{"id":"CVE-2026-6324","summary":"Libsoup: libsoup: http request smuggling via unsigned to signed conversion error","details":"A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.","modified":"2026-11-07T19:04:03.650573914Z","published":"2026-05-29T05:24:07.364Z","database_specific":{"cwe_ids":["CWE-444"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6324.json","cna_assigner":"redhat"},"references":[{"type":"WEB","url":"https://access.redhat.com/downloads/content/package-browser/"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-6324"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6324.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6324"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2458479"},{"type":"REPORT","url":"https://gitlab.gnome.org/GNOME/libsoup/-/issues/508"},{"type":"FIX","url":"https://gitlab.gnome.org/GNOME/libsoup/-/commit/96ac392b444d01bd5de1d1276b187c3ed49d048c"},{"type":"EVIDENCE","url":"https://gitlab.gnome.org/GNOME/libsoup/-/work_items/508"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://gitlab.gnome.org/gnome/libsoup","events":[{"introduced":"0"},{"fixed":"96ac392b444d01bd5de1d1276b187c3ed49d048c"}],"database_specific":{"extracted_events":[{"range":[{"fixed":"96ac392b444d01bd5de1d1276b187c3ed49d048c"}],"source":"REFERENCES_COMMIT"}]}}],"versions":["2.72.0","3.6.4","3.6.3","3.6.2","3.6.1","3.4.4","3.6.0","3.5.2","3.5.1","3.4.3","3.4.2","3.4.1","3.4.0","3.3.1","3.3.0","3.2.0","3.1.4","3.1.3","3.1.2","3.1.1","3.0.6","3.0.5","3.0.4","3.0.3","3.0.2","3.0.1","3.0.0","2.99.9","2.99.8","2.99.7","2.99.6","2.99.5","2.99.4","2.99.3","2.99.2","2.99.1","2.71.1","2.71.0","2.70.0","2.69.90","2.68.3","2.68.2","2.68.1","2.68.0","2.67.93","2.67.92","2.67.91","2.67.90","2.67.3","2.67.2","2.67.1","2.66.2","2.66.1","2.66.0","2.65.92","2.65.91","2.65.90","2.65.2","2.65.1","2.64.0","2.63.92","2.63.91","2.63.90","2.63.2","2.63.1","2.62.0","2.61.91","2.61.90","2.61.2","2.61.1","2.60.2","2.60.1","2.60.0","2.59.90.1","2.59.90","2.58.0","2.57.1","2.56.0","2.55.90","2.54.1","2.54.0.1","2.54.0","2.53.92","2.53.90","2.53.2","2.53.1","2.52.1","2.52.0","2.51.92","2.51.90","2.51.3","2.50.0","2.49.92","2.49.91.1","2.49.91","2.49.1","2.48.0","2.47.92","2.47.4","2.47.3","2.46.0","2.45.92","2.45.90","2.45.3","2.44.1","2.44.0","LIBSOUP_2_43_92","2.43.92","LIBSOUP_2_43_90","2.43.90","LIBSOUP_2_43_5","2.43.5","LIBSOUP_2_43_4","2.43.4","LIBSOUP_2_43_2","2.43.2","LIBSOUP_2_43_1","2.43.1","LIBSOUP_2_42_1","2.42.1","LIBSOUP_2_42_0","2.42.0","LIBSOUP_2_41_92","2.41.92","LIBSOUP_2_41_91","2.41.91","LIBSOUP_2_41_90","2.41.90","LIBSOUP_2_41_5","2.41.5","LIBSOUP_2_41_4","2.41.4","LIBSOUP_2_41_3","2.41.3","LIBSOUP_2_41_2","2.41.2","LIBSOUP_2_41_1","2.41.1","LIBSOUP_2_40_1","2.40.1","LIBSOUP_2_40_0","2.40.0","LIBSOUP_2_39_92","LIBSOUP_2_39_91","LIBSOUP_2_39_90","LIBSOUP_2_39_5","LIBSOUP