Distribution advisory
This page covers CVE-2024-43398 as tracked by Ubuntu, for the package ruby2.3. The fix is available in version 2.7.0-5ubuntu1.16; earlier versions remain affected.
How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.
CVSS metrics in full
The score comes from this vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Attack vector: Network — reachable from anywhere that can route to the service.
- Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
- Privileges required: None — an unauthenticated stranger can try it.
- User interaction: None — nobody has to be tricked into anything.
- Scope: Unchanged — the damage stays inside the vulnerable component.
- Confidentiality impact: None.
- Integrity impact: None.
- Availability impact: High — total loss, or loss the attacker controls.
Weakness class
UBUNTU-CVE-2024-43398 is classified as CWE-776: XML Entity Expansion. Nested entity definitions expand enormously when parsed, consuming memory and CPU.
Affected software
UBUNTU-CVE-2024-43398 is recorded against 5 packages.
- ruby2.3
- ruby2.5
- ruby2.7 (fixed in 2.7.0-5ubuntu1.16)
- ruby3.0 (fixed in 3.0.2-7ubuntu2.10)
- ruby3.2 (fixed in 3.2.3-1ubuntu0.24.04.5)
Timeline and source
Published on 22 August 2024 and last revised on 16 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.
References
ubuntu.com (Report)
www.cve.org (Report)
github.com (Report)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
Other advisories for this package
ruby2.3 has other advisories on record. If you are patching this one, these are worth checking on the same host:
Same weakness in other software
These advisories are the same class of weakness (CWE-776: XML Entity Expansion) in other software:
