CVE-2026-120251
Medium
Description
imagecodecs 2026.3.6 through 2026.10.10 contains an infinite loop vulnerability in ccitt_fax4_decode_size() that allows attackers to hang the calling process by supplying a crafted CCITT Group 4 stream. Attackers can provide an 8-byte G4 stream lacking EOFB to ccittfax4_decode() or the numcodecs Ccittfax4 codec, consuming full CPU until the process is killed.
SeverityMedium
CVSS5.5
Exploit probability—
ProductCgohlke Imagecodecs
PublishedNov 1, 2026
First seenNov 4, 2026
Weakness typeCWE-835CWE-835
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cgohlke imagecodecs | 2026.3.6 ≤ v ≤ 2026.10.10 | — |
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