What is CVE-2026-54627?

CVE-2026-54627 is a critical-severity vulnerability in Happyseafox Sail, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-09-17.

How severe is CVE-2026-54627?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Happyseafox Sail

CVE-2026-54627

SAIL is a cross-platform library for loading and saving images with support for animation, metadata, and ICC profiles. In 0.9.10 and earlier, psd_private_sail_pixel_format() in src/sail-codecs/psd/helpers.c resolves a one-channel PSD in Bitmap color mode to SAIL_PIXEL_FORMAT_BPP1_INDEXED without requiring the file depth to be one, so the pixel buffer uses one-bit rows while sail_codec_load_frame_v8_psd() in src/sail-codecs/psd/psd.c accepts depth == 8 and writes one attacker-controlled byte per pixel. Loading a crafted PSD through sail_load_from_file() or sail_load_from_memory() therefore writes beyond each heap row, causing memory corruption, a reliable crash, or potential code execution. This mode/depth mismatch is distinct from GHSA-rcqx-gc76-r9mv and GHSA-wcj8-hxxf-pq2c. This issue is fixed in version 1.0.0.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Happyseafox Sail — versions < 1.0.0

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-54627?: CVE-2026-54627 is a critical-severity vulnerability in Happyseafox Sail, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-09-17.
How severe is CVE-2026-54627?: Critical severity. CVSS v3 base score is 9.8 out of 10.