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CVE-2024-51502

Panic Vulnerability in loona-hpack

5.1 MediumFix available

loona is an experimental, HTTP/1.1 and HTTP/2 implementation in Rust on top of io-uring. loona-hpack suffers from the same vulnerability as the original hpack as documented in issue #11. All users who try to decode untrusted input using the Decoder are vulnerable to this exploit. This issue has been addressed in release version 0.4.3. All users are advised to upgrade. There are no known workarounds for this vulnerability.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
Passive

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
Low

Exploit likelihood

0.48%Up 0.4 points since Nov 5, 2024
90%50%10%1%

What each source reports

CVE List Score used 5.1

Panic Vulnerability in loona-hpack

loona is an experimental, HTTP/1.1 and HTTP/2 implementation in Rust on top of io-uring. loona-hpack suffers from the same vulnerability as the original hpack as documented in issue #11. All users who try to decode untrusted input using the Decoder are vulnerable to this exploit. This issue has been addressed in release version 0.4.3. All users are advised to upgrade. There are no known workarounds for this vulnerability.

Record
CVE-2024-51502
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-755
Updated
2026-11-02
EUVDEUVD-2024-3214 5.1

loona is an experimental, HTTP/1.1 and HTTP/2 implementation in Rust on top of io-uring. loona-hpack suffers from the same vulnerability as the original hpack as documented in issue #11. All users who try to decode untrusted input using the Decoder are vulnerable to this exploit. This issue has been addressed in release version 0.4.3. All users are advised to upgrade. There are no known workarounds for this vulnerability.

Record
EUVD-2024-3214
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-7vm6-qwh5-9x44 5.1

loona-hpack Panic Vulnerability

Summary

loona-hpack suffers from the same vulnerability as the original hpack as documented in https://github.com/mlalic/hpack-rs/issues/11

Details

The original includes a very nice description of the problem, as well as an easy-enough fix for it.

PoC

The original example pretty much still applies:

use loona_hpack::Decoder;

pub fn main() {
    let input = &[0x3f];
    let mut decoder = Decoder::new();
    let _ = decoder.decode(input);
}

Impact

From the original: All users who try to decode untrusted input using the Decoder are vulnerable to this exploit. A patched version of the crate is available on [crates.io](https://crates.io/crates/hpack-patched) under the name hpack-patched. See [Cargo's documentation on overriding dependencies](https://doc.rust-lang.org/cargo/reference/overriding-dependencies.html) for more information.

Record
GHSA-7vm6-qwh5-9x44
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-754, CWE-755
Updated
2026-11-02
NVD 5.1

loona is an experimental, HTTP/1.1 and HTTP/2 implementation in Rust on top of io-uring. loona-hpack suffers from the same vulnerability as the original hpack as documented in issue #11. All users who try to decode untrusted input using the Decoder are vulnerable to this exploit. This issue has been addressed in release version 0.4.3. All users are advised to upgrade. There are no known workarounds for this vulnerability.

Record
CVE-2024-51502
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/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
Weakness
CWE-755
Updated
2026-11-02
OSV 5.1

Panic Vulnerability in loona-hpack

loona is an experimental, HTTP/1.1 and HTTP/2 implementation in Rust on top of io-uring. loona-hpack suffers from the same vulnerability as the original hpack as documented in issue #11. All users who try to decode untrusted input using the Decoder are vulnerable to this exploit. This issue has been addressed in release version 0.4.3. All users are advised to upgrade. There are no known workarounds for this vulnerability.

Record
CVE-2024-51502
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-755
Updated
2026-11-02
OSVGHSA-7vm6-qwh5-9x44 5.1

loona-hpack Panic Vulnerability

Summary

loona-hpack suffers from the same vulnerability as the original hpack as documented in https://github.com/mlalic/hpack-rs/issues/11

Details

The original includes a very nice description of the problem, as well as an easy-enough fix for it.

PoC

The original example pretty much still applies:

use loona_hpack::Decoder;

pub fn main() {
    let input = &[0x3f];
    let mut decoder = Decoder::new();
    let _ = decoder.decode(input);
}

Impact

From the original: All users who try to decode untrusted input using the Decoder are vulnerable to this exploit. A patched version of the crate is available on [crates.io](https://crates.io/crates/hpack-patched) under the name hpack-patched. See [Cargo's documentation on overriding dependencies](https://doc.rust-lang.org/cargo/reference/overriding-dependencies.html) for more information.

Record
GHSA-7vm6-qwh5-9x44
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-754, CWE-755
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
loona-hpack
crates.io
through 0.4.2
0.4.3
loona-hpack
crates.io
before 0.4.3
0.4.3

History

History
RecordedChangedSources
aliases, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2024-51502 is a medium vulnerability (CVSS 5.1) in Bearcove Loona, published November 4, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.48%, the 41st percentile. Fixed in loona-hpack 0.4.3.

References

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