Catalogo CVE
CVE-2026-44950
libxfont: CVE-2026-44950
- Gravità
- Critical · CVSS 9.5
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/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 - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.26% · Oct 22, 2026
fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation. A malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content.
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 | libxfont | sid | 1:2.0.9-1 | fixed |
| Debian | libxfont | forky | 1:2.0.9-1 | fixed |
| Debian | libxfont | trixie | 1:2.0.6-1+deb13u1 | vulnerable |
| Debian | libxfont | trixie-security | 1:2.0.6-1+deb13u1 | vulnerable |
| Debian | libxfont | bookworm | 1:2.0.6-1 | vulnerable |
| Debian | libxfont | bookworm-security | 1:2.0.6-1+deb12u1 | vulnerable |
| Ubuntu | libxfont2 | 16.04 | 1:2.0.1-3~ubuntu16.04.1 | vulnerable |
| Ubuntu | libxfont2 | 16.04 | 1:2.0.1-3~ubuntu16.04.2 | vulnerable |
| Ubuntu | libxfont2 | 16.04 | 1:2.0.1-3~ubuntu16.04.3 | vulnerable |
| Suse | libXfont2 | linux enterprise server 16.0 | 2.0.7-160000.5.1 | fixed |
| Suse | libXfont2 | linux enterprise server for sap applications 16.0 | 2.0.7-160000.5.1 | fixed |
| Suse | libXfont2 | linux enterprise server 16.0 | 2.0.7-160000.5.1 | fixed |
| Suse | libXfont2 | linux enterprise server for sap applications 16.0 | 2.0.7-160000.5.1 | fixed |
| Opensuse | libXfont2 | leap 16.0 | 2.0.7-160000.5.1 | fixed |
| Opensuse | libXfont2 | tumbleweed | 2.0.7-3.1 | fixed |
| Suse | libXfont2 | linux enterprise server 12 sp5-ltss | 2.0.3-3.6.1 | fixed |
| Suse | libXfont2 | linux enterprise server ltss extended security 12 sp5 | 2.0.3-3.6.1 | fixed |
| Suse | libXfont2 | linux enterprise module for basesystem 15 sp7 | 2.0.3-150000.3.6.1 | fixed |
| Suse | libXfont2 | linux enterprise high performance computing 15 sp4-espos | 2.0.3-150000.3.6.1 | fixed |
| Suse | libXfont2 | linux enterprise high performance computing 15 sp4-ltss | 2.0.3-150000.3.6.1 | fixed |
| Suse | libXfont2 | linux enterprise high performance computing 15 sp5-espos | 2.0.3-150000.3.6.1 | fixed |
| Suse | libXfont2 | linux enterprise high performance computing 15 sp5-ltss | 2.0.3-150000.3.6.1 | fixed |
| Suse | libXfont2 | linux enterprise server 15 sp4-ltss | 2.0.3-150000.3.6.1 | fixed |
| Suse | libXfont2 | linux enterprise server 15 sp5-ltss | 2.0.3-150000.3.6.1 | fixed |
| Suse | libXfont2 | linux enterprise server 15 sp6-ltss | 2.0.3-150000.3.6.1 | fixed |
| Suse | libXfont2 | linux enterprise server for sap applications 15 sp4 | 2.0.3-150000.3.6.1 | fixed |
| Suse | libXfont2 | linux enterprise server for sap applications 15 sp5 | 2.0.3-150000.3.6.1 | fixed |
| Suse | libXfont2 | linux enterprise server for sap applications 15 sp6 | 2.0.3-150000.3.6.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libxfont | source | sid | 1:2.0.9-1 | unimportant | Not reported | Not reported |
| Debian | libxfont | source | forky | 1:2.0.9-1 | unimportant | Not reported | Not reported |
| Debian | libxfont | source | trixie | (unfixed) | unimportant | Not reported | Not reported |
| Debian | libxfont | source | bookworm | (unfixed) | unimportant | Not reported | Not reported |
