CVE-2025-47711Nbdkit: nbdkit-server: off-by-one error when processing block status may lead to a denial of service
- 6.5MediumCVSS base score
- 0.48%Exploitation in 30 daysEPSS · top 58% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
There's a flaw in the nbdkit server when handling responses from its plugins regarding the status of data blocks. If a client makes a specific request for a very large data range, and a plugin responds with an even larger single block, the nbdkit server can encounter a critical internal error, leading to a denial-of-service.
Timeline
ID reserved
By redhat
- 33 days later
· 33 days later
Published
- 17 months later
· 17 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.1 | Medium6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.48% · top 58% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.
Affected products
nbdkit
- affected 1.11.10 – < 1.38.6
- affected 1.40.0 – < 1.40.6
- affected 1.42.0 – < 1.42.3
Red Hat · Red Hat Enterprise Linux 10
All versions: affected
Red Hat · Red Hat Enterprise Linux 7
All versions: unknown
Red Hat · Red Hat Enterprise Linux 8
All versions: unknown
Red Hat · Red Hat Enterprise Linux 8 Advanced Virtualization
All versions: unknown
Red Hat · Red Hat Enterprise Linux 8 Advanced Virtualization
All versions: unknown
Red Hat · Red Hat Enterprise Linux 9
All versions: affected
References
References3
- https://access.redhat.com/security/cve/CVE-2025-47711 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2365687 (opens in a new tab)issue-trackingx_refsource_REDHAT
- https://lists.libguestfs.org/archives/list/[email protected]/thread/67E7AASHHADIY7VAD3FFW2I67LTWVWYF/ (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-17431 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-47711)Record last updated .