CVE-2026-2966
published 2026-02-23CVE-2026-2966: A weakness has been identified in Cesanta Mongoose up to 7.20. The impacted element is the function mg_sendnsreq of the file /src/dns.c of the component DNS…
PriorityP419low3.7CVSS 3.1
AVNACHPRNUINSUCNILAN
EPSS
0.38%
29.8th percentile
A weakness has been identified in Cesanta Mongoose up to 7.20. The impacted element is the function mg_sendnsreq of the file /src/dns.c of the component DNS Transaction ID Handler. Executing a manipulation of the argument random can lead to insufficiently random values. The attack can be launched remotely. The attack requires a high level of complexity. The exploitability is regarded as difficult. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Affected
22 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| cesanta | mongoose | <= 7.20 | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
| cesanta | mongoose | — | — |
CVSS provenance
nvdv3.13.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
nvdv4.02.9LOWCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
nvdv2.02.6LOWAV:N/AC:H/Au:N/C:N/I:P/A:N
osv6.3MEDIUM
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OSV
CVE-2026-2966: A weakness has been identified in Cesanta Mongoose up to 7
osv·2026-02-23·CVSS 6.3
CVE-2026-2966 [MEDIUM] CVE-2026-2966: A weakness has been identified in Cesanta Mongoose up to 7
A weakness has been identified in Cesanta Mongoose up to 7.20. The impacted element is the function mg_sendnsreq of the file /src/dns.c of the component DNS Transaction ID Handler. Executing a manipulation of the argument random can lead to insufficiently random values. The attack can be launched remotely. The attack requires a high level of complexity. The exploitability is regarded as difficult. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
GHSA
GHSA-m5mm-h952-fxjj: A weakness has been identified in Cesanta Mongoose up to 7
ghsa_unreviewed·2026-02-23
CVE-2026-2966 [MEDIUM] GHSA-m5mm-h952-fxjj: A weakness has been identified in Cesanta Mongoose up to 7
A weakness has been identified in Cesanta Mongoose up to 7.20. The impacted element is the function mg_sendnsreq of the file /src/dns.c of the component DNS Transaction ID Handler. Executing a manipulation of the argument random can lead to insufficiently random values. The attack can be launched remotely. The attack requires a high level of complexity. The exploitability is regarded as difficult. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-2966 mongoose: Mongoose: Information disclosure due to insufficiently random values in DNS transaction ID handling [fedora-42]
bugzilla·2026-02-23·CVSS 2.9
CVE-2026-2966 [LOW] CVE-2026-2966 mongoose: Mongoose: Information disclosure due to insufficiently random values in DNS transaction ID handling [fedora-42]
CVE-2026-2966 mongoose: Mongoose: Information disclosure due to insufficiently random values in DNS transaction ID handling [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug reports from releases that are no longer
maintained. At that time this bug will be closed as EOL if it remains open with a
'version' of '42'.
Package Maintainer: If you wish for this bug to remain open because you
plan to fix
Bugzilla
CVE-2026-2966 smplayer: Mongoose: Information disclosure due to insufficiently random values in DNS transaction ID handling [fedora-42]
bugzilla·2026-02-23·CVSS 2.9
CVE-2026-2966 [LOW] CVE-2026-2966 smplayer: Mongoose: Information disclosure due to insufficiently random values in DNS transaction ID handling [fedora-42]
CVE-2026-2966 smplayer: Mongoose: Information disclosure due to insufficiently random values in DNS transaction ID handling [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug reports from releases that are no longer
maintained. At that time this bug will be closed as EOL if it remains open with a
'version' of '42'.
Package Maintainer: If you wish for this bug to remain open because you
plan to fix
Bugzilla
CVE-2026-2966 flmsg: Mongoose: Information disclosure due to insufficiently random values in DNS transaction ID handling [fedora-42]
bugzilla·2026-02-23·CVSS 2.9
CVE-2026-2966 [LOW] CVE-2026-2966 flmsg: Mongoose: Information disclosure due to insufficiently random values in DNS transaction ID handling [fedora-42]
CVE-2026-2966 flmsg: Mongoose: Information disclosure due to insufficiently random values in DNS transaction ID handling [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug reports from releases that are no longer
maintained. At that time this bug will be closed as EOL if it remains open with a
'version' of '42'.
Package Maintainer: If you wish for this bug to remain open because you
plan to fix it
Wiz
CVE-2026-2966 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 6.3
CVE-2026-2966 [MEDIUM] CVE-2026-2966 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-2966 :
NixOS vulnerability analysis and mitigation
A weakness has been identified in Cesanta Mongoose up to 7.20. The impacted element is the function mg_sendnsreq of the file /src/dns.c of the component DNS Transaction ID Handler. Executing a manipulation of the argument random can lead to insufficiently random values. The attack can be launched remotely. The attack requires a high level of complexity. The exploitability is regarded as difficult. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Source : NVD
## 6.3
Score
Published February 23, 2026
Severity MEDIUM
CNA Score 6.3
Affected Technologies
NixOS
Homebrew
Has Public Exploit Yes
Has CISA KE
2026-02-23
Published