CVE-2022-26496

Exp

In nbd-server in nbd before 3.24, there is a stack-based buffer overflow. An attacker can cause a buffer overflow in the parsing of the name field by sending a crafted NBD_OPT_INFO or NBD_OPT_GO message with an large value as the length of the name.

Published: 2022-03-06 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-26496 is rated High Exploit Risk (87.9/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 3.47%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +3.05% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2022-26496

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2022-26496

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.42% 3.47% +3.05%
2 2026-05-14 0.47% 0.42% -0.05%
3 2026-03-28 — 0.47% —

Full EPSS history (36 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-26496

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2022-26496

OS Trackers for CVE-2022-26496

vendor priority summary link
alpine — CVE-2022-26496: 1 source package rows (nbd); 7 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 0. https://security.alpinelinux.org/vuln/CVE-2022-26496
debian not yet assigned CVE-2022-26496 not yet assigned priority: Debian including 1 source packages (nbd), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2022-26496
gentoo normal CVE-2022-26496: 1 GLSA(s) (202402-10), 1 atom(s) (sys-block/nbd); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2022-26496
suse high — https://www.suse.com/security/cve/CVE-2022-26496/
ubuntu medium CVE-2022-26496 medium priority: Ubuntu including 1 source packages (nbd), 14 status rows across 14 suites (bionic, focal, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): released 11, needed 2, needs-triage 1. https://ubuntu.com/security/CVE-2022-26496

Affected software / configurations for CVE-2022-26496

Vendor Product Version Raw CPE
network_block_device_project network_block_device < 3.24 cpe:2.3:a:network_block_device_project:network_block_device:*:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
debian debian_linux 11.0 cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
fedoraproject fedora 34 cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
fedoraproject fedora 35 cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
fedoraproject fedora 36 cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*

References for CVE-2022-26496

URL Tags
http://packetstormsecurity.com/files/172148/Shannon-Baseband-fmtp-SDP-Attribute-Memory-Corruption.html
https://lists.debian.org/nbd/2022/01/msg00036.html Mailing List Third Party Advisory
https://lists.debian.org/nbd/2022/01/msg00037.html Exploit Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G2UPX62BIWOOHSACGUDB7E3O4URNN37F/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZHR73XMAJTCFGKUZRXVTZKCK2X3IFNA/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PU5JFD4PEJED72TZLZ5R2Q2SFXICU5I5/
https://security.gentoo.org/glsa/202402-10
https://sourceforge.net/projects/nbd/files/nbd/ Product Release Notes Third Party Advisory
https://www.debian.org/security/2022/dsa-5100 Third Party Advisory
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