Description
libcurl's URL API function
[curl_url_get()](https://curl.se/libcurl/c/curl_url_get.html) offers punycode
conversions, to and from IDN. Asking to convert a name that is exactly 256
bytes, libcurl ends up reading outside of a stack based buffer when built to
use the *macidn* IDN backend. The conversion function then fills up the
provided buffer exactly - but does not null terminate the string.
This flaw can lead to stack contents accidently getting returned as part of
the converted string.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| curl | curl | 8.8.0 – ≤ 8.8.0 | — |
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 | 8.9.0-1 | — |
| Debian 13 | curl | 8.9.0-1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | curl | 8.14.1-150600.4.28.1 | SUSE-SU-2025:03198-1 |
| SLES 15 SP6 | curl | 8.14.1-150600.4.28.1 | SUSE-SU-2025:03198-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | curl | 8.9.0-1.1 | openSUSE-SU-2024:14225-1 |
| openSUSE Leap 15.6 | curl | 8.14.1-150600.4.28.1 | SUSE-SU-2025:03198-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | curl | 8.9.0-r0 | — |
| Alpine v3.23 | curl | 8.9.0-r0 | — |
| Alpine v3.22 | curl | 8.9.0-r0 | — |
| Alpine v3.21 | curl | 8.9.0-r0 | — |
| Alpine v3.20 | curl | 8.9.0-r0 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | curl | 8.9.0-r0 | — |
| Alpine v3.18 | curl | 8.9.0-r0 | — |
| Alpine v3.17 | curl | 8.9.0-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | cmake | 3.30.3-2 | — |
| Azure Linux 3 | curl | 8.8.0-1 | — |
| Azure Linux 2 (CBL-Mariner) | curl | 8.8.0-1 | — |
Advisories 7
- SUSE-SU-2025:03198-1 Security update for curl SUSE / openSUSE Security Updates · Mar 23, 2026
- ICSA-26-043-06 Siemens SINEC OS CISA ICS & IT advisories · Feb 25, 2026
- ICSA-25-226-07 Siemens Third-Party Components in SINEC OS CISA ICS & IT advisories · Feb 25, 2026
- SSA-089022 SSA-089022: Multiple Vulnerabilities in Third-Party Components in SINEC OS before V3.3 Siemens ProductCERT · Feb 24, 2026
- SSA-355557 SSA-355557: Multiple Vulnerabilities in Third-Party Components in SINEC OS before V3.2 Siemens ProductCERT · Feb 24, 2026
- openSUSE-SU-2024:14225-1 curl-8.9.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-1697 cURL: Mehrere Schwachstellen ermöglichen Denial of Service und Offenlegung von Informationen BSI CERT-Bund (WID) · Nov 4, 2025