_2_38_1","LIBSOUP_2_39_4_1","LIBSOUP_2_39_4","LIBSOUP_2_39_3","LIBSOUP_2_39_2","LIBSOUP_2_39_1","LIBSOUP_2_38_0","LIBSOUP_2_37_92","LIBSOUP_2_37_91","LIBSOUP_2_37_90","LIBSOUP_2_37_5","LIBSOUP_2_37_4","LIBSOUP_2_37_3","LIBSOUP_2_37_2","LIBSOUP_2_37_1","LIBSOUP_2_36_0","LIBSOUP_2_35_92","LIBSOUP_2_35_90","LIBSOUP_2_35_4","LIBSOUP_2_35_3","LIBSOUP_2_34_1","LIBSOUP_2_34_0","LIBSOUP_2_33_92","LIBSOUP_2_33_90","LIBSOUP_2_33_6","LIBSOUP_2_33_5","LIBSOUP_2_33_4","LIBSOUP_2_32_2","LIBSOUP_2_32_1","LIBSOUP_2_32_0","LIBSOUP_2_31_92","LIBSOUP_2_31_90","LIBSOUP_2_31_6","LIBSOUP_2_30_0","LIBSOUP_2_29_91","LIBSOUP_2_29_90","LIBSOUP_2_29_6","LIBSOUP_2_29_5","LIBSOUP_2_29_3","LIBSOUP_2_28_1","LIBSOUP_2_28_0","LIBSOUP_2_27_92","LIBSOUP_2_27_91","LIBSOUP_2_27_90","LIBSOUP_2_27_5","LIBSOUP_2_27_4","LIBSOUP_2_27_2","LIBSOUP_2_27_1","LIBSOUP_2_26_1","LIBSOUP_2_26_0_9","LIBSOUP_2_26_0","LIBSOUP_2_25_91","LIBSOUP_2_25_5","LIBSOUP_2_25_4","LIBSOUP_2_25_2","LIBSOUP_2_25_1","LIBSOUP_2_24_0","LIBSOUP_2_23_92","LIBSOUP_2_23_91","LIBSOUP_2_23_6","LIBSOUP_2_23_1","LIBSOUP_2_4_1","LIBSOUP_2_4_0","LIBSOUP_2_3_4","LIBSOUP_2_3_2","LIBSOUP_2_3_0_1","LIBSOUP_2_2_103","LIBSOUP_2_2_102","LIBSOUP_2_2_101","SOUP_2_2_100","LIBSOUP_2_2_100","LIBSOUP_2_2_99","LIBSOUP_2_2_98","LIBSOUP_2_2_97","LIBSOUP_2_2_96","LIBSOUP_2_2_95_1","LIBSOUP_2_2_94","LIBSOUP_2_2_93","LIBSOUP_2_2_92","LIBSOUP_2_2_91","LIBSOUP_2_2_90_NOT_A_REAL_RELEASE","gnome-2-12-base","libsoup-pre214-branch-base","LIBSOUP_2_2_6_1","LIBSOUP_2_2_6","LIBSOUP_2_2_5","LIBSOUP_2_2_0","LIBSOUP_2_1_13","LIBSOUP_2_1_12","LIBSOUP_2_1_11","LIBSOUP_2_1_10","LIBSOUP_2_1_9","LIBSOUP_2_1_8","libsoup-hacking-branch-base","LIBSOUP_2_1_7","LIBSOUP_2_1_6","LIBSOUP_2_1_5","LIBSOUP_2_1_4","LIBSOUP_2_1_3","LIBSOUP_2_1_2","libsoup-2-0-branch-base","LIBSOUP_1_99_25","LIBSOUP_1_99_24","LIBSOUP_1_99_23","LIBSOUP_1_99_22","LIBSOUP_1_99_20","LIBSOUP_1_99_19","LIBSOUP_1_99_17","LIBSOUP_1_99_16","LIBSOUP_1_99_15","SOUP_0_6_0","SOUP_0_5","SOUP_0_4","SOUP_0_4_1"],"database_specific":{"vanir_signatures_modified":"2026-11-07T19:04:03Z","source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-6324.json","vanir_signatures":[{"signature_type":"Line","signature_version":"v1","source":"https://gitlab.gnome.org/gnome/libsoup@96ac392b444d01bd5de1d1276b187c3ed49d048c","target":{"file":"libsoup/http1/soup-body-input-stream.c"},"deprecated":false,"digest":{"line_hashes":["5252250336448183672739009544446122612","47907364192080274779293127694122589076","133375317442185969931502807706135985494","175862329446494456582280059914398120035","147605455520277580544852683198114119207","148127108298746976584161470866955906976","263290651267915574195872356137598819245","309683480584065641019334985150789171705","114308541691089153301615615702886226628","236426643327997479000716787083051449967","171653896970795685301778783694