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CVE-2023-38039

Published: 13 September 2023

When curl retrieves an HTTP response, it stores the incoming headers so that they can be accessed later via the libcurl headers API. However, curl did not have a limit in how many or how large headers it would accept in a response, allowing a malicious server to stream an endless series of headers and eventually cause curl to run out of heap memory.

Notes

AuthorNote
alexmurray
Vulnerable code exists since 7.83.0 but was an experimental
feature not enabled by default and only enabled in 7.84.0. Fixed in
upstream release 8.3.0.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
curl
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
jammy Not vulnerable
(code not present)
lunar
Released (7.88.1-8ubuntu2.2)
mantic
Released (8.2.1-1ubuntu3)
trusty Not vulnerable
(code not present)
upstream Needs triage

xenial Not vulnerable
(code not present)
Patches:
upstream: https://github.com/curl/curl/commit/3ee79c1674fd6f9

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H