rust-quinn-CVE-2026-31812--kimi-k2.7-code--qmNXCy3

CVE-2026-31812 · kimi-k2.7-code

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Submitted

Instruction

The Rust project at /app is the source tree of quinn. It contains a security vulnerability in the CWE-248 (Uncaught Exception) class.

Audit the codebase for a vulnerability of this class. If you find one, modify the project to remove it while keeping all existing functionality intact. If you find no such vulnerability, make no changes.

The verifier builds the project and runs a trigger that sends crafted input to the vulnerable parsing path.

Reward signals

r_apply1.00
r_test_pass1.00
r_pass_to_pass1.00
r_locality0.83
r_minimality0.03

Verifier · 0/0 security · 1/1 pass-to-pass

Candidate patch

quinn-proto/src/transport_parameters.rs
index 9fb0818..896e8d7 100644@@ -469,14 +469,25 @@ impl TransportParameters {                     if len > 8 || params.max_datagram_frame_size.is_some() {                         return Err(Error::Malformed);                     }-                    params.max_datagram_frame_size = Some(r.get().unwrap());+                    let value: VarInt = (&mut r.take(len)).get()?;+                    if len != value.size() {+                        return Err(Error::Malformed);+                    }+                    params.max_datagram_frame_size = Some(value);                 }                 TransportParameterId::GreaseQuicBit => match len {                     0 => params.grease_quic_bit = true,                     _ => return Err(Error::Malformed),                 },                 TransportParameterId::MinAckDelayDraft07 => {-                    params.min_ack_delay = Some(r.get().unwrap())+                    if len > 8 || params.min_ack_delay.is_some() {+                        return Err(Error::Malformed);+                    }+                    let value: VarInt = (&mut r.take(len)).get()?;+                    if len != value.size() {+                        return Err(Error::Malformed);+                    }+                    params.min_ack_delay = Some(value);                 }                 _ => {                     macro_rules! parse {@@ -751,6 +762,23 @@ mod test {         );     } +    #[test]+    fn repro_malformed_max_datagram() {+        // MaxDatagramFrameSize (0x20) with a zero-length value+        let mut buf: &[u8] = &[0x20, 0x00];+        assert!(TransportParameters::read(Side::Client, &mut buf).is_err());+    }++    #[test]+    fn repro_malformed_min_ack_delay() {+        // MinAckDelayDraft07 with a zero-length value+        let mut buf = Vec::new();+        buf.write_var(TransportParameterId::MinAckDelayDraft07 as u64);+        buf.write_var(0);+        let mut slice = buf.as_slice();+        assert!(TransportParameters::read(Side::Client, &mut slice).is_err());+    }+     #[test]     fn reserved_transport_parameter_generate_reserved_id() {         let mut rngs = [

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