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Fencer Vulns
high 7.8

CVE-2020-35511 json

A global buffer overflow was discovered in pngcheck function in pngcheck-2.4.0(5 patches applied) via a crafted png file.

published 2022-08-23 4 y ago modified 2026-06-17 4 mo ago also EUVD-2020-23178

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits
0
none known

Summary

A global buffer overflow was discovered in pngcheck function in pngcheck-2.4.0(5 patches applied) via a crafted png file.

Patch / fix

  • pngcheck Debian 14, Debian 13, Debian 12 3.0.2-2

debian advisories DEBIAN-CVE-2020-35511

  • pngcheck Ubuntu 20.04 LTS 2.3.0-7ubuntu0.20.04.1
  • pngcheck Ubuntu Pro 16.04 LTS 2.3.0-7ubuntu0.16.04.1~esm1
  • pngcheck Ubuntu Pro 18.04 LTS 2.3.0-7ubuntu0.18.04.1~esm1

ubuntu advisories UBUNTU-CVE-2020-35511

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • pngcheck Package Hub 15 SP3, openSUSE Leap 15.3 3.0.3-bp153.3.3.1

opensuse advisories openSUSE-SU-2022:10142-1

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-2020-35511 updated cvss 6.1

pngcheck: global-buffer-overflow in pngcheck() in pngcheck.c

  • Red Hat All currently supported Red Hat products
    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

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • n/a pngcheck

Classification

Weakness
  • CWE-126 Buffer Over-read
  • 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.