PT-2026-42116 · Alpaquita+4 · Libpng+2

V2Lixx · Published 2026-05-16 · Updated 2026-06-04 · CVE-2026-40930

Positive Technologies (AI Summary)

CVSS v3.1

5.4

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

Name of the Vulnerable Software and Affected Versions libpng-apng (affected versions not specified)

Description An issue exists in the push-mode APNG parser where chunk smuggling is possible via an unconsumed chunk body. This occurs within the third-party libpng-apng patch.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Weakness Enumeration

CWE-436

Related Identifiers

CVE-2026-40930

Affected Products

Libpng

Libpng-Apng

Libpng1.6

References · 14

• https://osv.dev/vulnerability/ALPINE-CVE-2026-40930 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-40930 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-40930 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-40930 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-40930 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-40930 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-40930 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-40930 · Security Note
• https://github.com/pnggroup/libpng/commit/faf06924688b62d7c1654b5ceddedbde66ffadb4 · Note
• https://github.com/pnggroup/libpng/security/advisories/GHSA-c4v6-gxrq-6g2x · Note
• http://openwall.com/lists/oss-security/2026/05/15/21 · Note
• https://twitter.com/oss_security/status/2056950954977566984 · Twitter Post
• https://docs.bell-sw.com/security/cves/CVE-2026-40930 · Note
• https://security.alpinelinux.org/vuln/CVE-2026-40930 · Note