CVE-2019-17266
libsoup through 2.68.1 has a heap-based buffer over-read because soup_ntlm_parse_challenge() in...
libsoup from versions 2.65.1 until 2.68.1 have a heap-based buffer over-read because soup_ntlm_parse_challenge() in soup-auth-ntlm.c does not properly check an NTLM message's length before proceeding with a memcpy.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
libsoup from versions 2.65.1 until 2.68.1 have a heap-based buffer over-read because soup_ntlm_parse_challenge() in soup-auth-ntlm.c does not properly check an NTLM message's length before proceeding with a memcpy.
- Record
CVE-2019-17266- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-125
- Updated
- 2026-11-02
CVE List No score
libsoup from versions 2.65.1 until 2.68.1 have a heap-based buffer over-read because soup_ntlm_parse_challenge() in soup-auth-ntlm.c does not properly check an NTLM message's length before proceeding with a memcpy.
- Record
CVE-2019-17266- Updated
- 2026-11-02
EUVDEUVD-2019-7681 No score
libsoup from versions 2.65.1 until 2.68.1 have a heap-based buffer over-read because soup_ntlm_parse_challenge() in soup-auth-ntlm.c does not properly check an NTLM message's length before proceeding with a memcpy.
- Record
EUVD-2019-7681- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-wcxh-xxc8-v5j8
libsoup through 2.68.1 has a heap-based buffer over-read because soup_ntlm_parse_challenge() in...
libsoup through 2.68.1 has a heap-based buffer over-read because soup_ntlm_parse_challenge() in soup-auth-ntlm.c does not properly check an NTLM message's length before proceeding with a memcpy.
- Record
GHSA-wcxh-xxc8-v5j8- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-125
- Updated
- 2026-11-02
OSVALPINE-CVE-2019-17266
libsoup from versions 2.65.1 until 2.68.1 have a heap-based buffer over-read because soup_ntlm_parse_challenge() in soup-auth-ntlm.c does not properly check an NTLM message's length before proceeding with a memcpy.
- Record
ALPINE-CVE-2019-17266- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
OSV
libsoup from versions 2.65.1 until 2.68.1 have a heap-based buffer over-read because soup_ntlm_parse_challenge() in soup-auth-ntlm.c does not properly check an NTLM message's length before proceeding with a memcpy.
- Record
CVE-2019-17266- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Show 4 moreShow less
OSVDEBIAN-CVE-2019-17266
libsoup from versions 2.65.1 until 2.68.1 have a heap-based buffer over-read because soup_ntlm_parse_challenge() in soup-auth-ntlm.c does not properly check an NTLM message's length before proceeding with a memcpy.
- Record
DEBIAN-CVE-2019-17266- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2019-17266
libsoup from versions 2.65.1 until 2.68.1 have a heap-based buffer over-read because soup_ntlm_parse_challenge() in soup-auth-ntlm.c does not properly check an NTLM message's length before proceeding with a memcpy.
- Record
UBUNTU-CVE-2019-17266- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVMGASA-2019-0312 No score
Updated libsoup packages fix security vulnerability
Updated libsoup package fixes security vulnerability:
It was discovered that libsoup incorrectly handled parsing certain NTLM messages. If a user or automated system were tricked into connecting to a malicious server, a remote attacker could possibly use this issue to cause a denial of service (CVE-2019-17266).
- Record
MGASA-2019-0312- Updated
- 2026-11-02
OSVUSN-4152-1 No score
libsoup2.4 vulnerability
It was discovered that libsoup incorrectly handled parsing certain NTLM messages. If a user or automated system were tricked into connecting to a malicious server, a remote attacker could possibly use this issue to cause a denial of service.
- Record
USN-4152-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
libsoupAlpine:v3.10 |
2.65.1 up to 2.66.2-r2 | 2.66.2-r2 |
libsoupAlpine:v3.11 |
2.65.1 up to 2.68.2-r0 | 2.68.2-r0 |
libsoupAlpine:v3.12 |
2.65.1 up to 2.68.2-r0 | 2.68.2-r0 |
libsoupAlpine:v3.13 |
2.65.1 up to 2.68.2-r0 | 2.68.2-r0 |
libsoupAlpine:v3.14 |
2.65.1 up to 2.68.2-r0 | 2.68.2-r0 |
libsoupAlpine:v3.15 |
2.65.1 up to 2.68.2-r0 | 2.68.2-r0 |
libsoupAlpine:v3.16 |
2.65.1 up to 2.68.2-r0 | 2.68.2-r0 |
libsoupAlpine:v3.17 |
2.65.1 up to 2.68.2-r0 | 2.68.2-r0 |
libsoupAlpine:v3.18 |
2.65.1 up to 2.68.2-r0 | 2.68.2-r0 |
libsoupAlpine:v3.19 |
2.65.1 up to 2.68.2-r0 | 2.68.2-r0 |
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| Package | Affected | Fixed |
|---|---|---|
libsoupAlpine:v3.20 |
2.65.1 up to 2.68.2-r0 | 2.68.2-r0 |
libsoupAlpine:v3.21 |
2.65.1 up to 2.68.2-r0 | 2.68.2-r0 |
libsoupAlpine:v3.22 |
2.65.1 up to 2.68.2-r0 | 2.68.2-r0 |
libsoupAlpine:v3.23 |
2.65.1 up to 2.68.2-r0 | 2.68.2-r0 |
libsoup2.4Debian:12 |
before 2.68.2-1 | 2.68.2-1 |
libsoup2.4Debian:13 |
before 2.68.2-1 | 2.68.2-1 |
libsoupMageia:7 |
before 2.66.1-2.1.mga7 | 2.66.1-2.1.mga7 |
libsoup2.4Ubuntu:18.04:LTS |
before 2.62.1-1ubuntu0.4, plus listed versions 2.60.1-12.60.2-12.60.2-22.60.3-12.61.90-1 Show 4 moreShow less2.62.0-12.62.1-12.62.1-1ubuntu0.12.62.1-1ubuntu0.3 |
2.62.1-1ubuntu0.4 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, aliases, references | OSV | |
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2019-17266 is a critical vulnerability (CVSS 9.8) in Gnome Libsoup, published October 6, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.78%, the 86th percentile. Fixed in libsoup 2.66.2-r2.
References
gitlab.gnome.org/GNOME/libsoup/issues/173
security-tracker.debian.org/tracker/CVE-2019-17266
github.com/Kirin-say/Vulnerabilities/blob/master/CVE-2019-17266_POC.md
bugs.debian.org/cgi-bin/bugreport.cgi?bug=941912
mail-archive.com/debian-bugs-dist%40lists.debian.org/msg1705054.html
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usn.ubuntu.com/4152-1
nvd.nist.gov/vuln/detail/CVE-2019-17266
security.alpinelinux.org/vuln/CVE-2019-17266
advisories.mageia.org/MGASA-2019-0312.html
bugs.mageia.org/show_bug.cgi?id=25642
ubuntu.com/security/CVE-2019-17266
cve.org/CVERecord?id=CVE-2019-17266