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Vulnerability record · CVE-2026-48863 · published 16 July 2026

CVE-2026-48863: Stack-based buffer overflow vulnerability

A flaw was found in libsolv. A stack-based buffer overflow vulnerability exists in the PGP verification component due to incorrect length handling when copying EdDSA 's' MPI into a stack buffer. A remote attacker could craft a malicious Ed25519 PGP signature with mismatched MPI lengths. Processing this crafted signature could lead to a denial of service in automated package or repository processing workflows.

7.5 CVSS 3.1 High EPSS 0.82% · top 44.4% CWE-121 · Stack-based buffer overflow Awaiting Analysis
7.5CVSS 3.1 base score
0.82%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
31 Aug 2026Last modified by NVD

Description

A flaw was found in libsolv. A stack-based buffer overflow vulnerability exists in the PGP verification component due to incorrect length handling when copying EdDSA 's' MPI into a stack buffer. A remote attacker could craft a malicious Ed25519 PGP signature with mismatched MPI lengths. Processing this crafted signature could lead to a denial of service in automated package or repository processing workflows.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

LinkTags
https://access.redhat.com/security/cve/CVE-2026-48863
https://bugzilla.redhat.com/show_bug.cgi?id=2460975
https://github.com/openSUSE/libsolv/commit/44f8c085045b1f771641091bbb2b810d12cff9e8#diff-309f245ec9b669ec78b8159c39e6f50
https://access.redhat.com/security/cve/CVE-2026-48863
https://bugzilla.redhat.com/show_bug.cgi?id=2460975
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48863.json

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Source: NIST National Vulnerability Database (record CVE-2026-48863), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.