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CVE-2026-62294

Flameshot: OCTOU symlink attack via predictable /tmp path in Flameshot "Open With"

5.1 MediumFix available

Flameshot is powerful yet simple to use screenshot software. Prior to 14.0.0, the Open With feature wrote screenshots to a predictable temporary path and followed symlinks, creating a time-of-check to time-of-use race that allowed a local unprivileged attacker on the same machine to pre-plant a symlink and cause Flameshot to write PNG data through it, overwriting any file the victim user could write. This issue is fixed in version 14.0.0.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
Low

Exploit likelihood

0.14%Unchanged since Jul 16, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.1

Flameshot: OCTOU symlink attack via predictable /tmp path in Flameshot "Open With"

Flameshot is powerful yet simple to use screenshot software. Prior to 14.0.0, the Open With feature wrote screenshots to a predictable temporary path and followed symlinks, creating a time-of-check to time-of-use race that allowed a local unprivileged attacker on the same machine to pre-plant a symlink and cause Flameshot to write PNG data through it, overwriting any file the victim user could write. This issue is fixed in version 14.0.0.

Record
CVE-2026-62294
CVSS 4.0
5.1 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-362, CWE-377
Updated
2026-11-02
EUVDEUVD-2026-44675 5.1

Flameshot is powerful yet simple to use screenshot software. Prior to 14.0.0, the Open With feature wrote screenshots to a predictable temporary path and followed symlinks, creating a time-of-check to time-of-use race that allowed a local unprivileged attacker on the same machine to pre-plant a symlink and cause Flameshot to write PNG data through it, overwriting any file the victim user could write. This issue is fixed in version 14.0.0.

Record
EUVD-2026-44675
CVSS 4.0
5.1 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Updated
2026-11-02
NVD 5.1

Flameshot is powerful yet simple to use screenshot software. Prior to 14.0.0, the Open With feature wrote screenshots to a predictable temporary path and followed symlinks, creating a time-of-check to time-of-use race that allowed a local unprivileged attacker on the same machine to pre-plant a symlink and cause Flameshot to write PNG data through it, overwriting any file the victim user could write. This issue is fixed in version 14.0.0.

Record
CVE-2026-62294
CVSS 4.0
5.1 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/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
Weakness
CWE-362, CWE-377
Updated
2026-11-02
OSV 5.1

Flameshot: OCTOU symlink attack via predictable /tmp path in Flameshot "Open With"

Flameshot is powerful yet simple to use screenshot software. Prior to 14.0.0, the Open With feature wrote screenshots to a predictable temporary path and followed symlinks, creating a time-of-check to time-of-use race that allowed a local unprivileged attacker on the same machine to pre-plant a symlink and cause Flameshot to write PNG data through it, overwriting any file the victim user could write. This issue is fixed in version 14.0.0.

Record
CVE-2026-62294
CVSS 4.0
5.1 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-362, CWE-377
Updated
2026-11-02
OSVDEBIAN-CVE-2026-62294 5.1

Flameshot is powerful yet simple to use screenshot software. Prior to 14.0.0, the Open With feature wrote screenshots to a predictable temporary path and followed symlinks, creating a time-of-check to time-of-use race that allowed a local unprivileged attacker on the same machine to pre-plant a symlink and cause Flameshot to write PNG data through it, overwriting any file the victim user could write. This issue is fixed in version 14.0.0.

Record
DEBIAN-CVE-2026-62294
CVSS 4.0
5.1 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/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
OSVUBUNTU-CVE-2026-62294 5.1

Flameshot is powerful yet simple to use screenshot software. Prior to 14.0.0, the Open With feature wrote screenshots to a predictable temporary path and followed symlinks, creating a time-of-check to time-of-use race that allowed a local unprivileged attacker on the same machine to pre-plant a symlink and cause Flameshot to write PNG data through it, overwriting any file the victim user could write. This issue is fixed in version 14.0.0.

Record
UBUNTU-CVE-2026-62294
CVSS 4.0
5.1 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
flameshot
Debian:12
All versions, plus listed versions
12.1.0+ds-112.1.0+ds-212.1.0+ds-312.1.0+ds-412.1.0-2
Show 11 moreShow less
12.1.0-313.3.0+git20251204-113.3.0+git20251204-1~bpo13+113.3.0+git20251204-213.3.0-113.3.0-1~bpo13+113.3.0-214.0.0-114.0.0-214.0.0-314.0.0-4
None known
flameshot
Debian:13
All versions, plus listed versions
12.1.0+ds-212.1.0+ds-312.1.0+ds-413.3.0+git20251204-113.3.0+git20251204-1~bpo13+1
Show 8 moreShow less
13.3.0+git20251204-213.3.0-113.3.0-1~bpo13+113.3.0-214.0.0-114.0.0-214.0.0-314.0.0-4
None known
flameshot
Debian:14
before 14.0.0-1, plus listed versions
12.1.0+ds-212.1.0+ds-312.1.0+ds-413.3.0+git20251204-113.3.0+git20251204-1~bpo13+1
Show 4 moreShow less
13.3.0+git20251204-213.3.0-113.3.0-1~bpo13+113.3.0-2
14.0.0-1
flameshot
Ubuntu:18.04:LTS
All versions, plus listed versions
0.5.0+git20180114-10.5.0+git20180222-10.5.1-10.5.1-2
None known
flameshot
Ubuntu:20.04:LTS
All versions, plus listed versions
0.6.0+git20190714-10.6.0+git20191001-10.6.0+git20191001-2
None known
flameshot
Ubuntu:22.04:LTS
All versions, plus listed versions
0.9.0+ds1-20.10.1+ds1-10.10.2+ds1-10.10.2+ds1-20.10.2+ds1-311.0~rc1+ds1-111.0~rc1+ds1-211.0.0-2
None known
flameshot
Ubuntu:24.04:LTS
All versions, plus listed versions
12.1.0-212.1.0-2build112.1.0-2build2
None known
flameshot
Ubuntu:26.04:LTS
All versions, plus listed versions
12.1.0+ds-212.1.0+ds-312.1.0+ds-413.3.0-113.3.0-213.3.0+git20251204-1
None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, NVD, OSV

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

In short

CVE-2026-62294 is a medium vulnerability (CVSS 5.1) in Flameshot-org Flameshot, published July 15, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.14%, the 3rd percentile. Fixed in flameshot 14.0.0-1.

References

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