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CVE-2026-39821

PUBLISHED 17.09.2026

CNA: Go

Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna

Обновлено: 21.08.2026
The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode("xn--example-.com") incorrectly returns the name "example.com" rather than an error. This behavior can lead to privilege escalation in programs using the idna package. For example, a program which performs privilege checks on the ASCII hostname may reject "example.com" but permit "xn--example-.com". If that program subsequently converts the ASCII hostname to Unicode, it will inadvertently permits access to the Unicode name "example.com".

БДУ ФСТЭК

Идентификатор Описание
BDU:2026-15293 Уязвимость пакета golang-x-net языка программирования Golang, связанная с неправильной проверкой небезопасной эквивалентности входных данных, позволяющая нарушителю обойти существующие ограничения безопасности и выполнить произвольный код

EPSS

Вероятность Severity Процентиль ? Дата расчёта
0.69% LOW 51.23 17.09.2026

Доп. Информация

Product Status

net/http
Product: net/http
Vendor: Go standard library
Default status: unaffected
Версии:
Затронутые версии Статус
Наблюдалось в версиях от 0 до 1.25.13 affected
Наблюдалось в версиях от 1.26.0-0 до 1.26.6 affected
Наблюдалось в версиях от 1.27.0-0 до 1.27.0-rc.3 affected
net/http/internal/http2
Product: net/http/internal/http2
Vendor: Go standard library
Default status: unaffected
Версии:
Затронутые версии Статус
Наблюдалось в версиях от 0 до 1.25.13 affected
Наблюдалось в версиях от 1.26.0-0 до 1.26.6 affected
Наблюдалось в версиях от 1.27.0-0 до 1.27.0-rc.3 affected
golang.org/x/net/idna
Product: golang.org/x/net/idna
Vendor: golang.org/x/net
Default status: unaffected
Версии:
Затронутые версии Статус
Наблюдалось в версиях от 0 до 0.55.0 affected
 

Ссылки

CISA ADP Vulnrichment

Обновлено: 27.05.2026
Этот блок содержит дополнительную информацию, предоставленную программой CVE для этой уязвимости.

CVSS

Оценка Severity Версия Базовый вектор
9.6 CRITICAL 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

SSVC

Exploitation Automatable Technical Impact Версия Дата доступа
none no total 2.0.3 23.05.2026

golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing

Обновлено: 17.09.2026

CVSS

Оценка Severity Версия Базовый вектор
8.2 HIGH 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