| Suse | libXfont2 | rpm | linux enterprise server 16.0 | 2.0.7-160000.5.1 | Not reported | SUSE-SU-2026:23151-1 | Not reported |
| Suse | libXfont2 | rpm | linux enterprise server for sap applications 16.0 | 2.0.7-160000.5.1 | Not reported | SUSE-SU-2026:23151-1 | Not reported |
| Suse | libXfont2 | rpm | linux enterprise server 16.0 | 2.0.7-160000.5.1 | Not reported | SUSE-SU-2026:23128-1 | Not reported |
| Suse | libXfont2 | rpm | linux enterprise server for sap applications 16.0 | 2.0.7-160000.5.1 | Not reported | SUSE-SU-2026:23128-1 | Not reported |
| Opensuse | libXfont2 | rpm | leap 16.0 | 2.0.7-160000.5.1 | Not reported | OPENSUSE-SU-2026:21539-1 | Not reported |
| Opensuse | libXfont2 | rpm | tumbleweed | 2.0.7-3.1 | Not reported | OPENSUSE-SU-2026:11463-1 | Not reported |
| Suse | libXfont2 | rpm | linux enterprise server 12 sp5-ltss | 2.0.3-3.6.1 | Not reported | SUSE-SU-2026:3499-1 | Not reported |
| Suse | libXfont2 | rpm | linux enterprise server ltss extended security 12 sp5 | 2.0.3-3.6.1 | Not reported | SUSE-SU-2026:3499-1 | Not reported |
| Suse | libXfont2 | rpm | linux enterprise module for basesystem 15 sp7 | 2.0.3-150000.3.6.1 | Not reported | SUSE-SU-2026:3500-1 | Not reported |
| Suse | libXfont2 | rpm | linux enterprise high performance computing 15 sp4-espos | 2.0.3-150000.3.6.1 | Not reported | SUSE-SU-2026:3500-1 | Not reported |
| Suse | libXfont2 | rpm | linux enterprise high performance computing 15 sp4-ltss | 2.0.3-150000.3.6.1 | Not reported | SUSE-SU-2026:3500-1 | Not reported |
| Suse | libXfont2 | rpm | linux enterprise high performance computing 15 sp5-espos | 2.0.3-150000.3.6.1 | Not reported | SUSE-SU-2026:3500-1 | Not reported |
| Suse | libXfont2 | rpm | linux enterprise high performance computing 15 sp5-ltss | 2.0.3-150000.3.6.1 | Not reported | SUSE-SU-2026:3500-1 | Not reported |
| Suse | libXfont2 | rpm | linux enterprise server 15 sp4-ltss | 2.0.3-150000.3.6.1 | Not reported | SUSE-SU-2026:3500-1 | Not reported |
| Suse | libXfont2 | rpm | linux enterprise server 15 sp5-ltss | 2.0.3-150000.3.6.1 | Not reported | SUSE-SU-2026:3500-1 | Not reported |
| Suse | libXfont2 | rpm | linux enterprise server 15 sp6-ltss | 2.0.3-150000.3.6.1 | Not reported | SUSE-SU-2026:3500-1 | Not reported |
| Suse | libXfont2 | rpm | linux enterprise server for sap applications 15 sp4 | 2.0.3-150000.3.6.1 | Not reported | SUSE-SU-2026:3500-1 | Not reported |
| Suse | libXfont2 | rpm | linux enterprise server for sap applications 15 sp5 | 2.0.3-150000.3.6.1 | Not reported | SUSE-SU-2026:3500-1 | Not reported |
| Suse | libXfont2 | rpm | linux enterprise server for sap applications 15 sp6 | 2.0.3-150000.3.6.1 | Not reported | SUSE-SU-2026:3500-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libxfont2]Interessata
Pacchetto sorgente: [libxfont]
Dettagli (4)
1:2.0.6-1· amd64 · bookwormInteressata
dsa · libxfont · debian · bookworm; dsa · libxfont · debian · 12
1:2.0.6-1· arm64 · bookwormInteressata
dsa · libxfont · debian · bookworm; dsa · libxfont · debian · 12
1:2.0.6-1+deb12u1· amd64 · bookworm-securityInteressata
