Description
An allocation of resources without limits or throttling vulnerability exists in curl <v7.88.0 based on the "chained" HTTP compression algorithms, meaning that a server response can be compressed multiple times and potentially with differentalgorithms. The number of acceptable "links" in this "decompression chain" wascapped, but the cap was implemented on a per-header basis allowing a maliciousserver to insert a virtually unlimited number of compression steps simply byusing many headers. The use of such a decompression chain could result in a "malloc bomb", making curl end up spending enormous amounts of allocated heap memory, or trying to and returning out of memory errors.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | https://github.com/curl/curl | Fixed in 7.88.0 | — |
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 | 7.88.1-1 | — |
| Debian 13 | curl | 7.88.1-1 | — |
| Debian 12 | curl | 7.88.1-1 | — |
| Debian 11 | curl | 7.74.0-1.3+deb11u7 | DSA-5365-1 |
| Debian 10 | curl | 7.64.0-4+deb10u5 | DLA-3341-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | curl | 7.81.0-1ubuntu1.8 | USN-5891-1 |
| Ubuntu 20.04 LTS | curl | 7.68.0-1ubuntu2.16 | USN-5891-1 |
| Ubuntu 18.04 LTS | curl | 7.58.0-2ubuntu3.23 | USN-5891-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | curl +4 | 7.76.1-19.el9_1.2 | RHSA-2023:1701 |
| RHEL 8 | curl +3 | 7.61.1-25.el8_7.3 | RHSA-2023:1140 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.0 EUS | curl +4 | 7.76.1-14.el9_0.6 | RHSA-2023:4139 |
| RHEL 8.6 EUS | curl +3 | 7.61.1-22.el8_6.6 | RHSA-2023:1842 |
| RHEL 8.4 TUS | curl +3 | 7.61.1-18.el8_4.3 | RHSA-2023:3460 |
| RHEL 8.4 E4S | curl +3 | 7.61.1-18.el8_4.3 | RHSA-2023:3460 |
| RHEL 8.4 AUS | curl +3 | 7.61.1-18.el8_4.3 | RHSA-2023:3460 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-apr-util +8 | 1.6.1-101.el7jbcs | RHSA-2023:3354 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-curl +2 | 8.0.1-1.el7jbcs | RHSA-2023:3354 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-httpd +6 | 2.4.51-39.el7jbcs | RHSA-2023:3354 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-mod_ssl +1 | 1:2.4.51-39.el7jbcs | RHSA-2023:3354 |
| Red Hat JBoss Core Services 1 | jbcs-httpd24-openssl +4 | 1:1.1.1k-14.el7jbcs | RHSA-2023:3354 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | curl +4 | 7.76.1-19.el9_1.2 | ALSA-2023:1701 |
| AlmaLinux 8 | curl +3 | 7.61.1-25.el8_7.3 | ALSA-2023:1140 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | curl | 7.61.1-25.el8_7.3 | RLSA-2023:1140 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | curl | 7.79.1-150400.5.15.1 | SUSE-SU-2023:0429-1 |
| SLES 15 SP1 | curl | 7.60.0-150000.51.1 | SUSE-SU-2023:2226-1 |
| SLES 12 SP5 | curl | 7.60.0-11.55.1 | SUSE-SU-2023:0425-1 |
| SLES 12 SP4 | curl | 7.60.0-4.56.1 | SUSE-SU-2023:2228-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP1 | curl | 7.60.0-150000.51.1 | SUSE-SU-2023:2226-1 |
| SLES for SAP 12 SP5 | curl | 7.60.0-11.55.1 | SUSE-SU-2023:0425-1 |
| SLES for SAP 12 SP4 | curl | 7.60.0-4.56.1 | SUSE-SU-2023:2228-1 |
| SLE Real Time 15 SP3 | curl | 7.66.0-150200.4.52.1 | SUSE-SU-2023:1711-1 |
| SLE Micro 5.3 | curl | 7.79.1-150400.5.15.1 | SUSE-SU-2023:0429-1 |
| SLE Micro 5.2 | curl | 7.66.0-150200.4.52.1 | SUSE-SU-2023:1711-1 |
| SLE Micro 5.1 | curl | 7.66.0-150200.4.52.1 | SUSE-SU-2023:1711-1 |
| SLE HPC 15 SP1 | curl | 7.60.0-150000.51.1 | SUSE-SU-2023:2226-1 |
| SUSE OpenStack Cloud Crowbar 9 | curl | 7.60.0-4.56.1 | SUSE-SU-2023:2228-1 |
| SUSE OpenStack Cloud 9 | curl | 7.60.0-4.56.1 | SUSE-SU-2023:2228-1 |
| SUSE Enterprise Storage 6 | curl | 7.60.0-150000.51.1 | SUSE-SU-2023:2226-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | curl | 7.88.1-1.1 | openSUSE-SU-2024:12735-1 |
| openSUSE Leap 15.4 | curl | 7.79.1-150400.5.15.1 | SUSE-SU-2023:0429-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.3 | curl | 7.79.1-150400.5.15.1 | SUSE-SU-2023:0429-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | curl | 7.88.0-r0 | — |
| Alpine v3.23 | curl | 7.88.0-r0 | — |
| Alpine v3.22 | curl | 7.88.0-r0 | — |
| Alpine v3.21 | curl | 7.88.0-r0 | — |
