{"id":"DEBIAN-CVE-2026-110676","details":"Cpanel::JSON::XS versions before 4.80 for Perl allow memory exhaustion by encoding exponent notation as full decimal digits under allow_bignum.  With allow_bignum, a JSON number with a fraction or exponent decodes to a Math::BigFloat, which stores the exponent separately and so decodes cheaply. Encoding it untyped or as JSON_TYPE_FLOAT writes the plain decimal form with one digit per unit of exponent. Nothing bounds the exponent, so the 12-byte text [1e30000000] encodes to 30 MB.  Untrusted JSON decoded with allow_bignum and encoded again can exhaust memory and CPU.","modified":"2026-10-20T05:00:08.847655739Z","published":"2026-10-19T20:47:38.696709771Z","upstream":["CVE-2026-110676"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-110676"}],"affected":[{"package":{"name":"libcpanel-json-xs-perl","ecosystem":"Debian:12","purl":"pkg:deb/debian/libcpanel-json-xs-perl?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.35-1","4.35-1+deb12u1","4.36-1","4.37-1","4.38-1","4.39-1","4.39-2","4.39-2~deb13u1","4.40-1","4.41-1","4.42-1","4.51-1","4.80-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-110676.json"}},{"package":{"name":"libcpanel-json-xs-perl","ecosystem":"Debian:13","purl":"pkg:deb/debian/libcpanel-json-xs-perl?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.39-1","4.39-2","4.39-2~deb13u1","4.40-1","4.41-1","4.42-1","4.51-1","4.80-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-110676.json"}},{"package":{"name":"libcpanel-json-xs-perl","ecosystem":"Debian:14","purl":"pkg:deb/debian/libcpanel-json-xs-perl?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.39-1","4.39-2","4.39-2~deb13u1","4.40-1","4.41-1","4.42-1","4.51-1","4.80-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-110676.json"}}],"schema_version":"1.9.0"}