CVE catalog
CVE-2026-5244
A vulnerability has been found in Cesanta Mongoose up to 7.20. This affects the function mg_tls_recv_cert of the file mongoose.c of the component TLS 1.3 Handler. Such manipulation of the argument pub
- Severity
- High · CVSS 8.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.73% · Oct 25, 2026
A vulnerability has been found in Cesanta Mongoose up to 7.20. This affects the function mg_tls_recv_cert of the file mongoose.c of the component TLS 1.3 Handler. Such manipulation of the argument pubkey leads to heap-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 7.21 mitigates this issue. The name of the patch is 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. It is advisable to 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-2026-5244 | 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-2026-5244]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-5244]
- [https://security-tracker.debian.org/tracker/CVE-2026-5244]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5244.json]
- [https://vuldb.com/submit/770063]
- [https://vuldb.com/vuln/354825]
- [https://vuldb.com/vuln/354825/cti]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]