829761356","199659700376413812109101037316564262197"],"threshold":0.9},"id":"CVE-2026-6324-32081c07"},{"target":{"file":"tests/server-test.c","function":"do_chunked_test"},"deprecated":false,"digest":{"function_hash":"132694437312584468251031477250602385056","length":1535},"id":"CVE-2026-6324-5c1572d6","signature_type":"Function","signature_version":"v1","source":"https://gitlab.gnome.org/gnome/libsoup@96ac392b444d01bd5de1d1276b187c3ed49d048c"},{"signature_version":"v1","source":"https://gitlab.gnome.org/gnome/libsoup@96ac392b444d01bd5de1d1276b187c3ed49d048c","target":{"function":"soup_body_input_stream_read_chunked","file":"libsoup/http1/soup-body-input-stream.c"},"deprecated":false,"digest":{"function_hash":"7561991653851345159474377235049439384","length":2207},"id":"CVE-2026-6324-75230d3c","signature_type":"Function"},{"source":"https://gitlab.gnome.org/gnome/libsoup@96ac392b444d01bd5de1d1276b187c3ed49d048c","target":{"file":"libsoup/server/http1/soup-server-message-io-http1.c","function":"io_read"},"deprecated":false,"digest":{"function_hash":"258306947550375934262994161502712549635","length":2495},"id":"CVE-2026-6324-90956a0b","signature_type":"Function","signature_version":"v1"},{"source":"https://gitlab.gnome.org/gnome/libsoup@96ac392b444d01bd5de1d1276b187c3ed49d048c","target":{"file":"tests/server-test.c"},"deprecated":false,"digest":{"line_hashes":["45930873717169636658204096979150962525","7312773875022908292158916186978614269","177324389028524764656155744039164079936","250990363521951772794602744394991888894","228654950869699099096376923686403142322","152239663951429721598511844396081711690","106124983809417856846768884766915702304","334793833705893232384300392390203713143","44286936633756529144436884053692968363","278263695436208923970806297840255183528","60242522802375792421295462124568532918","265694861892212701375920462599868092959","282767195940321467425201447042658417431","300341466339101772888927734682256239612","262251369159393039608508543214959927308","125523161000707065044902099259794580791","64009524084699305816039632501165286126","150278585487423823433348357236173414583","334169748174899234780147483640508262912"],"threshold":0.9},"id":"CVE-2026-6324-be0cdcb6","signature_type":"Line","signature_version":"v1"},{"deprecated":false,"digest":{"line_hashes":["423701076298377116416838643283151378","183956312383337804078925514345371204515","89522295186761743914354865874967798199","132005272742906472951300063787773458387","139692967407537773883534435009953556333"],"threshold":0.9},"id":"CVE-2026-6324-c53e0202","signature_type":"Line","signature_version":"v1","source":"https://gitlab.gnome.org/gnome/libsoup@96ac392b444d01bd5de1d1276b187c3ed49d048c","target":{"file":"libsoup/server/http1/soup-server-message-io-http1.c"}}]}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"}]}