Skip to content
Fencer Vulns
medium 5.3

CVE-2026-3713 json

pnggroup libpng pnm2png pnm2png.c do_pnm2png heap-based overflow

published 2026-03-08 8 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-10219

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

A flaw has been found in pnggroup libpng up to 1.6.55. Affected by this vulnerability is the function do_pnm2png of the file contrib/pngminus/pnm2png.c of the component pnm2png. This manipulation of the argument width/height causes heap-based buffer overflow. The attack is restricted to local execution. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Patch / fix

  • libpng hummingbird 1 1.6.56-1.hum1
  • libpng-tools hummingbird 1 1.6.56-1.hum1

red hat advisories RHSA-2026:6732

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-3713 updated cvss 5.3

libpng: libpng: Heap-based buffer overflow in pnm2png allows information disclosure and denial of service

  • Red Hat Hardened Images libpng 1.6.56-1.hum1, libpng-tools 1.6.56-1.hum1
    fixed: vendor fix RHSA-2026:6732
  • Red Hat build of OpenJDK 1.8 java-1.8.0-openjdk-portable Red Hat build of OpenJDK 11 ELS java-11-openjdk, java-11-openjdk-portable Red Hat build of OpenJDK 17 java-17-openjdk-portable Red Hat build of OpenJDK 21 java-21-openjdk-portable Red Hat build of OpenJDK 25 java-25-openjdk-portable Red Hat Enterprise Linux 6 libpng
    +5 more products
    Red Hat Enterprise Linux 7 libpng, libpng12 Red Hat Enterprise Linux 8 libpng, firefox, libpng12, libpng15, thunderbird, mingw-libpng, +65 more Red Hat Enterprise Linux 9 libpng, firefox, libpng15, firefox-x11, thunderbird, java-17-openjdk, +84 more Red Hat Enterprise Linux 10 libpng, firefox, thunderbird, java-21-openjdk, java-25-openjdk Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/biniamf/pocs/tree/main/pnm2png referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 4.8 CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
CNA 3.1 5.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C
CNA 3.0 5.3 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C
CNA 2.0 4.3 AV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:C
CNA 4.0 1.9 CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/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
CNA 3.1 5.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CNA 2.0 4.3 AV:L/AC:L/Au:S/C:P/I:P/A:P

Affected products

  • pnggroup libpng

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.