Description
LIBPNG is a reference library for use in applications that process PNG (Portable Network Graphics) raster image files. In version 1.8.0, three inter-frame chunk discard paths in the push-mode APNG parser clear the chunk-header flag without consuming the chunk body and CRC, allowing attacker-controlled bytes inside an ignored ancillary chunk to be reinterpreted as a fresh chunk header on the next call to `png_process_data`. Commit faf06924688b62d7c1654b5ceddedbde66ffadb4 fixes the issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| pnggroup | libpng | = 1.8.0 | — |
| pnggroup | libpng-apng | >= 1.6.49, <= 1.6.57 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libpng1.6 | 1.6.37-4 | — |
| Debian 13 | libpng1.6 | 1.6.37-4 | — |
| Debian 12 | libpng1.6 | 1.6.37-4 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | libpng1.6 | 1.6.37-3ubuntu0.6 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | libpng1.6 | 1.6.37-2ubuntu0.1~esm3 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | libpng +3 | 1.6.58-1.hum1 | RHSA-2026:20356 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libpng | 1.6.58-r1 | — |
| Alpine v3.23 | libpng | 1.6.58-r1 | — |
| Alpine v3.22 | libpng | 1.6.59-r0 | — |
| Alpine v3.21 | libpng | 1.6.59-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 140.11.0-1.amzn2023.0.1 | ALAS2023-2026-1793 |
| Amazon Linux 2 | thunderbird | 140.11.1-1.amzn2.0.2 | ALAS2-2026-3340 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | fltk +4 | No fix yet | — |
Advisories 4
- RHSA-2026:20356 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- WID-SEC-2026-1559 libpng: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Aug 17, 2026
- ALAS2-2026-3340 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jun 8, 2026
- ALAS2023-2026-1793 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 8, 2026