# DSA-6189-1: libpng1.6 security update

DSA-6189-1, released March 31, 2026, fixes 1 CVE in libpng1.6. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/dsa-6189-1
- Platform: Linux
- Released: Mar 31, 2026
- Priority: High (Closes CVE-2026-33416, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://security-tracker.debian.org/tracker/CVE-2026-33416

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [libpng1.6](https://patchblox.com/security/data/product/linux/libpng1.6.md) | Debian 12.15 (bookworm) | 1.6.39-2+deb12u4 |
| [libpng1.6](https://patchblox.com/security/data/product/linux/libpng1.6.md) | Debian 13.5 (trixie) | 1.6.48-1+deb13u4 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-33416](https://patchblox.com/security/data/cve/CVE-2026-33416.md) | High | LIBPNG has use-after-free via pointer aliasing in `png_set_tRNS` and `png_set_PLTE` | 8.8 | 0.0107 |  |

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Data as of 2026-11-07T06:34:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo