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CVE-2020-27818

A flaw was found in the check_chunk_name() function of pngcheck-2.4.0. An attacker able to pass a...

3.3 LowPublic exploitFix available

A flaw was found in the check_chunk_name() function of pngcheck-2.4.0. An attacker able to pass a malicious file to be processed by pngcheck could cause a temporary denial of service, posing a low risk to application availability.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
Low

Exploit likelihood

1.22%Down 0.8 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 3.3

A flaw was found in the check_chunk_name() function of pngcheck-2.4.0. An attacker able to pass a malicious file to be processed by pngcheck could cause a temporary denial of service, posing a low risk to application availability.

Record
CVE-2020-27818
CVSS 3.1
3.3 LowCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness
CWE-120, CWE-125
Updated
2026-11-02
CVE List No score

A flaw was found in the check_chunk_name() function of pngcheck-2.4.0. An attacker able to pass a malicious file to be processed by pngcheck could cause a temporary denial of service, posing a low risk to application availability.

Record
CVE-2020-27818
Weakness
CWE-120
Updated
2026-11-02
EUVDEUVD-2020-20319 No score

A flaw was found in the check_chunk_name() function of pngcheck-2.4.0. An attacker able to pass a malicious file to be processed by pngcheck could cause a temporary denial of service, posing a low risk to application availability.

Record
EUVD-2020-20319
Updated
2026-11-03
GitHub AdvisoriesGHSA-xjm9-9gr6-gcpx 3.3

A flaw was found in the check_chunk_name() function of pngcheck-2.4.0. An attacker able to pass a...

A flaw was found in the check_chunk_name() function of pngcheck-2.4.0. An attacker able to pass a malicious file to be processed by pngcheck could cause a temporary denial of service, posing a low risk to application availability.

Record
GHSA-xjm9-9gr6-gcpx
CVSS 3.1
3.3 LowCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Weakness
CWE-120, CWE-125
Updated
2026-11-02
OSV 3.3

A flaw was found in the check_chunk_name() function of pngcheck-2.4.0. An attacker able to pass a malicious file to be processed by pngcheck could cause a temporary denial of service, posing a low risk to application availability.

Record
CVE-2020-27818
CVSS 3.1
3.3 LowCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Updated
2026-11-03
OSVDEBIAN-CVE-2020-27818 3.3

A flaw was found in the check_chunk_name() function of pngcheck-2.4.0. An attacker able to pass a malicious file to be processed by pngcheck could cause a temporary denial of service, posing a low risk to application availability.

Record
DEBIAN-CVE-2020-27818
CVSS 3.1
3.3 LowCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Updated
2026-11-02
Show 7 moreShow less
OSVUBUNTU-CVE-2020-27818 3.3

A flaw was found in the check_chunk_name() function of pngcheck-2.4.0. An attacker able to pass a malicious file to be processed by pngcheck could cause a temporary denial of service, posing a low risk to application availability.

Record
UBUNTU-CVE-2020-27818
CVSS 3.1
3.3 LowCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVopenSUSE-SU-2020:2177-1 No score

Security update for pngcheck

This update for pngcheck fixes the following issues:

  • CVE-2020-27818: Fixed a global buffer overflow in check_chunk_name function via crafted pngfile (boo#1179528).
Record
openSUSE-SU-2020:2177-1
Updated
2026-11-02
OSVopenSUSE-SU-2020:2198-1 No score

Security update for pngcheck

This update for pngcheck fixes the following issues:

  • CVE-2020-27818: Fixed a global buffer overflow in check_chunk_name function via crafted pngfile (boo#1179528).
Record
openSUSE-SU-2020:2198-1
Updated
2026-11-02
OSVopenSUSE-SU-2020:2220-1 No score

Security update for pngcheck

This update for pngcheck fixes the following issues:

  • CVE-2020-27818: Fixed a global buffer overflow in check_chunk_name function via crafted pngfile (boo#1179528).

This update was imported from the openSUSE:Leap:15.2:Update update project.

Record
openSUSE-SU-2020:2220-1
Updated
2026-11-02
OSVopenSUSE-SU-2020:2227-1 No score

Security update for pngcheck

This update for pngcheck fixes the following issues:

  • CVE-2020-27818: Fixed a global buffer overflow in check_chunk_name function via crafted pngfile (boo#1179528).

