CVE catalog
CVE-2026-20777
A heap-based buffer overflow vulnerability exists in the Nicolet WFT parsing functionality of The Biosig Project libbiosig 3.9.2 and Master Branch (db9a9a63). A specially crafted .wft file can lead to
- Severity
- Critical · CVSS 9.8
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.53% · Oct 25, 2026
A heap-based buffer overflow vulnerability exists in the Nicolet WFT parsing functionality of The Biosig Project libbiosig 3.9.2 and Master Branch (db9a9a63). A specially crafted .wft file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.
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 | biosig | sid | 3.9.5-1 | fixed |
| Debian | biosig | forky | 3.9.5-1 | fixed |
| Debian | biosig | trixie | 3.9.0-1 | vulnerable |
| Debian | biosig | bookworm | 2.5.0-1 | vulnerable |
| Cpe | biosig | Not reported | Not reported | vulnerable |
| Ubuntu | biosig | noble | 2.6.0-1ubuntu1+esm1 | fixed |
| Ubuntu | biosig-tools | noble | 2.6.0-1ubuntu1+esm1 | fixed |
| Ubuntu | libbiosig-dev | noble | 2.6.0-1ubuntu1+esm1 | fixed |
| Ubuntu | libbiosig3 | noble | 2.6.0-1ubuntu1+esm1 | fixed |
| Ubuntu | octave-biosig | noble | 2.6.0-1ubuntu1+esm1 | fixed |
| Ubuntu | python3-biosig | noble | 2.6.0-1ubuntu1+esm1 | fixed |
| Ubuntu | biosig | pro | 3.9.0-1 | vulnerable |
| Ubuntu | biosig | pro | 3.9.0-1build1 | vulnerable |
| Ubuntu | biosig | pro | 3.9.0-1build2 | vulnerable |
| Ubuntu | biosig | pro | 3.9.0-1build3 | vulnerable |
| Ubuntu | biosig | pro | 3.9.0-1ubuntu0.1~esm1 | fixed |
| Ubuntu | biosig | pro | 3.9.0-1 | vulnerable |
| Ubuntu | biosig | pro | 3.9.0-1build1 | vulnerable |
| Ubuntu | biosig | pro | 3.9.0-1build2 | vulnerable |
| Ubuntu | biosig | pro | 3.9.0-1build3 | vulnerable |
| Ubuntu | biosig | pro | 3.9.0-1ubuntu0.1~esm1 | fixed |
| Ubuntu | biosig | 25.10 | 2.6.1-1build3 | vulnerable |
| Ubuntu | biosig | 25.10 | 3.9.0-1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | biosig | source | sid | 3.9.5-1 | not yet assigned | Not reported | [1130889] |
| Debian | biosig | source | forky | 3.9.5-1 | not yet assigned | Not reported | [1130889] |
| Debian | biosig | source | trixie | (unfixed) | not yet assigned | Not reported | [1130889] |
| Debian | biosig | source | bookworm | (unfixed) | not yet assigned | Not reported | [1130889] |
| Ubuntu | biosig | deb | noble | 2.6.0-1ubuntu1+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | biosig-tools | deb | noble | 2.6.0-1ubuntu1+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | libbiosig-dev | deb | noble | 2.6.0-1ubuntu1+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | libbiosig3 | deb | noble | 2.6.0-1ubuntu1+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | octave-biosig | deb | noble | 2.6.0-1ubuntu1+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | python3-biosig | deb | noble | 2.6.0-1ubuntu1+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | biosig | deb | pro | 3.9.0-1ubuntu0.1~esm1 | Not reported | USN-8713-1 | Not reported |
| Ubuntu | biosig | deb | pro | 3.9.0-1ubuntu0.1~esm1 | Not reported | UBUNTU-CVE-2026-20777 | Not reported |
Notes
[trixie] biosig: Minor issue [bookworm] biosig: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [biosig-tools]Affected
Source package: [biosig]
Details (2)
2.5.0-1+b1· amd64 · bookwormAffected
nvd · biosig · debian · bookworm; nvd · biosig · debian · 12
2.5.0-1+b1· arm64 · bookwormAffected
nvd · biosig · debian · bookworm; nvd · biosig · debian · 12
- [libbiosig3]Affected
Source package: [biosig]
Details (2)
2.5.0-1+b1· amd64 · bookwormAffected
nvd · biosig · debian · bookworm; nvd · biosig · debian · 12
2.5.0-1+b1· arm64 · bookwormAffected
nvd · biosig · debian · bookworm; nvd · biosig · debian · 12
- [libbiosig-dev]Affected
Source package: [biosig]
Details (2)
2.5.0-1+b1· amd64 · bookwormAffected
nvd · biosig · debian · bookworm; nvd · biosig · debian · 12
2.5.0-1+b1· arm64 · bookwormAffected
nvd · biosig · debian · bookworm; nvd · biosig · debian · 12
- [octave-biosig]Affected
Source package: [biosig]
Details (2)
2.5.0-1+b1· amd64 · bookwormAffected
nvd · biosig · debian · bookworm; nvd · biosig · debian · 12
2.5.0-1+b1· arm64 · bookwormAffected
nvd · biosig · debian · bookworm; nvd · biosig · debian · 12
- [python3-biosig]Affected
Source package: [biosig]
Details (2)
2.5.0-1+b1· amd64 · bookwormAffected
nvd · biosig · debian · bookworm; nvd · biosig · debian · 12
2.5.0-1+b1· arm64 · bookwormAffected
nvd · biosig · debian · bookworm; nvd · biosig · debian · 12
[Debian 13 (Trixie)]
- [biosig-tools]Affected
Source package: [biosig]
Details (2)
3.9.0-1· amd64 · trixieAffected
nvd · biosig · debian · 13
3.9.0-1· arm64 · trixieAffected
nvd · biosig · debian · 13
- [libbiosig3]Affected
Source package: [biosig]
Details (2)
3.9.0-1· amd64 · trixieAffected
nvd · biosig · debian · 13
3.9.0-1· arm64 · trixieAffected
nvd · biosig · debian · 13
- [libbiosig-dev]Affected
Source package: [biosig]
Details (2)
3.9.0-1· amd64 · trixieAffected
nvd · biosig · debian · 13
3.9.0-1· arm64 · trixieAffected
nvd · biosig · debian · 13
- [octave-biosig]Affected
Source package: [biosig]
Details (2)
3.9.0-1· amd64 · trixieAffected
nvd · biosig · debian · 13
3.9.0-1· arm64 · trixieAffected
nvd · biosig · debian · 13
- [python3-biosig]Affected
Source package: [biosig]
Details (2)
3.9.0-1· amd64 · trixieAffected
nvd · biosig · debian · 13
3.9.0-1· arm64 · trixieAffected
nvd · biosig · debian · 13
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-20777]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-20777]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-20777]
- [https://osv.dev/vulnerability/USN-8713-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-20777]
- [https://ubuntu.com/security/notices/USN-8713-1]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Ubuntu Security Notices (USN)]