Ссылки

https://access.redhat.com/security/cve/CVE-2026-39821
https://bugzilla.redhat.com/show_bug.cgi?id=2480756
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39821.json
https://access.redhat.com/errata/RHSA-2026:42079
https://access.redhat.com/errata/RHSA-2026:42080
https://access.redhat.com/errata/RHSA-2026:41019
https://access.redhat.com/errata/RHSA-2026:66350
https://access.redhat.com/errata/RHSA-2026:54191
https://access.redhat.com/errata/RHSA-2026:42078
https://access.redhat.com/errata/RHSA-2026:54757
https://access.redhat.com/errata/RHSA-2026:54580
https://access.redhat.com/errata/RHSA-2026:34789
https://access.redhat.com/errata/RHSA-2026:42082
https://access.redhat.com/errata/RHSA-2026:36796
https://access.redhat.com/errata/RHSA-2026:57845
https://access.redhat.com/errata/RHSA-2026:62549
https://access.redhat.com/errata/RHSA-2026:65851
https://access.redhat.com/errata/RHSA-2026:42150
https://access.redhat.com/errata/RHSA-2026:42151
https://access.redhat.com/errata/RHSA-2026:42240
https://access.redhat.com/errata/RHSA-2026:67149
https://access.redhat.com/errata/RHSA-2026:49702
https://access.redhat.com/errata/RHSA-2026:67517
https://access.redhat.com/errata/RHSA-2026:56143
https://access.redhat.com/errata/RHSA-2026:59546
https://access.redhat.com/errata/RHSA-2026:53413
https://access.redhat.com/errata/RHSA-2026:63134
https://access.redhat.com/errata/RHSA-2026:53374
https://access.redhat.com/errata/RHSA-2026:51187
https://access.redhat.com/errata/RHSA-2026:30855
https://access.redhat.com/errata/RHSA-2026:46395
https://access.redhat.com/errata/RHSA-2026:37436
https://access.redhat.com/errata/RHSA-2026:35827
https://access.redhat.com/errata/RHSA-2026:35826
https://access.redhat.com/errata/RHSA-2026:65534
https://access.redhat.com/errata/RHSA-2026:34357
https://access.redhat.com/errata/RHSA-2026:66432
https://access.redhat.com/errata/RHSA-2026:39005
https://access.redhat.com/errata/RHSA-2026:39573
https://access.redhat.com/errata/RHSA-2026:38995
https://access.redhat.com/errata/RHSA-2026:30853
https://access.redhat.com/errata/RHSA-2026:35830
https://access.redhat.com/errata/RHSA-2026:35831
https://access.redhat.com/errata/RHSA-2026:66016
https://access.redhat.com/errata/RHSA-2026:41930
https://access.redhat.com/errata/RHSA-2026:68504
https://access.redhat.com/errata/RHSA-2026:67319
https://access.redhat.com/errata/RHSA-2026:61253
https://access.redhat.com/errata/RHSA-2026:67160
https://access.redhat.com/errata/RHSA-2026:65359
https://access.redhat.com/errata/RHSA-2026:61245
https://access.redhat.com/errata/RHSA-2026:60354
https://access.redhat.com/errata/RHSA-2026:57649
https://access.redhat.com/errata/RHSA-2026:67159
https://access.redhat.com/errata/RHSA-2026:59549
https://access.redhat.com/errata/RHSA-2026:53412
https://access.redhat.com/errata/RHSA-2026:59562
https://access.redhat.com/errata/RHSA-2026:60315
https://access.redhat.com/errata/RHSA-2026:67287
https://access.redhat.com/errata/RHSA-2026:49712
https://access.redhat.com/errata/RHSA-2026:51112
https://access.redhat.com/errata/RHSA-2026:56223
https://access.redhat.com/errata/RHSA-2026:52826
https://access.redhat.com/errata/RHSA-2026:53415
https://access.redhat.com/errata/RHSA-2026:57541
https://access.redhat.com/errata/RHSA-2026:54401
https://access.redhat.com/errata/RHSA-2026:30854
https://access.redhat.com/errata/RHSA-2026:37435
https://access.redhat.com/errata/RHSA-2026:35828
https://access.redhat.com/errata/RHSA-2026:35829
https://access.redhat.com/errata/RHSA-2026:65886
https://access.redhat.com/errata/RHSA-2026:34359
https://access.redhat.com/errata/RHSA-2026:65153
https://access.redhat.com/errata/RHSA-2026:39879
https://access.redhat.com/errata/RHSA-2026:54531
https://access.redhat.com/errata/RHSA-2026:34342
https://access.redhat.com/errata/RHSA-2026:36808
