CVE catalog
CVE-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 Handler. Performing a manipulation of the arg
- Severity
- High · CVSS 8.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.72% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | swupdate | sid | 2026.05.1+git20261001+dfsg-2 | fixed |
| Debian | swupdate | forky | 2026.05.1+git20261001+dfsg-2 | fixed |
| Debian | swupdate | trixie | 2024.12.1+dfsg-3+deb13u2 | vulnerable |
| Debian | swupdate | bookworm | 2022.12+dfsg-4+deb12u2 | vulnerable |
| Debian | swupdate | bookworm-security | 2022.12+dfsg-4+deb12u3 | vulnerable |
| Cpe | swupdate | Not reported | Not reported | vulnerable |
| Cpe | mongoose | Not reported | 7.21 | fixed |
| Cpe | mongoose | Not reported | 7.21 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | swupdate | source | sid | 2025.12+dfsg-10 | not yet assigned | Not reported | Not reported |
| Debian | swupdate | source | forky | 2025.12+dfsg-10 | not yet assigned | Not reported | Not reported |
| Debian | swupdate | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | swupdate | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Cpe | mongoose | cpe | Not reported | 7.21 | Not reported | Not reported | Not reported |
| Cpe | mongoose | cpe | Not reported | 7.21 | Not reported | NVD-CVE-2026-5245 | Not reported |
Notes
[trixie] swupdate: Minor issue [bookworm] swupdate: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libswupdate0.1]Affected
Source package: [swupdate]
Details (4)
2022.12+dfsg-4+deb12u2· amd64 · bookwormAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2022.12+dfsg-4+deb12u2· arm64 · bookwormAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2024.12.1+dfsg-3~bpo12+1· amd64 · bookworm-backportsAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2024.12.1+dfsg-3~bpo12+1· arm64 · bookworm-backportsAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
- [libswupdate-dev]Affected
Source package: [swupdate]
Details (4)
2022.12+dfsg-4+deb12u2· amd64 · bookwormAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2022.12+dfsg-4+deb12u2· arm64 · bookwormAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2024.12.1+dfsg-3~bpo12+1· amd64 · bookworm-backportsAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2024.12.1+dfsg-3~bpo12+1· arm64 · bookworm-backportsAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
- [lua-swupdate]Affected
Source package: [swupdate]
Details (4)
2022.12+dfsg-4+deb12u2· amd64 · bookwormAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2022.12+dfsg-4+deb12u2· arm64 · bookwormAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2024.12.1+dfsg-3~bpo12+1· amd64 · bookworm-backportsAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2024.12.1+dfsg-3~bpo12+1· arm64 · bookworm-backportsAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
- [swupdate]Affected
Details (4)
2022.12+dfsg-4+deb12u2· amd64 · bookwormAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2022.12+dfsg-4+deb12u2· arm64 · bookwormAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2024.12.1+dfsg-3~bpo12+1· amd64 · bookworm-backportsAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2024.12.1+dfsg-3~bpo12+1· arm64 · bookworm-backportsAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
- [swupdate-doc]Affected
Source package: [swupdate]
Details (4)
2022.12+dfsg-4+deb12u2· all · bookwormAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2022.12+dfsg-4+deb12u2· all · bookwormAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2024.12.1+dfsg-3~bpo12+1· all · bookworm-backportsAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2024.12.1+dfsg-3~bpo12+1· all · bookworm-backportsAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
- [swupdate-www]Affected
Source package: [swupdate]
Details (4)
2022.12+dfsg-4+deb12u2· all · bookwormAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2022.12+dfsg-4+deb12u2· all · bookwormAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2024.12.1+dfsg-3~bpo12+1· all · bookworm-backportsAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
2024.12.1+dfsg-3~bpo12+1· all · bookworm-backportsAffected
nvd · swupdate · debian · bookworm; nvd · swupdate · debian · 12
[Debian 13 (Trixie)]
- [libswupdate0.1]Affected
Source package: [swupdate]
Details (4)
2024.12.1+dfsg-3+deb13u2· amd64 · trixieAffected
nvd · swupdate · debian · 13
2024.12.1+dfsg-3+deb13u2· arm64 · trixieAffected
nvd · swupdate · debian · 13
2026.05.1+dfsg-1~bpo13+1· amd64 · trixie-backportsAffected
nvd · swupdate · debian · 13
2026.05.1+dfsg-1~bpo13+1· arm64 · trixie-backportsAffected
nvd · swupdate · debian · 13
- [libswupdate-dev]Affected
Source package: [swupdate]
Details (4)
2024.12.1+dfsg-3+deb13u2· amd64 · trixieAffected
nvd · swupdate · debian · 13
2024.12.1+dfsg-3+deb13u2· arm64 · trixieAffected
nvd · swupdate · debian · 13
2026.05.1+dfsg-1~bpo13+1· amd64 · trixie-backportsAffected
nvd · swupdate · debian · 13
2026.05.1+dfsg-1~bpo13+1· arm64 · trixie-backportsAffected
nvd · swupdate · debian · 13
- [lua-swupdate]Affected
Source package: [swupdate]
Details (4)
2024.12.1+dfsg-3+deb13u2· amd64 · trixieAffected
nvd · swupdate · debian · 13
2024.12.1+dfsg-3+deb13u2· arm64 · trixieAffected
nvd · swupdate · debian · 13
2026.05.1+dfsg-1~bpo13+1· amd64 · trixie-backportsAffected
nvd · swupdate · debian · 13
2026.05.1+dfsg-1~bpo13+1· arm64 · trixie-backportsAffected
nvd · swupdate · debian · 13
- [swupdate]Affected
Details (4)
2024.12.1+dfsg-3+deb13u2· amd64 · trixieAffected
nvd · swupdate · debian · 13
2024.12.1+dfsg-3+deb13u2· arm64 · trixieAffected
nvd · swupdate · debian · 13
2026.05.1+dfsg-1~bpo13+1· amd64 · trixie-backportsAffected
nvd · swupdate · debian · 13
2026.05.1+dfsg-1~bpo13+1· arm64 · trixie-backportsAffected
nvd · swupdate · debian · 13
- [swupdate-doc]Affected
Source package: [swupdate]
Details (4)
2024.12.1+dfsg-3+deb13u2· all · trixieAffected
nvd · swupdate · debian · 13
2024.12.1+dfsg-3+deb13u2· all · trixieAffected
nvd · swupdate · debian · 13
2026.05.1+dfsg-1~bpo13+1· all · trixie-backportsAffected
nvd · swupdate · debian · 13
2026.05.1+dfsg-1~bpo13+1· all · trixie-backportsAffected
nvd · swupdate · debian · 13
- [swupdate-www]Affected
Source package: [swupdate]
Details (4)
2024.12.1+dfsg-3+deb13u2· all · trixieAffected
nvd · swupdate · debian · 13
2024.12.1+dfsg-3+deb13u2· all · trixieAffected
nvd · swupdate · debian · 13
2026.05.1+dfsg-1~bpo13+1· all · trixie-backportsAffected
nvd · swupdate · debian · 13
2026.05.1+dfsg-1~bpo13+1· all · trixie-backportsAffected
nvd · swupdate · debian · 13
Observed:
References
- [https://github.com/cesanta/mongoose/]
- [https://github.com/cesanta/mongoose/commit/0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1]
- [https://github.com/cesanta/mongoose/releases/tag/7.21]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-5245]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-5245]
- [https://security-tracker.debian.org/tracker/CVE-2026-5245]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5245.json]
- [https://vuldb.com/submit/770103]
- [https://vuldb.com/vuln/354826]
- [https://vuldb.com/vuln/354826/cti]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]