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CVE-2026-109831

UnRTF by GNU Project is vulnerable to out-of-bounds write. If a user opens an RTF file crafted by...

5.1 MediumFix available

UnRTF by GNU Project is vulnerable to out-of-bounds write. If a user opens an RTF file crafted by an attacker, it may lead to a denial-of-service (DoS) condition.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Active

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
Low

Exploit likelihood

0.21%Unchanged since Oct 20, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.1

UnRTF by GNU Project is vulnerable to out-of-bounds write. If a user opens an RTF file crafted by an attacker, it may lead to a denial-of-service (DoS) condition.

Record
CVE-2026-109831
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
CVSS 3.0
5.4 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Weakness
CWE-787
Updated
2026-11-02
EUVDEUVD-2026-104795 5.1

UnRTF by GNU Project is vulnerable to out-of-bounds write. If a user opens an RTF file crafted by an attacker, it may lead to a denial-of-service (DoS) condition.

Record
EUVD-2026-104795
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-q9jg-8mw4-m3mw 5.1

UnRTF by GNU Project is vulnerable to out-of-bounds write. If a user opens an RTF file crafted by...

UnRTF by GNU Project is vulnerable to out-of-bounds write. If a user opens an RTF file crafted by an attacker, it may lead to a denial-of-service (DoS) condition.

Record
GHSA-q9jg-8mw4-m3mw
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/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
CVSS 3.0
5.4 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Weakness
CWE-787
Updated
2026-11-02
NVD 5.1

UnRTF by GNU Project is vulnerable to out-of-bounds write. If a user opens an RTF file crafted by an attacker, it may lead to a denial-of-service (DoS) condition.

Record
CVE-2026-109831
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/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
CVSS 3.0
5.4 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Weakness
CWE-787
Updated
2026-11-02
OSVDEBIAN-CVE-2026-109831 5.1

UnRTF by GNU Project is vulnerable to out-of-bounds write. If a user opens an RTF file crafted by an attacker, it may lead to a denial-of-service (DoS) condition.

Record
DEBIAN-CVE-2026-109831
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/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
Updated
2026-11-02
OSVOESA-2026-4535 5.4

unrtf security update

UnRTF is a command-line program written in C which converts documents in Rich Text Format (.rtf) to HTML, LaTeX, troff macros, and RTF itself. Converting to HTML, it supports a number of features of Rich Text Format: * Changes in the text's font, size, weight (bold), and slant (italic) * Underlines and strikethroughs * Partial support for text shadowing, outlining, embossing, or engraving * Capitalizations * Superscripts and subscripts * Expanded and condensed text * Changes in the foreground and background colors * Conversion of special characters to HTML entities

Security Fix(es):

UnRTF by GNU Project is vulnerable to out-of-bounds write. If a user opens an RTF file crafted by an attacker, it may lead to a denial-of-service (DoS) condition.(CVE-2026-109831)

Record
OESA-2026-4535
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Updated
2026-11-02
Show 4 moreShow less
OSVOESA-2026-4536 5.4

unrtf security update

UnRTF is a command-line program written in C which converts documents in Rich Text Format (.rtf) to HTML, LaTeX, troff macros, and RTF itself. Converting to HTML, it supports a number of features of Rich Text Format: * Changes in the text's font, size, weight (bold), and slant (italic) * Underlines and strikethroughs * Partial support for text shadowing, outlining, embossing, or engraving * Capitalizations * Superscripts and subscripts * Expanded and condensed text * Changes in the foreground and background colors * Conversion of special characters to HTML entities

Security Fix(es):

UnRTF by GNU Project is vulnerable to out-of-bounds write. If a user opens an RTF file crafted by an attacker, it may lead to a denial-of-service (DoS) condition.(CVE-2026-109831)

