{"schemaVersion":3,"id":"CVE-2026-4926","aliases":["UBUNTU-CVE-2026-4926","DEBIAN-CVE-2026-4926","CGA-4q33-693v-wwvc","CGA-6cx9-6r2h-v894","CGA-8fvp-759v-r6pw","CGA-8phf-qqc3-wgpv","CGA-f9pr-q292-j9xm","CGA-frf3-gpv2-58xc","CGA-gfgv-hph5-pv23","CGA-h2h5-3cgg-cc39","CGA-h65p-h46v-ww99","CGA-m3v5-qm75-cq8w","CGA-pvw5-p8gh-jcqj","CGA-rf63-f5gr-27rc","CGA-rv9m-rp6x-3fqq","CGA-vm45-5gcp-9f4w","CGA-wffh-xg2p-r4pm","GHSA-j3q9-mxjg-w52f","CGA-22ph-mrcm-cvhc","CGA-2384-qh3w-fw39","CGA-288c-gw2j-vjpw","CGA-32xp-fcf2-3xpx","CGA-33fm-hrc6-8mgv","CGA-3fhp-j8h6-gmp3","CGA-4pw3-9gj3-4m5g","CGA-53c5-2jf2-cwq4","CGA-55wx-m4rc-2m7p","CGA-6vhp-34c2-c2x3","CGA-89h6-r439-9f7h","CGA-8rjc-fhqx-c69v","CGA-8wg9-cx9r-3hmj","CGA-9wpv-f7c3-xp3m","CGA-c889-wfxg-959p","CGA-c9pr-c5g9-727v","CGA-fh48-fpx6-2crg","CGA-g39r-xc2v-7jgx","CGA-g3mr-crjw-2gp2","CGA-h8hg-4963-7m8c","CGA-hm39-mvv8-47fp","CGA-jm97-8557-w268","CGA-jmqc-28r2-cmfx","CGA-m5qc-8rv5-fw2c","CGA-pjxp-4jfr-m447","CGA-q4rx-5cch-8r9h","CGA-qv56-m543-3h2q","CGA-v389-6w23-mh36","CGA-vjv5-v6vw-mq95","CGA-x3h7-pxqj-45v6","CGA-xr3r-63mp-vhqf","CGA-xww8-mr75-fxwc"],"status":"published","duplicateOf":null,"title":null,"description":"Impact:\n\nA bad regular expression is generated any time you have multiple sequential optional groups (curly brace syntax), such as `{a}{b}{c}:z`. The generated regex grows exponentially with the number of groups, causing denial of service.\n\nPatches:\n\nFixed in version 8.4.0.\n\nWorkarounds:\n\nLimit the number of sequential optional groups in route patterns. 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