Skip to content
Fencer Vulns
high 7.5

CVE-2023-28319 json

A use after free vulnerability exists in curl <v8.1.0 in the way libcurl offers a feature to verify an SSH server's public key using a SHA…

published 2023-05-26 3 y ago modified 2026-10-23 16 d ago also EUVD-2023-32026 , JLSEC-2026-407

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.5%
EPSS 2.5% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

A use after free vulnerability exists in curl <v8.1.0 in the way libcurl offers a feature to verify an SSH server's public key using a SHA 256 hash. When this check fails, libcurl would free the memory for the fingerprint before it returns an error message containing the (now freed) hash. This flaw risks inserting sensitive heap-based data into the error message that might be shown to users or otherwise get leaked and revealed.

Patch / fix

  • julia CURL_jll 8.5.0+0
  • julia LibCURL_jll 8.2.1+0
  • haxx curl 8.1.0
  • apple macos 11.7.9, 12.6.8, 13.5
  • curl Debian 14, Debian 13, Debian 12 7.88.1-10

debian advisories DEBIAN-CVE-2023-28319

  • jbcs-httpd24-apr jboss core services 1 1.7.0-8.el7jbcs
  • jbcs-httpd24-apr jboss core services 1 1.7.0-8.el8jbcs
  • jbcs-httpd24-curl jboss core services 1 8.2.1-1.el7jbcs
  • jbcs-httpd24-curl jboss core services 1 8.2.1-1.el8jbcs
  • jbcs-httpd24-httpd jboss core services 1 2.4.57-5.el7jbcs
  • jbcs-httpd24-httpd jboss core services 1 2.4.57-5.el8jbcs
  • jbcs-httpd24-libcurl jboss core services 1 8.2.1-1.el7jbcs
  • jbcs-httpd24-libcurl jboss core services 1 8.2.1-1.el8jbcs

red hat advisories RHSA-2023:4629

  • curl SLE Module for Basesystem 15 SP4, SLE Micro 5.4, SLE Micro 5.3 +3 more 8.0.1-150400.5.23.1
  • curl SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 8.0.1-11.65.2

suse advisories SUSE-SU-2023:2224-2SUSE-SU-2023:2225-1SUSE-SU-2023:2224-1

  • curl openSUSE Tumbleweed 8.1.0-1.1

opensuse advisories openSUSE-SU-2024:12940-1

  • curl Alpine 3.24, Alpine 3.23, Alpine 3.22 +7 more 8.1.0-r0

alpine advisories ALPINE-CVE-2023-28319

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • curl CBL-Mariner 2.0 8.2.1-1
  • mysql CBL-Mariner 2.0 8.0.34-1
  • rust CBL-Mariner 2.0 1.72.0-2
  • tensorflow Azure Linux 3.0 2.16.1-1

azure linux advisories AZL-26795AZL-26807AZL-26810AZL-38554

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-28319 updated cvss 5.9

curl: use after free in SSH sha256 fingerprint check

  • Red Hat .NET Core 3.1 on Red Hat Enterprise Linux rh-dotnet31-curl, rh-dotnet31-libcurl
    affected: no fix planned “Out of support scope”
  • Red Hat JBoss Core Services 2.4.57
    fixed: vendor fix RHSA-2023:4628
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-curl 8.2.1-1.el7jbcs, jbcs-httpd24-libcurl 8.2.1-1.el7jbcs Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-curl 8.2.1-1.el8jbcs, jbcs-httpd24-libcurl 8.2.1-1.el8jbcs
    fixed: vendor fix RHSA-2023:4629
  • Red Hat Enterprise Linux 6 curl, libcurl Red Hat Enterprise Linux 7 curl, libcurl Red Hat Enterprise Linux 8 curl, libcurl, libcurl-minimal Red Hat Enterprise Linux 9 curl, libcurl, curl-minimal, libcurl-minimal Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-apr 1.7.0-8.el7jbcs, jbcs-httpd24-httpd 2.4.57-5.el7jbcs, jbcs-httpd24-mod_md 2.4.0-25.el7jbcs, jbcs-httpd24-mod_ssl 2.4.57-5.el7jbcs, jbcs-httpd24-mod_ldap 2.4.57-5.el7jbcs, jbcs-httpd24-apr-util 1.6.1-102.el7jbcs, +17 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-apr 1.7.0-8.el8jbcs, jbcs-httpd24-httpd 2.4.57-5.el8jbcs, jbcs-httpd24-mod_md 2.4.0-25.el8jbcs, jbcs-httpd24-mod_ssl 2.4.57-5.el8jbcs, jbcs-httpd24-mod_ldap 2.4.57-5.el8jbcs, jbcs-httpd24-apr-util 1.6.1-102.el8jbcs, +17 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-24-165-06 updated cvss 7.5

Siemens TIM 1531 IRC

  • Siemens SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0) <V2.4.8 Siemens TIM 1531 IRC (6GK7543-1MX00-0XE0) <V2.4.8
    affected: fixed in V2.4.8 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
21 mo ago

Exploit prediction

2.49% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • hackerone.com https://hackerone.com/reports/1913733 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
julia CURL_jll
<8.5.0+0
8.5.0+0
julia LibCURL_jll
<8.2.1+0
8.2.1+0

Affected products

  • n/a https://github.com/curl/curl

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.