This update was imported from the openSUSE:Leap:15.1:Update update project.

Record
openSUSE-SU-2020:2227-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11176-1 No score

pngcheck-3.0.0-1.7 on GA media

These are all security issues fixed in the pngcheck-3.0.0-1.7 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11176-1
Updated
2026-11-02
OSVUSN-6182-1 No score

pngcheck vulnerabilities

It was discovered that pngcheck incorrectly handled certain inputs. If a user or an automated system were tricked into opening a specially crafted input file, a remote attacker could possibly use this issue to cause a denial of service.

Record
USN-6182-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
pngcheck
Debian:12
 before 2.3.0-13
2.3.0-13
pngcheck
Debian:13
 before 2.3.0-13
2.3.0-13
pngcheck
Debian:14
 before 2.3.0-13
2.3.0-13
pngcheck
Debian:9
 before 2.3.0-7+deb9u1, plus listed versions
2.3.0-7
2.3.0-7+deb9u1
pngcheck
Ubuntu:Pro:16.04:LTS
 before 2.3.0-7ubuntu0.16.04.1~esm1, plus listed versions
2.3.0-7
2.3.0-7ubuntu0.16.04.1~esm1
pngcheck
Ubuntu:Pro:18.04:LTS
 before 2.3.0-7ubuntu0.18.04.1~esm1, plus listed versions
2.3.0-7
2.3.0-7ubuntu0.18.04.1~esm1
pngcheck
Ubuntu:20.04:LTS
 before 2.3.0-7ubuntu0.20.04.1, plus listed versions
2.3.0-7
2.3.0-7ubuntu0.20.04.1
pngcheck
Ubuntu:24.04:LTS
 All versions, plus listed versions
3.0.3-3
 None known
pngcheck
Ubuntu:25.10
 All versions, plus listed versions
3.0.3-3
 None known
pngcheck
Ubuntu:26.10
 All versions, plus listed versions
4.0.1-1
 None known
Show 9 moreShow less
Affected packages
PackageAffectedFixed
pngcheck
Ubuntu:26.04:LTS
 All versions, plus listed versions
3.0.3-34.0.0+git20250707.6419815-14.0.1-1
 None known
pngcheck
Ubuntu:Pro:16.04:LTS
From an advisory covering 2 CVEs
 before 2.3.0-7ubuntu0.16.04.1~esm1, plus listed versions
2.3.0-7
2.3.0-7ubuntu0.16.04.1~esm1
pngcheck
Ubuntu:Pro:18.04:LTS
From an advisory covering 2 CVEs
 before 2.3.0-7ubuntu0.18.04.1~esm1, plus listed versions
2.3.0-7
2.3.0-7ubuntu0.18.04.1~esm1
pngcheck
Ubuntu:20.04:LTS
From an advisory covering 2 CVEs
 before 2.3.0-7ubuntu0.20.04.1, plus listed versions
2.3.0-7
2.3.0-7ubuntu0.20.04.1
pngcheck
openSUSE:Leap 15.2
 before 2.3.0-lp152.4.3.1
2.3.0-lp152.4.3.1
pngcheck
openSUSE:Leap 15.1
 before 2.3.0-lp151.3.3.1
2.3.0-lp151.3.3.1
pngcheck
SUSE:Package Hub 15 SP2
 before 2.3.0-bp152.4.3.1
2.3.0-bp152.4.3.1
pngcheck
SUSE:Package Hub 15 SP1
 before 2.3.0-bp151.4.3.1
2.3.0-bp151.4.3.1
pngcheck
openSUSE:Tumbleweed
 before 3.0.0-1.7
3.0.0-1.7

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHub13m0n4de/pngcheck-vulns2025-01-19

History

History
RecordedChangedSources
affected, facts
aliasesEUVD, OSV
first indexedCVE List, GitHub Advisories, NVD, OSV, PoC in GitHub

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

In short

CVE-2020-27818 is a low vulnerability (CVSS 3.3) in Libpng Pngcheck, published December 6, 2020. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 1.22%, the 68th percentile. Fixed in pngcheck 2.3.0-13.

References

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