Description
libcurl versions from 7.34.0 to before 7.64.0 are vulnerable to a heap out-of-bounds read in the code handling the end-of-response for SMTP. If the buffer passed to `smtp_endofresp()` isn't NUL terminated and contains no character ending the parsed number, and `len` is set to 5, then the `strtol()` call reads beyond the allocated buffer. The read contents will not be returned to the caller.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The curl Project | curl | 7.64.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | curl | 7.64.0-1 | — |
| Debian 13 | curl | 7.64.0-1 | — |
| Debian 12 | curl | 7.64.0-1 | — |
| Debian 9 | curl | 7.52.1-5+deb9u9 | DSA-4386-1 |
| Debian 8 | curl | 7.38.0-4+deb8u14 | DLA-1672-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | curl | 7.58.0-2ubuntu3.6 | USN-3882-1 |
| Ubuntu 16.04 LTS | curl | 7.47.0-1ubuntu2.12 | USN-3882-1 |
| Ubuntu 14.04 LTS | curl | 7.35.0-1ubuntu2.20 | USN-3882-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | curl +3 | 7.61.1-11.el8 | RHSA-2019:3701 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | curl | 7.60.0-3.17.1 | SUSE-SU-2019:0248-1 |
| SLES 12 SP4 | curl | 7.60.0-4.3.1 | SUSE-SU-2019:0339-1 |
| SLES 12 SP3 | curl | 7.37.0-37.34.1 | SUSE-SU-2019:0249-1 |
| SLES 12 SP2 | curl | 7.37.0-37.34.1 | SUSE-SU-2019:0249-1 |
| SLES 12 SP1 | curl | 7.37.0-37.34.1 | SUSE-SU-2019:0249-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | curl | 7.37.0-37.34.1 | SUSE-SU-2019:0249-1 |
| SLES for SAP 12 SP4 | curl | 7.60.0-4.3.1 | SUSE-SU-2019:0339-1 |
| SLES for SAP 12 SP3 | curl | 7.37.0-37.34.1 | SUSE-SU-2019:0249-1 |
| SLES for SAP 12 SP2 | curl | 7.37.0-37.34.1 | SUSE-SU-2019:0249-1 |
| SLES for SAP 12 SP1 | curl | 7.37.0-37.34.1 | SUSE-SU-2019:0249-2 |
| SUSE OpenStack Cloud 7 | curl | 7.37.0-37.34.1 | SUSE-SU-2019:0249-1 |
| SUSE Enterprise Storage 4 | curl | 7.37.0-37.34.1 | SUSE-SU-2019:0249-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | curl | 7.79.1-1.1 | openSUSE-SU-2024:10582-1 |
| openSUSE Leap 15.0 | curl +1 | 7.60.0-lp150.2.18.1 | openSUSE-SU-2019:0174-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | curl | 7.64.0-r0 | — |
| Alpine v3.23 | curl | 7.64.0-r0 | — |
| Alpine v3.22 | curl | 7.64.0-r0 | — |
| Alpine v3.21 | curl | 7.64.0-r0 | — |
| Alpine v3.20 | curl | 7.64.0-r0 | — |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | curl | 7.64.0-r0 | — |
| Alpine v3.18 | curl | 7.64.0-r0 | — |
| Alpine v3.17 | curl | 7.64.0-r0 | — |
| Alpine v3.16 | curl | 7.64.0-r0 | — |
| Alpine v3.15 | curl | 7.64.0-r0 | — |
| Alpine v3.14 | curl | 7.64.0-r0 | — |
| Alpine v3.13 | curl | 7.64.0-r0 | — |
| Alpine v3.12 | curl | 7.64.0-r0 | — |
| Alpine v3.11 | curl | 7.64.0-r0 | — |
| Alpine v3.10 | curl | 7.64.0-r0 | — |
| Alpine v3.9 | curl | 7.64.0-r0 | — |
| Alpine v3.8 | curl | 7.61.1-r2 | — |
| Alpine v3.7 | curl | 7.61.1-r2 | — |
| Alpine v3.6 | curl | 7.61.1-r2 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | curl +2 | 7.61.1-9.amzn2.0.1 | ALAS2-2019-1162 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | curl +3 | 7.61.1-11.el8 | ELSA-2019-3701 |
Advisories 19
- WID-SEC-2026-4026 Red Hat OpenShift: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 18, 2026
- RHSA-2019:3701 Red Hat Security Advisory: curl security and bug fix update Red Hat Security Advisories (RHSA) · Sep 21, 2026
- USN-3882-1 curl vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4386-1 curl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1672-1 curl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10582-1 curl-7.79.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0249-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0339-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:0174-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0249-2 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0248-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2026-0180 Dell Data Protection Advisor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 20, 2026
- WID-SEC-2025-1212 Oracle Communications Applications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 2, 2025
- WID-SEC-2023-1640 cURL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 4, 2025
- SSA-936080 SSA-936080: Multiple Vulnerabilities in Third-Party Component libcurl Siemens ProductCERT · Sep 14, 2021
- ICSA-19-099-04 Siemens SINEMA Remote Connect (Update A) CISA ICS & IT advisories · Mar 9, 2021
- ICSA-21-068-10 Siemens SCALANCE and SIMATIC libcurl (Update B) CISA ICS & IT advisories · Mar 9, 2021
- ELSA-2019-3701 Moderate: curl security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 14, 2019
- ALAS2-2019-1162 Moderate: curl security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 18, 2019
References
- GLSA-201903-03 vendor-advisory
- DSA-4386 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3823
- https://curl.haxx.se/docs/CVE-2019-3823.html
- https://security.netapp.com/advisory/ntap-20190315-0001/
- USN-3882-1 vendor-advisory
- 106950 vdb-entry
- [infra-devnull] 20190404 [GitHub] [incubator-openwhisk-runtime-ballerina] falkzoll commented on issue #15: Update to new base image jdk8u202-b08_openj9-0.12.1. mailing-list
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
- RHSA-2019:3701 vendor-advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-936080.pdf