HP Linux Imaging and Printing Software: Integer Overflow or Wraparound
CVE-2026-8631 is a critical-severity integer overflow or wraparound vulnerability in HP Linux Imaging and Printing Software from HP, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 3.26.4 as the first without the flaw, so updating HP Linux Imaging and Printing Software to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.81% chance of exploitation within 30 days, higher than 79% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update HP Linux Imaging and Printing Software to 3.26.4 or a later version.
- Update Linux Imaging And Printing to 3.26.4 or a later version.
- Read the advisory on support.hp.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.
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
- 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
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 9.3 | Critical | CNA (hp.com) |
| CVSS 3.1 | 9.8 | Critical | NVD |
| CVSS 3.1 | 9.8 | Critical | CNA |
Official description
A potential security vulnerability has been identified in the HP Linux Imaging and Printing Software. This potential vulnerability may allow escalation of privileges and/or arbitrary code execution via an integer overflow in the hpcups processing path when handling crafted print data.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Integer Overflow or Wraparound
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
How developers prevent this class of flaw
- Ensure that all protocols are strictly defined, such that all out-of-bounds behavior can be identified simply, and require strict conformance to the protocol.
- Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. If possible, choose a language or compiler that performs automatic bounds checking.
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. Use libraries or frameworks that make it easier to handle numbers without unexpected consequences. Examples include safe integer handling packages such as SafeInt (C++) or IntegerLib (C or C++).
More Integer Overflow or Wraparound vulnerabilities (CWE-190)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other references
- access.redhat.com/errata/RHSA-2026:26228
- access.redhat.com/errata/RHSA-2026:26297
- access.redhat.com/errata/RHSA-2026:26335
- access.redhat.com/errata/RHSA-2026:48171
- access.redhat.com/errata/RHSA-2026:48586
- access.redhat.com/errata/RHSA-2026:48603
- access.redhat.com/errata/RHSA-2026:48606
- access.redhat.com/errata/RHSA-2026:48959
- access.redhat.com/errata/RHSA-2026:48960
- access.redhat.com/errata/RHSA-2026:48961
- access.redhat.com/security/cve/CVE-2026-8631
- bugzilla.redhat.com/show_bug.cgi?id=2480300
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8631.json
Other vulnerabilities in HP Linux Imaging and Printing Software
- 7.8 High severity
- 9.1 Critical severity
Recent Integer Overflow or Wraparound vulnerabilities
- 9.8 Critical severity
- 7.5 High severity
- 9.8 Critical severity
- 7.5 High severity
- 7.5 High severity
- 8.8 High severity
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