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CVE-2026-112036

Artifex MuPDF Signature Locking pdf-xref.c free_char_list double free

5.3 Medium

A vulnerability was detected in Artifex MuPDF up to 1.28.5. This impacts the function free_char_list of the file source/pdf/pdf-xref.c of the component Signature Locking. Performing a manipulation results in double free. The attack may be initiated remotely. The exploit is now public and may be used. The patch is named 3984925b660afb8a781ddf504021e91be1bc671e. To fix this issue, it is recommended to deploy a patch.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Passive

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
Low

Exploit likelihood

0.33%Unchanged since Oct 19, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.3

Artifex MuPDF Signature Locking pdf-xref.c free_char_list double free

A vulnerability was detected in Artifex MuPDF up to 1.28.5. This impacts the function free_char_list of the file source/pdf/pdf-xref.c of the component Signature Locking. Performing a manipulation results in double free. The attack may be initiated remotely. The exploit is now public and may be used. The patch is named 3984925b660afb8a781ddf504021e91be1bc671e. To fix this issue, it is recommended to deploy a patch.

Record
CVE-2026-112036
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
CVSS 3.0
4.3 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
CVSS 2.0
5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P/E:POC/RL:OF/RC:C
Weakness
CWE-415, CWE-119
Updated
2026-11-02
EUVDEUVD-2026-104029 5.3

A vulnerability was detected in Artifex MuPDF up to 1.28.5. This impacts the function free_char_list of the file source/pdf/pdf-xref.c of the component Signature Locking. Performing a manipulation results in double free. The attack may be initiated remotely. The exploit is now public and may be used. The patch is named 3984925b660afb8a781ddf504021e91be1bc671e. To fix this issue, it is recommended to deploy a patch.

Record
EUVD-2026-104029
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
Updated
2026-11-02
GitHub AdvisoriesGHSA-pv37-v42r-g3rq 2.1

A vulnerability was detected in Artifex MuPDF up to 1.28.5. This impacts the function...

A vulnerability was detected in Artifex MuPDF up to 1.28.5. This impacts the function free_char_list of the file source/pdf/pdf-xref.c of the component Signature Locking. Performing a manipulation results in double free. The attack may be initiated remotely. The exploit is now public and may be used. The patch is named 3984925b660afb8a781ddf504021e91be1bc671e. To fix this issue, it is recommended to deploy a patch.

Record
GHSA-pv37-v42r-g3rq
CVSS 4.0
2.1 LowCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/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 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Weakness
CWE-119
Updated
2026-11-02
NVD 2.1

A vulnerability was detected in Artifex MuPDF up to 1.28.5. This impacts the function free_char_list of the file source/pdf/pdf-xref.c of the component Signature Locking. Performing a manipulation results in double free. The attack may be initiated remotely. The exploit is now public and may be used. The patch is named 3984925b660afb8a781ddf504021e91be1bc671e. To fix this issue, it is recommended to deploy a patch.

Record
CVE-2026-112036
CVSS 4.0
2.1 LowCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/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 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-119, CWE-415
Updated
2026-11-02
OSVDEBIAN-CVE-2026-112036 2.1

A vulnerability was detected in Artifex MuPDF up to 1.28.5. This impacts the function free_char_list of the file source/pdf/pdf-xref.c of the component Signature Locking. Performing a manipulation results in double free. The attack may be initiated remotely. The exploit is now public and may be used. The patch is named 3984925b660afb8a781ddf504021e91be1bc671e. To fix this issue, it is recommended to deploy a patch.

Record
DEBIAN-CVE-2026-112036
CVSS 4.0
2.1 LowCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/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
OSVUBUNTU-CVE-2026-112036 2.1

A vulnerability was detected in Artifex MuPDF up to 1.28.5. This impacts the function free_char_list of the file source/pdf/pdf-xref.c of the component Signature Locking. Performing a manipulation results in double free. The attack may be initiated remotely. The exploit is now public and may be used. The patch is named 3984925b660afb8a781ddf504021e91be1bc671e. To fix this issue, it is recommended to deploy a patch.

Record
UBUNTU-CVE-2026-112036
CVSS 4.0
2.1 LowCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mupdf
Debian:12
 All versions, plus listed versions
1.21.1+ds2-11.21.1+ds2-1+deb12u11.22.1+ds1-11.22.2+ds1-11.22.2+ds1-2
Show 27 moreShow less
1.23.10+ds1-11.23.10+ds1-21.23.6+ds1-11.23.7+ds1-11.24.10+ds1-11.24.3+ds1-11.24.8+ds2-11.24.8+ds2-21.24.9+ds1-11.25.1+ds1-11.25.1+ds1-21.25.1+ds1-31.25.1+ds1-41.25.1+ds1-51.25.1+ds1-61.25.1+ds1-71.25.1+ds1-81.25.1+ds1-91.27.0+ds1-11.27.0+ds1-21.27.0+ds1-31.27.0+ds1-41.27.0+ds1-51.27.0+ds1-61.28.0+ds1-11.28.2+ds1-11.28.2+ds1-2
 None known
mupdf
Debian:13
 All versions, plus listed versions
1.25.1+ds1-61.25.1+ds1-6+deb13u11.25.1+ds1-71.25.1+ds1-81.25.1+ds1-9
Show 9 moreShow less
1.27.0+ds1-11.27.0+ds1-21.27.0+ds1-31.27.0+ds1-41.27.0+ds1-51.27.0+ds1-61.28.0+ds1-11.28.2+ds1-11.28.2+ds1-2
 None known
mupdf
Debian:14
 All versions, plus listed versions
1.25.1+ds1-61.25.1+ds1-71.25.1+ds1-81.25.1+ds1-91.27.0+ds1-1
Show 8 moreShow less
1.27.0+ds1-21.27.0+ds1-31.27.0+ds1-41.27.0+ds1-51.27.0+ds1-61.28.0+ds1-11.28.2+ds1-11.28.2+ds1-2
 None known
mupdf
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
1.7-11.7a-11.7a-1ubuntu0.1~esm1
 None known
mupdf
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
1.11+ds1-1.11.11+ds1-21.12.0+ds1-11.12.0+ds1-1ubuntu0.1~esm11.12.0+ds1-1ubuntu0.1~esm2
 None known
mupdf
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
1.15.0+ds1-11.16.1+ds1-1ubuntu11.16.1+ds1-1ubuntu1+esm11.16.1+ds1-1ubuntu1+esm2
 None known
mupdf
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
1.17.0+ds1-21.19.0+ds1-11.19.0+ds1-1build11.19.0+ds1-21.19.0+ds1-2ubuntu0.1~esm1
 None known
mupdf
Ubuntu:Pro:24.04:LTS
 All versions, plus listed versions
1.22.2+ds1-21.22.2+ds1-2build11.23.6+ds1-11.23.7+ds1-11.23.10+ds1-1
Show 4 moreShow less
1.23.10+ds1-1build11.23.10+ds1-1build21.23.10+ds1-1build31.23.10+ds1-1ubuntu0.1~esm1
 None known
mupdf
Ubuntu:26.10
 All versions, plus listed versions
1.27.0+ds1-3ubuntu21.27.0+ds1-3ubuntu3
 None known
mupdf
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.25.1+ds1-71.25.1+ds1-7build11.25.1+ds1-7build21.27.0+ds1-2ubuntu11.27.0+ds1-3ubuntu11.27.0+ds1-3ubuntu2
 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-2026-112036 is a medium vulnerability (CVSS 5.3) in Artifex Mupdf, published October 19, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.33%, the 26th percentile. No source names a fixed version.

References

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