https://access.redhat.com/errata/RHSA-2026:34364
https://access.redhat.com/errata/RHSA-2026:56340
https://access.redhat.com/errata/RHSA-2026:47952
https://access.redhat.com/errata/RHSA-2026:50843
https://access.redhat.com/errata/RHSA-2026:41030
https://access.redhat.com/errata/RHSA-2026:44622
https://access.redhat.com/errata/RHSA-2026:47149
https://access.redhat.com/errata/RHSA-2026:53530
https://access.redhat.com/errata/RHSA-2026:51033
https://access.redhat.com/errata/RHSA-2026:66022
https://access.redhat.com/errata/RHSA-2026:43692
https://access.redhat.com/errata/RHSA-2026:60387
https://access.redhat.com/errata/RHSA-2026:30651
https://access.redhat.com/errata/RHSA-2026:47737
https://access.redhat.com/errata/RHSA-2026:26546
https://access.redhat.com/errata/RHSA-2026:26547
https://access.redhat.com/errata/RHSA-2026:36207
https://access.redhat.com/errata/RHSA-2026:42132
https://access.redhat.com/errata/RHSA-2026:42142
https://access.redhat.com/errata/RHSA-2026:36651
https://access.redhat.com/errata/RHSA-2026:40945
https://access.redhat.com/errata/RHSA-2026:40118
https://access.redhat.com/errata/RHSA-2026:33531
https://access.redhat.com/errata/RHSA-2026:33524
https://access.redhat.com/errata/RHSA-2026:23262
https://access.redhat.com/errata/RHSA-2026:23264
https://access.redhat.com/errata/RHSA-2026:54441
https://access.redhat.com/errata/RHSA-2026:41928
https://access.redhat.com/errata/RHSA-2026:50300
https://access.redhat.com/errata/RHSA-2026:43038
https://access.redhat.com/errata/RHSA-2026:42644
https://access.redhat.com/errata/RHSA-2026:65126
https://access.redhat.com/errata/RHSA-2026:60520
https://access.redhat.com/errata/RHSA-2026:36648
https://access.redhat.com/errata/RHSA-2026:41036
https://access.redhat.com/errata/RHSA-2026:36820
https://access.redhat.com/errata/RHSA-2026:35994
https://access.redhat.com/errata/RHSA-2026:35993
https://access.redhat.com/errata/RHSA-2026:33155
https://access.redhat.com/errata/RHSA-2026:33160
https://access.redhat.com/errata/RHSA-2026:33163
https://access.redhat.com/errata/RHSA-2026:33173
https://access.redhat.com/errata/RHSA-2026:33183
https://access.redhat.com/errata/RHSA-2026:54287
https://access.redhat.com/errata/RHSA-2026:54284
https://access.redhat.com/errata/RHSA-2026:54286
https://access.redhat.com/errata/RHSA-2026:54285
https://access.redhat.com/errata/RHSA-2026:54274
https://access.redhat.com/errata/RHSA-2026:54283
https://access.redhat.com/errata/RHSA-2026:44624
https://access.redhat.com/errata/RHSA-2026:56431
https://access.redhat.com/errata/RHSA-2026:37387
https://access.redhat.com/errata/RHSA-2026:41031
https://access.redhat.com/errata/RHSA-2026:42146
https://access.redhat.com/errata/RHSA-2026:43052
https://access.redhat.com/errata/RHSA-2026:42796
https://access.redhat.com/errata/RHSA-2026:41066
https://access.redhat.com/errata/RHSA-2026:54395
https://access.redhat.com/errata/RHSA-2026:40262
https://access.redhat.com/errata/RHSA-2026:51341
https://access.redhat.com/errata/RHSA-2026:51194
https://access.redhat.com/errata/RHSA-2026:36797
https://access.redhat.com/errata/RHSA-2026:42043
https://access.redhat.com/errata/RHSA-2026:42047
https://access.redhat.com/errata/RHSA-2026:42050
https://access.redhat.com/errata/RHSA-2026:42051
https://access.redhat.com/errata/RHSA-2026:42049
https://access.redhat.com/errata/RHSA-2026:42048
https://access.redhat.com/errata/RHSA-2026:42852
https://access.redhat.com/errata/RHSA-2026:54435
https://access.redhat.com/errata/RHSA-2026:57194
https://access.redhat.com/errata/RHSA-2026:36105
https://access.redhat.com/errata/RHSA-2026:36167
https://access.redhat.com/errata/RHSA-2026:41055
https://access.redhat.com/errata/RHSA-2026:47735
https://access.redhat.com/errata/RHSA-2026:30650
https://access.redhat.com/errata/RHSA-2026:36883

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