Description
libcurl's ASN1 parser has this utf8asn1str() function used for parsing an ASN.1 UTF-8 string. Itcan detect an invalid field and return error. Unfortunately, when doing so it also invokes `free()` on a 4 byte localstack buffer. Most modern malloc implementations detect this error and immediately abort. Some however accept the input pointer and add that memory to its list of available chunks. This leads to the overwriting of nearby stack memory. The content of the overwrite is decided by the `free()` implementation; likely to be memory pointers and a set of flags. The most likely outcome of exploting this flaw is a crash, although it cannot be ruled out that more serious results can be had in special circumstances.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| curl | curl | 8.8.0 – ≤ 8.8.0, 8.7.1 – ≤ 8.7.1, 8.7.0 – ≤ 8.7.0, 8.6.0 – ≤ 8.6.0 | — |
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 SP6 | curl | 8.6.0-150600.4.3.1 | SUSE-SU-2024:2784-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 6.0 | curl | 8.6.0-3.1 | SUSE-SU-2025:20029-1 |
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 | 8.6.0-150600.4.3.1 | SUSE-SU-2024:2784-1 |
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 | 8.8.0-2 | — |
| Azure Linux 2 (CBL-Mariner) | curl | 8.8.0-2 | — |
Advisories 10
- SUSE-SU-2025:20029-1 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
- SUSE-SU-2024:2784-1 Security update for curl 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
- WID-SEC-2024-3121 Microsoft Windows: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 22, 2024
- NCSC-2024-0392 Kwetsbaarheden verholpen in Microsoft Windows NCSC-NL (Netherlands) · Oct 8, 2024