Red Hat Enterprise Linux 10: Numeric Truncation Error
CVE-2026-96280 is a high-severity numeric truncation error 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, but only if a user takes part, for example by opening a link or file. There is no confirmed exploitation so far. EPSS estimates a 0.61% chance of exploitation within 30 days, which is low compared with other 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.
- Read the advisory on github.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
- Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.
Affected products and versions
Version data comes from the organisation that assigned the CVE. 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
- HighSuccess depends on conditions outside the attacker's control.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- RequiredA user must take an action such as opening a file or link.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H. Scored by CNA (redhat.com).
Official description
The OCI delta stream parser read sizes as guint64 but passed them to GLib I/O and allocation functions expecting gsize (32 bits on 32-bit systems), causing undersized allocations while subsequent operations use the original 64-bit size, leading to heap buffer overflows. An attacker controlling an OCI registry can craft a delta stream that triggers this during flatpak install/update, potentially achieving code execution on 32-bit systems.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Numeric Truncation Error
Truncation errors occur when a primitive is cast to a primitive of a smaller size and data is lost in the conversion.
How developers prevent this class of flaw
- Ensure that no casts, implicit or explicit, take place that move from a larger size primitive or a smaller size primitive.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other references
- access.redhat.com/errata/RHSA-2026:80497
- access.redhat.com/errata/RHSA-2026:80498
- access.redhat.com/errata/RHSA-2026:80687
- access.redhat.com/errata/RHSA-2026:89733
- access.redhat.com/errata/RHSA-2026:90364
- access.redhat.com/errata/RHSA-2026:92221
- access.redhat.com/errata/RHSA-2026:92369
- access.redhat.com/errata/RHSA-2026:95493
- access.redhat.com/errata/RHSA-2026:98112
- access.redhat.com/errata/RHSA-2026:98127
- access.redhat.com/errata/RHSA-2026:98490
- access.redhat.com/errata/RHSA-2026:98595
- access.redhat.com/errata/RHSA-2026:99010
- access.redhat.com/security/cve/CVE-2026-96280
- bugzilla.redhat.com/show_bug.cgi?id=2539419
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 Numeric Truncation Error vulnerabilities
- 7.5 High severity
- 9.6 Critical severity
- 7.5 High severity
- 7.5 High severity
- 7.7 High severity
- 8.8 High severity
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