CVE-2026-5245
published 2026-04-02CVE-2026-5245: A vulnerability was found in Cesanta Mongoose up to 7.20. This impacts the function handle_mdns_record of the file mongoose.c of the component mDNS Record…
PriorityP356high8.1CVSS 3.1
AVNACHPRNUINSUCHIHAH
EPSS
0.72%
52.3th percentile
A vulnerability was found in Cesanta Mongoose up to 7.20. This impacts the function handle_mdns_record of the file mongoose.c of the component mDNS Record Handler. Performing a manipulation of the argument buf results in stack-based buffer overflow. Remote exploitation of the attack is possible. A high degree of complexity is needed for the attack. The exploitability is said to be difficult. The exploit has been made public and could be used. Upgrading to version 7.21 will fix this issue. The patch is named 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. You should upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Affected
22 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| 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 | — | — |
| cesanta | mongoose | >= 7.0 < 7.21 | 7.21 |
CVSS provenance
nvdv3.18.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv4.02.9LOWCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/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
nvdv2.05.1MEDIUMAV:N/AC:H/Au:N/C:P/I:P/A:P
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Bugzilla
CVE-2026-5245 mongoose: stack-based buffer overflow in mDNS
bugzilla·2026-04-02·CVSS 8.1
CVE-2026-5245 [HIGH] CVE-2026-5245 mongoose: stack-based buffer overflow in mDNS
CVE-2026-5245 mongoose: stack-based buffer overflow in mDNS
A vulnerability was found in Cesanta Mongoose up to 7.20. This impacts the function handle_mdns_record of the file mongoose.c of the component mDNS Record Handler. Performing a manipulation of the argument buf results in stack-based buffer overflow. Remote exploitation of the attack is possible. A high degree of complexity is needed for the attack. The exploitability is said to be difficult. The exploit has been made public and could be used. Upgrading to version 7.21 will fix this issue. The patch is named 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. You should upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Bugzilla
CVE-2026-5245 mongoose: stack-based buffer overflow in mDNS [fedora-all]
bugzilla·2026-04-02·CVSS 2.9
CVE-2026-5245 [LOW] CVE-2026-5245 mongoose: stack-based buffer overflow in mDNS [fedora-all]
CVE-2026-5245 mongoose: stack-based buffer overflow in mDNS [fedora-all]
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 package has changed maintainer in Fedora. Reassigning to the new maintainer of this component.
Bugzilla
CVE-2026-5245 flmsg: stack-based buffer overflow in mDNS [fedora-all]
bugzilla·2026-04-02·CVSS 8.1
CVE-2026-5245 [HIGH] CVE-2026-5245 flmsg: stack-based buffer overflow in mDNS [fedora-all]
CVE-2026-5245 flmsg: stack-based buffer overflow in mDNS [fedora-all]
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 bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.
Bugzilla
CVE-2026-5245 smplayer: stack-based buffer overflow in mDNS [fedora-all]
bugzilla·2026-04-02·CVSS 8.1
CVE-2026-5245 [HIGH] CVE-2026-5245 smplayer: stack-based buffer overflow in mDNS [fedora-all]
CVE-2026-5245 smplayer: stack-based buffer overflow in mDNS [fedora-all]
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 bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.
2026-04-02
Published