# CVE-2026-48863: OpenSUSE libsolv stack overflow in PGP EdDSA verification

Source: https://junglewise.ai/threats/cve-2026-48863-opensuse-libsolv-stack-overflow-in-pgp-eddsa-verification  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-16. Updated: 2026-07-16  
License: CC BY 4.0 with a link back

CVE-2026-48863 · Severity: high · CVSS 7.5 · Published 2026-07-16

libsolv, a library used for managing software packages and repositories, contains a flaw in how it verifies digital signatures. An attacker could provide a specially crafted package or repository signature that causes the software to crash when it attempts to verify the authenticity of the data. This could lead to a denial of service, disrupting automated software updates and repository management workflows.

Technologies: [Opensuse Libsolv](https://junglewise.ai/threats/technologies/libsolv), [Red Hat Enterprise Linux 10](https://junglewise.ai/threats/technologies/enterprise-linux-10). Vendors: [Opensuse](https://junglewise.ai/threats/vendors/opensuse), [Red Hat](https://junglewise.ai/threats/vendors/red-hat).

## Quick answers

**Is CVE-2026-48863 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-48863 being exploited in the wild.

**How severe is CVE-2026-48863?** High severity, with a CVSS score of 7.5, published 16 July 2026.

**Which products and versions are affected?** Opensuse Libsolv 0.6.4 to 0.7.37; Red Hat Enterprise Linux 10 libsolv-0.7.33-2.el10.

**Is there a fix for CVE-2026-48863?** A patch was published on 2026-05-26: Fixed in upstream libsolv commit 44f8c08 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-48863 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-48863?** Check whether you run Opensuse Libsolv or Red Hat Enterprise Linux 10 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow exists in `ext/solv_pgpvrfy.c` within the `solv_pgpvrfy()` function. The vulnerability is caused by using the incorrect length variable (`rlen` instead of `slen`) when copying the EdDSA 's' MPI into a fixed 64-byte stack buffer (`sigdata`). An attacker can trigger this by providing a crafted Ed25519 PGP signature where the 'r' MPI length is significantly larger than the 's' MPI length, leading to an out-of-bounds write of up to 31 bytes. This requires the library to be compiled with `ENABLE_PGPVRFY` and `ENABLE_PGPVRFY_ED25519`. The issue was fixed in upstream version 0.7.38.

## Affected products

- OpenSUSE libsolv 0.6.4 to 0.7.37
- Red Hat Red Hat Enterprise Linux 10 libsolv-0.7.33-2.el10

## Timeline

- 2026-04-23: disclosed: Reported to Red Hat Bugzilla
- 2026-05-26: patched: Fixed in upstream libsolv commit 44f8c08
- 2026-07-16: advisory: CVE published to NVD

## References

- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)
- [https://access.redhat.com/security/cve/CVE-2026-48863](https://access.redhat.com/security/cve/CVE-2026-48863)
- [https://bugzilla.redhat.com/show_bug.cgi?id=2460975](https://bugzilla.redhat.com/show_bug.cgi?id=2460975)
- [https://github.com/openSUSE/libsolv/commit/44f8c085045b1f771641091bbb2b810d12cff9e8](https://github.com/openSUSE/libsolv/commit/44f8c085045b1f771641091bbb2b810d12cff9e8)

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