dsa · libxfont · debian · bookworm; dsa · libxfont · debian · 12
1:2.0.6-1+deb12u1· arm64 · bookworm-securityInteressata
dsa · libxfont · debian · bookworm; dsa · libxfont · debian · 12
- [libxfont-dev]Interessata
Pacchetto sorgente: [libxfont]
Dettagli (4)
1:2.0.6-1· amd64 · bookwormInteressata
dsa · libxfont · debian · bookworm; dsa · libxfont · debian · 12
1:2.0.6-1· arm64 · bookwormInteressata
dsa · libxfont · debian · bookworm; dsa · libxfont · debian · 12
1:2.0.6-1+deb12u1· amd64 · bookworm-securityInteressata
dsa · libxfont · debian · bookworm; dsa · libxfont · debian · 12
1:2.0.6-1+deb12u1· arm64 · bookworm-securityInteressata
dsa · libxfont · debian · bookworm; dsa · libxfont · debian · 12
[Debian 13 (Trixie)]
- [libxfont2]Interessata
Pacchetto sorgente: [libxfont]
Dettagli (4)
1:2.0.6-1+b3· amd64 · trixieInteressata
dsa · libxfont · debian · 13
1:2.0.6-1+b3· arm64 · trixieInteressata
dsa · libxfont · debian · 13
1:2.0.6-1+deb13u1· amd64 · trixie-securityInteressata
dsa · libxfont · debian · 13
1:2.0.6-1+deb13u1· arm64 · trixie-securityInteressata
dsa · libxfont · debian · 13
- [libxfont-dev]Interessata
Pacchetto sorgente: [libxfont]
Dettagli (4)
1:2.0.6-1+b3· amd64 · trixieInteressata
dsa · libxfont · debian · 13
1:2.0.6-1+b3· arm64 · trixieInteressata
dsa · libxfont · debian · 13
1:2.0.6-1+deb13u1· amd64 · trixie-securityInteressata
dsa · libxfont · debian · 13
1:2.0.6-1+deb13u1· arm64 · trixie-securityInteressata
dsa · libxfont · debian · 13
[openSUSE Tumbleweed]
- [libXfont2-2]Sconosciuto
Pacchetto sorgente: [libXfont2]
Dettagli (1)
2.0.7-3.1· x86_64 · tumbleweedSconosciuto · Corretta:
2.0.7-3.1Version impact unknown
dsa · libXfont2 · opensuse · tumbleweed
- [libXfont2-2-32bit]Sconosciuto
Pacchetto sorgente: [libXfont2]
Dettagli (1)
2.0.7-3.1· x86_64 · tumbleweedSconosciuto · Corretta:
2.0.7-3.1Version impact unknown
dsa · libXfont2 · opensuse · tumbleweed
- [libXfont2-devel]Sconosciuto
Pacchetto sorgente: [libXfont2]
Dettagli (1)
2.0.7-3.1· x86_64 · tumbleweedSconosciuto · Corretta:
2.0.7-3.1Version impact unknown
dsa · libXfont2 · opensuse · tumbleweed
- [libXfont2-devel-32bit]Sconosciuto
Pacchetto sorgente: [libXfont2]
Dettagli (1)
2.0.7-3.1· x86_64 · tumbleweedSconosciuto · Corretta:
2.0.7-3.1Version impact unknown
dsa · libXfont2 · opensuse · tumbleweed
Osservato:
Riferimenti
- [https://access.redhat.com/errata/RHSA-2026:55448]
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2026_3499-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-44950]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-44950]
- [https://osv.dev/vulnerability/SUSE-SU-2026:23128-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:23151-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:3499-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:3500-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-44950]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:11463-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:21539-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-44950]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2658.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]