CVE-2026-5190
AWS C Event Stream Streaming Decoder Stack Buffer Overflow
Out-of-bounds write in the streaming decoder component in aws-c-event-stream before 0.6.0 might allow a third party operating a server to cause memory corruption leading to arbitrary code execution on a client application that processes crafted event-stream messages.
To remediate this issue, users should upgrade to version 0.6.0 or later.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- Passive
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
AWS C Event Stream Streaming Decoder Stack Buffer Overflow
Out-of-bounds write in the streaming decoder component in aws-c-event-stream before 0.6.0 might allow a third party operating a server to cause memory corruption leading to arbitrary code execution on a client application that processes crafted event-stream messages.
To remediate this issue, users should upgrade to version 0.6.0 or later.
- Record
CVE-2026-5190- CVSS 4.0
- 7.7 High
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-787
- Updated
- 2026-11-02
EUVDEUVD-2026-17575
Out-of-bounds write in the streaming decoder component in aws-c-event-stream before 0.6.0 might allow a third party operating a server to cause memory corruption leading to arbitrary code execution on a client application that processes crafted event-stream messages.
To remediate this issue, users should upgrade to version 0.6.0 or later.
- Record
EUVD-2026-17575- CVSS 4.0
- 7.7 High
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - Updated
- 2026-11-02
NVD
Out-of-bounds write in the streaming decoder component in aws-c-event-stream before 0.6.0 might allow a third party operating a server to cause memory corruption leading to arbitrary code execution on a client application that processes crafted event-stream messages.
To remediate this issue, users should upgrade to version 0.6.0 or later.
- Record
CVE-2026-5190- CVSS 4.0
- 7.7 High
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-787
- Updated
- 2026-11-02
OSV
AWS C Event Stream Streaming Decoder Stack Buffer Overflow
Out-of-bounds write in the streaming decoder component in aws-c-event-stream before 0.6.0 might allow a third party operating a server to cause memory corruption leading to arbitrary code execution on a client application that processes crafted event-stream messages.
To remediate this issue, users should upgrade to version 0.6.0 or later.
- Record
CVE-2026-5190- CVSS 4.0
- 7.7 High
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - Weakness
- CWE-787
- Updated
- 2026-11-02
OSVopenSUSE-SU-2026:10512-1 No score
aws-c-event-stream-devel-0.7.0-1.1 on GA media
These are all security issues fixed in the aws-c-event-stream-devel-0.7.0-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2026:10512-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2026:20477-1 No score
Security update for aws-c-event-stream
This update for aws-c-event-stream fixes the following issues:
Changes in aws-c-event-stream:
- CVE-2026-5190: Fixed a out-of-bounds write caused by crafted event-stream messages (bsc#1261298)
- Record
openSUSE-SU-2026:20477-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
aws-c-event-streamopenSUSE:Tumbleweed |
before 0.7.0-1.1 | 0.7.0-1.1 |
aws-c-event-streamopenSUSE:Leap 16.0 |
before 0.4.2-bp160.2.1 | 0.4.2-bp160.2.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-5190 is a high vulnerability (CVSS 7.7) in Aws Aws-c-event-stream, published March 31, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.42%, the 36th percentile. Fixed in aws-c-event-stream 0.7.0-1.1.
References
aws.amazon.com/security/security-bulletins/2026-011-aws
github.com/awslabs/aws-c-event-stream/security/advisories/GHSA-xvjw-fjq5-68hf
nvd.nist.gov/vuln/detail/CVE-2026-5190
suse.com/security/cve/CVE-2026-5190
bugzilla.suse.com/1261298