Process unavailability via undersized buffer reallocation
Published Sep 1, 2026 · Updated Sep 1, 2026
Incorrect buffer-size calculation in popt 1.11 and later allows local users to interrupt a process by loading crafted configuration content. poptConfigFileToString requests a reallocated buffer that is too short for attacker-controlled configuration content, corrupting heap metadata when the host loads it. Exploitation requires local low-privilege access and a host application that loads the crafted content; the affected process can become unavailable.
Summary
What happened
Incorrect buffer-size calculation in popt 1.11 and later allows local users to interrupt a process by loading crafted configuration content. poptConfigFileToString requests a reallocated buffer that is too short for attacker-controlled configuration content, corrupting heap metadata when the host loads it. Exploitation requires local low-privilege access and a host application that loads the crafted content; the affected process can become unavailable.
The record
- CVE
- CVE-2026-18743
- Published
- Sep 1, 2026
- Updated
- Sep 1, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat Enterprise Linux 6
- Classifications
- CWE-131, T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 1, 2026CVE publishedPublication date reported by the CVE source.
- Sep 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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