by default and requiring an explicit exact-host allowlist when the feature is enabled. Users should upgrade to 2.1.0-incubating. Applications enabling remote URL image fetching should allowlist only hostnames whose DNS and HTTP services are trusted.
Weakness: CWE-918
Which versions are affected by CVE-2026-107460?
How do I fix CVE-2026-107460?
No fix has been published for CVE-2026-107460 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-107460 being exploited?
There is no known exploitation of CVE-2026-107460 in the wild and no public exploit code.
Sources
Also known as GHSA-vf6f-333q-84g4.