| Alpine v3.20 | curl | 7.88.0-r0 | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | curl | 7.88.0-r0 | — |
| Alpine v3.18 | curl | 7.88.0-r0 | — |
| Alpine v3.17 | curl | 7.87.0-r2 | — |
| Alpine v3.16 | curl | 7.83.1-r6 | — |
| Alpine v3.15 | curl | 7.80.0-r6 | — |
| Alpine v3.14 | curl | 7.79.1-r5 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | curl +4 | 7.88.0-1.amzn2023.0.1 | ALAS2023-2023-114 |
| Amazon Linux 2 | curl +2 | 7.88.0-1.amzn2.0.1 | ALAS2-2023-1986 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | cmake | 3.28.2-1 | — |
| Azure Linux 3 | tensorflow | 2.16.1-1 | — |
| Azure Linux 2 (CBL-Mariner) | cmake | 3.21.4-13 | — |
| Azure Linux 2 (CBL-Mariner) | curl | 7.88.1-1 | — |
| Azure Linux 2 (CBL-Mariner) | mysql | 8.0.33-1 | — |
| Azure Linux 2 (CBL-Mariner) | rust | 1.72.0-2 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | curl +4 | 7.76.1-19.el9_1.2 | ELSA-2023-1701 |
| Oracle Linux 8 | curl +3 | 7.61.1-25.el8_7.3 | ELSA-2023-1140 |
Advisories 34
- ALSA-2023:1701 Moderate: curl security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:1140 Moderate: curl security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2023:4139 Red Hat Security Advisory: curl security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2023:3460 Red Hat Security Advisory: curl security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2023:3354 Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.51 SP2 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2023:1842 Red Hat Security Advisory: curl security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2023:1701 Red Hat Security Advisory: curl security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2023:1140 Red Hat Security Advisory: curl security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2024-0794 Dell ECS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- WID-SEC-2023-1350 Splunk Splunk Enterprise: Mehrere Schwachstellen in Komponenten von Drittanbietern BSI CERT-Bund (WID) · Jul 1, 2026
- WID-SEC-2023-2917 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 30, 2026
- USN-5891-1 curl vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-5365-1 curl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3341-1 curl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2023:1140 Moderate: curl security update Rocky Linux Security Advisories · Feb 5, 2026
- SUSE-SU-2023:2226-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:0429-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2228-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:1711-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:0425-1 Security update for curl SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-2229 Splunk Splunk Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 18, 2025
- WID-SEC-2023-0405 cURL: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 6, 2025
- WID-SEC-2024-3377 Dell PowerProtect Data Domain: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 12, 2025
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- openSUSE-SU-2024:12735-1 curl-7.88.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- WID-SEC-2023-1614 Tenable Security Nessus Network Monitor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 25, 2023
- WID-SEC-2023-2101 genua genucenter: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 20, 2023
- WID-SEC-2023-1021 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 29, 2023
- ICSA-23-129-02 Hitachi Energy MSM CISA ICS & IT advisories · May 10, 2023
- ELSA-2023-1701 Moderate: curl security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Apr 11, 2023
- ALAS2-2023-1986 Moderate: curl security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Mar 7, 2023
- ELSA-2023-1140 Moderate: curl security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 7, 2023
- ALAS2023-2023-114 Moderate: curl security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 22, 2023
References
- https://hackerone.com/reports/1826048
- [debian-lts-announce] 20230224 [SECURITY] [DLA 3341-1] curl security update mailing-list
- FEDORA-2023-94df30cbec vendor-advisory
- DSA-5365 vendor-advisory
- https://security.netapp.com/advisory/ntap-20230309-0006/
- GLSA-202310-12 vendor-advisory