Record
OESA-2026-4536
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Updated
2026-11-02
OSVOESA-2026-4537 5.4

unrtf security update

UnRTF is a command-line program written in C which converts documents in Rich Text Format (.rtf) to HTML, LaTeX, troff macros, and RTF itself. Converting to HTML, it supports a number of features of Rich Text Format: * Changes in the text's font, size, weight (bold), and slant (italic) * Underlines and strikethroughs * Partial support for text shadowing, outlining, embossing, or engraving * Capitalizations * Superscripts and subscripts * Expanded and condensed text * Changes in the foreground and background colors * Conversion of special characters to HTML entities

Security Fix(es):

UnRTF by GNU Project is vulnerable to out-of-bounds write. If a user opens an RTF file crafted by an attacker, it may lead to a denial-of-service (DoS) condition.(CVE-2026-109831)

Record
OESA-2026-4537
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Updated
2026-11-02
OSVOESA-2026-4538 5.4

unrtf security update

UnRTF is a command-line program written in C which converts documents in Rich Text Format (.rtf) to HTML, LaTeX, troff macros, and RTF itself. Converting to HTML, it supports a number of features of Rich Text Format: * Changes in the text's font, size, weight (bold), and slant (italic) * Underlines and strikethroughs * Partial support for text shadowing, outlining, embossing, or engraving * Capitalizations * Superscripts and subscripts * Expanded and condensed text * Changes in the foreground and background colors * Conversion of special characters to HTML entities

Security Fix(es):

UnRTF by GNU Project is vulnerable to out-of-bounds write. If a user opens an RTF file crafted by an attacker, it may lead to a denial-of-service (DoS) condition.(CVE-2026-109831)

Record
OESA-2026-4538
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2026-109831 5.1

UnRTF by GNU Project is vulnerable to out-of-bounds write. If a user opens an RTF file crafted by an attacker, it may lead to a denial-of-service (DoS) condition.

Record
UBUNTU-CVE-2026-109831
CVSS 4.0
5.1 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
CVSS 3.0
5.4 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
unrtf
Debian:12
 All versions, plus listed versions
0.21.10-clean-10.21.10-clean-20.21.13-1
 None known
unrtf
Debian:13
 All versions, plus listed versions
0.21.10-clean-10.21.10-clean-20.21.13-1
 None known
unrtf
Debian:14
 before 0.21.13-1, plus listed versions
0.21.10-clean-10.21.10-clean-2
0.21.13-1
unrtf
openEuler:22.03-LTS-SP4
 before 0.21.13-1.oe2203sp4
0.21.13-1.oe2203sp4
unrtf
openEuler:24.03-LTS-SP1
 before 0.21.13-1.oe2403sp1
0.21.13-1.oe2403sp1
unrtf
openEuler:24.03-LTS-SP3
 before 0.21.13-1.oe2403sp3
0.21.13-1.oe2403sp3
unrtf
openEuler:24.03-LTS-SP4
 before 0.21.13-1.oe2403sp4
0.21.13-1.oe2403sp4
unrtf
Ubuntu:16.04:LTS
 All versions, plus listed versions
0.21.5-30.21.9-clean-20.21.9-clean-3~build0.16.04.1
 None known
unrtf
Ubuntu:18.04:LTS
 All versions, plus listed versions
0.21.9-clean-3
 None known
unrtf
Ubuntu:20.04:LTS
 All versions, plus listed versions
0.21.10-clean-1
 None known
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Affected packages
PackageAffectedFixed
unrtf
Ubuntu:22.04:LTS
 All versions, plus listed versions
0.21.10-clean-1
 None known
unrtf
Ubuntu:24.04:LTS
 All versions, plus listed versions
0.21.10-clean-1
 None known
unrtf
Ubuntu:26.10
 All versions, plus listed versions
0.21.10-clean-2build1
 None known
unrtf
Ubuntu:26.04:LTS
 All versions, plus listed versions
0.21.10-clean-20.21.10-clean-2build1
 None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-109831 is a medium vulnerability (CVSS 5.1) in Gnu Project Unrtf, published October 20, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.21%, the 10th percentile. Fixed in unrtf 0.21.13-1.

References

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