CVE catalog
CVE-2026-5246
A vulnerability was determined in Cesanta Mongoose up to 7.20. Affected is the function mg_tls_verify_cert_signature of the file mongoose.c of the component P-384 Public Key Handler. Executing a manip
- Severity
- Medium · CVSS 5.6
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.62% · Oct 25, 2026
A vulnerability was determined in Cesanta Mongoose up to 7.20. Affected is the function mg_tls_verify_cert_signature of the file mongoose.c of the component P-384 Public Key Handler. Executing a manipulation can lead to authorization bypass. The attack can be executed remotely. Attacks of this nature are highly complex. The exploitability is told to be difficult. The exploit has been publicly disclosed and may be utilized. Upgrading to version 7.21 is able to address this issue. This patch is called 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. The affected component should be upgraded. 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-2026-5246 | 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-2026-5246]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-5246]
- [https://security-tracker.debian.org/tracker/CVE-2026-5246]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5246.json]
- [https://vuldb.com/submit/770104]
- [https://vuldb.com/vuln/354827]
- [https://vuldb.com/vuln/354827/cti]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]