actix-files before 0.6.10 Denial of Service via empty Range header

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

actix-files before 0.6.10 contains a denial of service vulnerability triggered by an empty Range header in GET requests for static files. When panic is set to abort, remote attackers can crash the process on-demand by sending a GET request with an empty Range header.

Source published

14 Aug 2026 11:35:26 UTC

Source modified

29 Oct 2026 21:16:48 UTC

Observed here

29 Oct 2026 22:48:55 UTC

Source terms

CVE Program Terms of Use

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

actix-files before 0.6.10 contains a denial of service vulnerability triggered by an empty Range header in GET requests for static files. When panic is set to abort, remote attackers can crash the process on-demand by sending a GET request with an empty Range header.

Source published

Aug 14, 2026, 11:35:26 AM (timezone not stated)

Source modified

Oct 29, 2026, 9:16:48 PM (timezone not stated)

Observed here

5 Nov 2026 13:40:40 UTC

Source terms

ENISA EUVD · source terms and attribution apply

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EUVD CVSS 4.0 · 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

actix-files before 0.6.10 contains a denial of service vulnerability triggered by an empty Range header in GET requests for static files. When panic is set to abort, remote attackers can crash the process on-demand by sending a GET request with an empty Range header.

Source published

14 Aug 2026 12:16:44 UTC

Source modified

29 Oct 2026 21:17:32 UTC

Observed here

31 Oct 2026 18:05:17 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · [email protected] · Secondary · 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/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

### Summary A GET request for a static file served by `actix-files` with an empty `Range` header triggers a panic. With `panic = "abort"`, a remote user may crash the process on-demand. ### Details `actix-files` assumes that `HttpRange::parse()`, when `Ok`, always returns a vector with at least one element. When `parse()` is called on an empty string, it returns `Ok(vec![])`. This can cause a panic at named.rs:534 when handling an HTTP request with an empty `Range:` header. This shouldn't significantly impact programs built with the default `panic = "unwind"`, as the only effect is that the connection is closed when the worker thread panics and new threads are spooled up on demand. Programs built with `panic = "abort"` are vulnerable to being crashed on-demand by any user with permissions to perform a `GET` request for a static file served by `actix-files`. https://github.com/actix/actix-web/blob/0383f4bdd1210e726143ca1ebcf01169b67a4b6c/actix-files/src/named.rs#L530-L535 ### PoC <details> <summary>Minimal reproduction</summary> `Cargo.toml`: ```toml [package] name = "example" version = "0.1.0" edition = "2021" [dependencies] actix-web = "=4.5.1" actix-files = "=0.6.5" [profile.dev] panic = "abort" ``` `src/main.rs`: ```rust use actix_files::NamedFile; use actix_web::{get, Responder}; #[get("/")] async fn index() -> impl Responder { NamedFile::open("test_file") } #[actix_web::main] async fn main() -> std::io::Result<()> { use actix_web::{App, HttpServer}; HttpServer::new(|| App::new().service(index)) .bind(("127.0.0.1", 8080))? .run() .await } ``` `test.sh`: ```sh #!/bin/bash echo foo > test_file cargo b cargo r& sleep 1 nc 127.0.0.1 8080 << EOF GET / HTTP/1.1 Range: EOF kill %1 ``` Create these files, then run `chmod +x test.sh && ./test.sh`. The server should start, then crash upon receiving the `GET` request from `netcat`. This assumes a reasonably UNIX-like system with Rust, `bash` and `netcat` installed. </details> ### Impact It is believed that only programs compiled with panic = "abort" are affected significantly. The only potential impact that can be seen is Denial of Service, though an attacker able to repeatedly send GET requests without those requests getting blocked by rate limiting, DDoS protection, etc. would be able to keep a server down indefinitely. As only a single unblocked request is needed to trigger the panic, merely having a rate limiter may not be enough to prevent this. Though the impact in the worst case is significant, the real-world risk of this vulnerability appears to be limited, as it would be expected that anyone for whom uptime is a significant concern would not compile their program with panic = "abort".

Source published

6 Feb 2026 19:00:12 UTC

Source modified

10 Sep 2026 03:50:34 UTC

Observed here

24 Oct 2026 13:19:54 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

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

Publisher rating · MODERATE