Red Hat Enterprise Linux 10: Out-of-bounds Read
CVE-2026-4424 is a high-severity out-of-bounds read vulnerability in Red Hat Enterprise Linux 10 from Red Hat, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 1.24% chance of exploitation within 30 days, higher than 70% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Red Hat Enterprise Linux 10 you run against the affected versions below, and install the vendor's latest release.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
Version data comes from the organisation that assigned the CVE; 18 further products are omitted here. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. Scored by CNA (redhat.com).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | CNA (redhat.com) |
| CVSS 3.1 | 7.5 | High | CNA |
Official description
A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processing logic due to improper validation of the LZSS sliding window size after transitions between compression methods. A remote attacker can exploit this by providing a specially crafted RAR archive, leading to the disclosure of sensitive heap memory information without requiring authentication or user interaction.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- github.com/libarchive/libarchive/pull/2898Issue Tracking, Third Party Advisory
Third-party and government advisories
- access.redhat.com/errata/RHSA-2026:10065Third Party Advisory
- access.redhat.com/errata/RHSA-2026:10097Third Party Advisory
- access.redhat.com/errata/RHSA-2026:11768Third Party Advisory
- access.redhat.com/errata/RHSA-2026:8492Third Party Advisory
- access.redhat.com/errata/RHSA-2026:8510Third Party Advisory
- access.redhat.com/errata/RHSA-2026:8517Third Party Advisory
- access.redhat.com/errata/RHSA-2026:8521Third Party Advisory
- access.redhat.com/errata/RHSA-2026:8534Third Party Advisory
- access.redhat.com/errata/RHSA-2026:8864Third Party Advisory
- access.redhat.com/errata/RHSA-2026:8865Third Party Advisory
- access.redhat.com/errata/RHSA-2026:8866Third Party Advisory
- access.redhat.com/errata/RHSA-2026:8867Third Party Advisory
- access.redhat.com/errata/RHSA-2026:8873Third Party Advisory
- access.redhat.com/errata/RHSA-2026:8908Third Party Advisory
- access.redhat.com/errata/RHSA-2026:8944Third Party Advisory
Other references
- access.redhat.com/errata/RHSA-2026:12071
- access.redhat.com/errata/RHSA-2026:12274
- access.redhat.com/errata/RHSA-2026:13812
- access.redhat.com/errata/RHSA-2026:14773
- access.redhat.com/errata/RHSA-2026:14937
- access.redhat.com/errata/RHSA-2026:15087
- access.redhat.com/errata/RHSA-2026:16008
- access.redhat.com/errata/RHSA-2026:16009
- access.redhat.com/errata/RHSA-2026:16030
- access.redhat.com/errata/RHSA-2026:16174
- access.redhat.com/errata/RHSA-2026:17596
- access.redhat.com/errata/RHSA-2026:19724
- access.redhat.com/errata/RHSA-2026:19725
- access.redhat.com/errata/RHSA-2026:20040
- access.redhat.com/errata/RHSA-2026:21690
Other vulnerabilities in Red Hat Enterprise Linux 10
- 8.8 High severity
- 7.5 High severity
- 7.5 High severity
- 7.9 High severity
- 7.3 High severity
- 7.5 High severity
Recent Out-of-bounds Read vulnerabilities
- 7.5 High severity
- 9.1 Critical severity
- 9.1 Critical severity
- 8.2 High severity
- 7.1 High severity
- 7.1 High severity
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